blocks|key|1726606|text|要获得布局指南之间的高度，只需执行以下操作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1726607|let+guide+=+view.safeAreaLayoutGuide
let+height+=+guide.layoutFrame.size.height|code-block|syntax|javascript|1726608|所以full+frame+height+=+812.0，safe+area+height+=+734.0|offset|length|style|CODE|1726609|下面是绿色视图具有guide.layoutFrame框架的示例|1726610|​|1726611|📷|atomic|1726612|1726613|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/0f7a33f3e1ac3dfa409cb6493d83b969.png|imageAlt^0|0|0|2|P|S|O|0|9|H|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|15|8|@$I|16|J|17|K|L]|$I|18|J|19|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|1A|8|@$I|1B|J|1C|K|L]]|9|@]|A|$]]|$1|O|3|P|5|6|7|1D|8|@]|9|@]|A|$]]|$1|Q|3|R|5|S|7|1E|8|@]|9|@$I|1F|J|1G|1|1H]]|A|$]]|$1|T|3|P|5|6|7|1I|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11|12|-4]]]]

To get the height between the layout guides you just do

<pre><code>let guide = view.safeAreaLayoutGuide
let height = guide.layoutFrame.size.height
</code></pre>

So <code>full frame height = 812.0</code>, <code>safe area height = 734.0</code>

Below is the example where the green view has frame of <code>guide.layoutFrame</code>

<a href="https://i.stack.imgur.com/oe5xe.png" rel="noreferrer"><img src="https://i.stack.imgur.com/oe5xe.png" alt="enter image description here"></a>

blocks|key|2395050|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2395051|在中目标C|offset|length|style|BOLD|2395052|if+(@available(iOS+11.0,+*))+{
++++UIWindow+*window+=+UIApplication.sharedApplication.windows.firstObject;
++++CGFloat+topPadding+=+window.safeAreaInsets.top;
++++CGFloat+bottomPadding+=+window.safeAreaInsets.bottom;
}|code-block|syntax|javascript|2395053|在Swift中|2395054|if+#available(iOS+11.0,+*)+{
++++let+window+=+UIApplication.shared.keyWindow
++++let+topPadding+=+window?.safeAreaInsets.top
++++let+bottomPadding+=+window?.safeAreaInsets.bottom
}|2395055|在Swift+-+iOS+13.0及以上|2395056|//将windows数组中的第一个元素用作KeyWindow|2395057|if+#available(iOS+13.0,+*)+{
++++let+window+=+UIApplication.shared.windows.first
++++let+topPadding+=+window.safeAreaInsets.top
++++let+bottomPadding+=+window.safeAreaInsets.bottom
}|2395058|entityMap^0|0|1|4|0|0|1|5|0|0|1|J|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|12|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|13|8|@$D|14|E|15|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|16|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|17|8|@$D|18|E|19|F|G]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1A|8|@]|9|@]|A|$]]|$1|U|3|V|5|J|7|1B|8|@]|9|@]|A|$K|L]]|$1|W|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|X|$]]

Try this :
In Objective C
<pre><code>if (@available(iOS 11.0, *)) {
 UIWindow *window = UIApplication.sharedApplication.windows.firstObject;
 CGFloat topPadding = window.safeAreaInsets.top;
 CGFloat bottomPadding = window.safeAreaInsets.bottom;
}
</code></pre>
In Swift
<pre><code>if #available(iOS 11.0, *) {
 let window = UIApplication.shared.keyWindow
 let topPadding = window?.safeAreaInsets.top
 let bottomPadding = window?.safeAreaInsets.bottom
}
</code></pre>
In Swift - iOS 13.0 and above
// Use the first element from windows array as KeyWindow deprecated
<pre><code>if #available(iOS 13.0, *) {
 let window = UIApplication.shared.windows.first
 let topPadding = window.safeAreaInsets.top
 let bottomPadding = window.safeAreaInsets.bottom
}
</code></pre>

blocks|key|3175231|text|Swift+4，5|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3175232|使用约束将视图固定到安全区域锚点可以在视图控制器的生命周期中的任何位置执行，因为它们由API排队，并在视图加载到内存后处理。然而，获取安全区域值需要等待视图控制器生命周期的结束，比如viewDidLayoutSubviews()。|CODE|3175233|此插件插入任何视图控制器：|3175234|override+func+viewDidLayoutSubviews()+{
++++super.viewDidLayoutSubviews()
++++let+topSafeArea:+CGFloat
++++let+bottomSafeArea:+CGFloat

++++if+#available(iOS+11.0,+*)+{
++++++++topSafeArea+=+view.safeAreaInsets.top
++++++++bottomSafeArea+=+view.safeAreaInsets.bottom
++++}+else+{
++++++++topSafeArea+=+topLayoutGuide.length
++++++++bottomSafeArea+=+bottomLayoutGuide.length
++++}

++++//+safe+area+values+are+now+available+to+use
}|code-block|syntax|javascript|3175235|我更喜欢这种方法，而不是将其从窗口中删除(如果可能的话)，因为API就是这样设计的，更重要的是，在所有视图更改期间都会更新这些值，比如设备方向的更改。|3175236|但是，一些自定义呈现的视图控制器不能使用上述方法(我怀疑是因为它们处于瞬态容器视图中)。在这种情况下，您可以从根视图控制器中获取值，在当前视图控制器生命周期的任何地方都可以使用根视图控制器。|3175237|anyLifecycleMethod()
++++guard+let+root+=+UIApplication.shared.keyWindow?.rootViewController+else+{
++++++++return
++++}
++++let+topSafeArea:+CGFloat
++++let+bottomSafeArea:+CGFloat

++++if+#available(iOS+11.0,+*)+{
++++++++topSafeArea+=+root.view.safeAreaInsets.top
++++++++bottomSafeArea+=+root.view.safeAreaInsets.bottom
++++}+else+{
++++++++topSafeArea+=+root.topLayoutGuide.length
++++++++bottomSafeArea+=+root.bottomLayoutGuide.length
++++}

++++//+safe+area+values+are+now+available+to+use
}|3175238|entityMap^0|0|9|0|2J|N|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|10|8|@$9|11|A|12|B|H]]|D|@]|E|$]]|$1|I|3|J|5|6|7|13|8|@]|D|@]|E|$]]|$1|K|3|L|5|M|7|14|8|@]|D|@]|E|$N|O]]|$1|P|3|Q|5|6|7|15|8|@]|D|@]|E|$]]|$1|R|3|S|5|6|7|16|8|@]|D|@]|E|$]]|$1|T|3|U|5|M|7|17|8|@]|D|@]|E|$N|O]]|$1|V|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|W|$]]

Swift 4, 5

To pin a view to a safe area anchor using constraints can be done anywhere in the view controller's lifecycle because they're queued by the API and handled after the view has been loaded into memory. However, getting safe-area values requires waiting toward the end of a view controller's lifecycle, like <code>viewDidLayoutSubviews()</code>.

This plugs into any view controller:

<pre><code>override func viewDidLayoutSubviews() {
 super.viewDidLayoutSubviews()
 let topSafeArea: CGFloat
 let bottomSafeArea: CGFloat

 if #available(iOS 11.0, *) {
 topSafeArea = view.safeAreaInsets.top
 bottomSafeArea = view.safeAreaInsets.bottom
 } else {
 topSafeArea = topLayoutGuide.length
 bottomSafeArea = bottomLayoutGuide.length
 }

 // safe area values are now available to use
}
</code></pre>

I prefer this method to getting it off of the window (when possible) because it’s how the API was designed and, more importantly, the values are updated during all view changes, like device orientation changes.

However, some custom presented view controllers cannot use the above method (I suspect because they are in transient container views). In such cases, you can get the values off of the root view controller, which will always be available anywhere in the current view controller's lifecycle.

<pre><code>anyLifecycleMethod()
 guard let root = UIApplication.shared.keyWindow?.rootViewController else {
 return
 }
 let topSafeArea: CGFloat
 let bottomSafeArea: CGFloat

 if #available(iOS 11.0, *) {
 topSafeArea = root.view.safeAreaInsets.top
 bottomSafeArea = root.view.safeAreaInsets.bottom
 } else {
 topSafeArea = root.topLayoutGuide.length
 bottomSafeArea = root.bottomLayoutGuide.length
 }

 // safe area values are now available to use
}
</code></pre>

blocks|key|2395133|text|我正在使用CocoaPods框架，万一UIApplication.shared是不可用的，那么我在视图的window中使用safeAreaInsets|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|BOLD|entityRanges|data|2395134|if+#available(iOS+11.0,+*)+{
++++let+insets+=+view.window?.safeAreaInsets
++++let+top+=+insets.top
++++let+bottom+=+insets.bottom
}|code-block|syntax|javascript|2395135|entityMap^0|J|K|1G|6|1P|E|14|4|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|D]]|E|@]|F|$]]|$1|G|3|H|5|I|7|W|8|@]|E|@]|F|$J|K]]|$1|L|3|-4|5|6|7|X|8|@]|E|@]|F|$]]]|M|$]]

I'm working with CocoaPods frameworks and in case <code>UIApplication.shared</code> is unavailable then I use <code>safeAreaInsets</code> in view's <code>window</code>:

<pre><code>if #available(iOS 11.0, *) {
 let insets = view.window?.safeAreaInsets
 let top = insets.top
 let bottom = insets.bottom
}
</code></pre>

blocks|key|2395163|text|这里的其他答案对我都没有用，但这个确实有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2395164|var+topSafeAreaHeight:+CGFloat+=+0
var+bottomSafeAreaHeight:+CGFloat+=+0

++if+#available(iOS+11.0,+*)+{
++++let+window+=+UIApplication.shared.windows[0]
++++let+safeFrame+=+window.safeAreaLayoutGuide.layoutFrame
++++topSafeAreaHeight+=+safeFrame.minY
++++bottomSafeAreaHeight+=+window.frame.maxY+-+safeFrame.maxY
++}|code-block|syntax|javascript|2395165|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

None of the other answers here worked for me, but this did. 

<pre><code>var topSafeAreaHeight: CGFloat = 0
var bottomSafeAreaHeight: CGFloat = 0

 if #available(iOS 11.0, *) {
 let window = UIApplication.shared.windows[0]
 let safeFrame = window.safeAreaLayoutGuide.layoutFrame
 topSafeAreaHeight = safeFrame.minY
 bottomSafeAreaHeight = window.frame.maxY - safeFrame.maxY
 }
</code></pre>

blocks|key|1726735|text|目标-C，当keyWindow等于nil时出现了问题。只需将上面的代码放在viewDidAppear中(而不是viewDidLoad中)|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1726736|entityMap^0|0|4|6|9|H|3|11|D|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|G|$]]

Objective-C
Who had the problem when keyWindow is equal to nil.
Just put the code above in viewDidAppear (not in viewDidLoad)

blocks|key|2395217|text|safeAreaLayoutGuide当视图在屏幕上可见时，本指南反映视图中未被导航条、选项卡条、工具栏和其他祖先视图覆盖的部分。(在tvOS中，安全区反映没有覆盖屏幕边框的区域。)如果视图当前未安装在视图层次结构中，或尚未在屏幕上显示，则布局指南边缘与视图边缘相等。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2395218|然后在截图中得到红色箭头的高度，它是：|2395219|self.safeAreaLayoutGuide.layoutFrame.size.height|code-block|syntax|javascript|2395220|entityMap^0|0|J|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

safeAreaLayoutGuide
When the view is visible onscreen, this guide reflects the portion of the view that is not covered by navigation bars, tab bars, toolbars, and other ancestor views. (In tvOS, the safe area reflects the area not covered the screen's bezel.) If the view is not currently installed in a view hierarchy, or is not yet visible onscreen, the layout guide edges are equal to the edges of the view.

Then to get the height of the red arrow in the screenshot it's:

<pre><code>self.safeAreaLayoutGuide.layoutFrame.size.height
</code></pre>

blocks|key|3175334|text|UIWindow+*window+=+[[[UIApplication+sharedApplication]+delegate]+window];+
CGFloat+fBottomPadding+=+window.safeAreaInsets.bottom;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3175335|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>UIWindow *window = [[[UIApplication sharedApplication] delegate] window]; 
CGFloat fBottomPadding = window.safeAreaInsets.bottom;
</code></pre>

blocks|key|3175372|text|在iOS+11中，有一种方法可以告诉safeArea何时发生了更改。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3175373|override+func+viewSafeAreaInsetsDidChange()+{
++++super.viewSafeAreaInsetsDidChange()
++++let+top+=+view.safeAreaInsets.top
++++let+bottom+=+view.safeAreaInsets.bottom
}|code-block|syntax|javascript|3175374|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In iOS 11 there is a method that tells when the safeArea has changed.

<pre><code>override func viewSafeAreaInsetsDidChange() {
 super.viewSafeAreaInsetsDidChange()
 let top = view.safeAreaInsets.top
 let bottom = view.safeAreaInsets.bottom
}
</code></pre>

blocks|key|1726897|text|这里的所有答案都是有帮助的，感谢每一个提供帮助的人。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1726898|然而，正如我所看到的，这个安全区域的话题有点混乱，这似乎并没有得到很好的记录。|1726899|因此，我将在这里尽可能地总结它，以便更容易地理解safeAreaInsets、safeAreaLayoutGuide和LayoutGuide。|offset|length|style|CODE|1726900|在iOS+7中，苹果在UIViewController中引入了topLayoutGuide和bottomLayoutGuide属性，它们允许您创建约束，以防止内容被状态、导航或选项卡栏等UIKit栏隐藏--使用这些布局指南可以指定内容上的约束，避免其被顶部或底部导航元素(UIKit栏、状态栏、导航条或选项卡栏…)隐藏。。|1726901|因此，例如，如果您想要使一个tableView从顶部屏幕开始，您已经做了这样的事情：|1726902|self.tableView.contentInset+=+UIEdgeInsets(top:+-self.topLayoutGuide.length,+left:+0,+bottom:+0,+right:+0)|code-block|syntax|javascript|1726903|In+iOS+11苹果已经不再推荐这些属性，取而代之的是一个单一的安全区布局指南|BOLD|1726904|苹果的安全区域|1726905|安全区可以帮助您将视图放置在整个界面的可见部分中。UIKit定义的视图控制器可以将特殊视图放置在内容的顶部。例如，导航控制器在底层视图控制器的内容之上显示导航条。即使这些视图是部分透明的，它们仍然屏蔽了它们下面的内容。在tvOS中，安全区域还包括屏幕的过扫描接口，表示屏幕边框覆盖的区域。|blockquote|1726906|下面是iPhone+8和iPhone+X系列中突出显示的安全区域：|1726907|​|1726908|📷|atomic|1726909|1726910|safeAreaLayoutGuide是UIView的一个属性。|1726911|获取safeAreaLayoutGuide的高度|1726912|extension+UIView+{
+++var+safeAreaHeight:+CGFloat+{
+++++++if+#available(iOS+11,+*)+{
++++++++return+safeAreaLayoutGuide.layoutFrame.size.height
+++++++}
+++++++return+bounds.height
++}
}|1726913|它将返回图片中箭头的高度。|1726914|那么，如何获得顶级和下主屏幕指示器的高度呢？|1726915|这里我们将使用safeAreaInsets|1726916|视图的安全区域反映了导航条、选项卡条、工具栏和其他祖先忽略视图控制器视图的区域。(在tvOS中，安全区反映屏幕边框没有覆盖的区域。)通过将此属性中的嵌入应用到视图的边界矩形中，可以获得视图的安全区域。如果视图当前未安装在视图层次结构中，或尚未在屏幕上显示，则此属性中的边缘嵌入为0。|1726917|下面将显示iPhone+8和iPhone+X-系列之一的不安全区域和边缘的距离。|1726918|1726919|1726920|1726921|1726922|1726923|1726924|现在，如果导航栏添加了|1726925|1726926|1726927|1726928|1726929|1726930|1726931|那么，现在如何获得不安全区域的高度呢？我们将使用safeAreaInset|1726932|以下是解决办法，不管它们在一件重要的事情上有什么不同，|1726933|第一个：|1726934|self.view.safeAreaInsets|1726935|它将返回EdgeInsets，您现在可以访问顶部和底部来了解嵌入式，|1726936|第二个：|1726937|UIApplication.shared.windows.first{$0.isKeyWindow+}?.safeAreaInsets|1726938|第一个是视图内嵌，所以如果有导航条，它将被考虑，但是第二个，您正在访问窗口的safeAreaInsets，这样导航条就不会被考虑|1726939|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/ffe99827c4df194c9e5c57bed4a11a72.png|imageAlt|1|https://developer.qcloudimg.com/http-save/yehe-900000/0b69730b60a1648f80e028ff99b36f50.jpg|2|https://developer.qcloudimg.com/http-save/yehe-900000/7f6367c6b8691fbcd5a9c7be47bb79dd.jpg|3|https://developer.qcloudimg.com/http-save/yehe-900000/938763cdc39536716c20583b81691064.jpg|4|https://developer.qcloudimg.com/http-save/yehe-900000/a84c11f3b097bfc38a3b3389ff914aa9.jpg^0|0|0|O|E|13|J|1N|B|0|B|G|V|E|1A|H|0|0|0|0|14|0|0|0|0|0|0|1|0|0|0|0|J|K|6|0|2|J|0|0|0|0|7|E|0|0|0|0|0|1|1|0|0|0|0|1|2|0|0|0|0|0|1|3|0|0|0|0|1|4|0|0|O|D|0|0|0|4|0|0|0|0|4|0|0|0^^$0|@$1|2|3|4|5|6|7|2Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|30|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|31|8|@$F|32|G|33|H|I]|$F|34|G|35|H|I]|$F|36|G|37|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|38|8|@$F|39|G|3A|H|I]|$F|3B|G|3C|H|I]|$F|3D|G|3E|H|I]]|9|@]|A|$]]|$1|L|3|M|5|6|7|3F|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|3G|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|6|7|3H|8|@$F|3I|G|3J|H|U]]|9|@]|A|$]]|$1|V|3|W|5|6|7|3K|8|@]|9|@]|A|$]]|$1|X|3|Y|5|Z|7|3L|8|@]|9|@]|A|$]]|$1|10|3|11|5|6|7|3M|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|3N|8|@]|9|@]|A|$]]|$1|14|3|15|5|16|7|3O|8|@]|9|@$F|3P|G|3Q|1|3R]]|A|$]]|$1|17|3|13|5|6|7|3S|8|@]|9|@]|A|$]]|$1|18|3|19|5|6|7|3T|8|@$F|3U|G|3V|H|I]|$F|3W|G|3X|H|I]]|9|@]|A|$]]|$1|1A|3|1B|5|6|7|3Y|8|@$F|3Z|G|40|H|I]]|9|@]|A|$]]|$1|1C|3|1D|5|P|7|41|8|@]|9|@]|A|$Q|R]]|$1|1E|3|1F|5|6|7|42|8|@]|9|@]|A|$]]|$1|1G|3|1H|5|6|7|43|8|@]|9|@]|A|$]]|$1|1I|3|1J|5|6|7|44|8|@$F|45|G|46|H|I]]|9|@]|A|$]]|$1|1K|3|1L|5|Z|7|47|8|@]|9|@]|A|$]]|$1|1M|3|1N|5|6|7|48|8|@]|9|@]|A|$]]|$1|1O|3|13|5|6|7|49|8|@]|9|@]|A|$]]|$1|1P|3|15|5|16|7|4A|8|@]|9|@$F|4B|G|4C|1|4D]]|A|$]]|$1|1Q|3|13|5|6|7|4E|8|@]|9|@]|A|$]]|$1|1R|3|13|5|6|7|4F|8|@]|9|@]|A|$]]|$1|1S|3|15|5|16|7|4G|8|@]|9|@$F|4H|G|4I|1|4J]]|A|$]]|$1|1T|3|13|5|6|7|4K|8|@]|9|@]|A|$]]|$1|1U|3|1V|5|6|7|4L|8|@]|9|@]|A|$]]|$1|1W|3|13|5|6|7|4M|8|@]|9|@]|A|$]]|$1|1X|3|15|5|16|7|4N|8|@]|9|@$F|4O|G|4P|1|4Q]]|A|$]]|$1|1Y|3|13|5|6|7|4R|8|@]|9|@]|A|$]]|$1|1Z|3|13|5|6|7|4S|8|@]|9|@]|A|$]]|$1|20|3|15|5|16|7|4T|8|@]|9|@$F|4U|G|4V|1|4W]]|A|$]]|$1|21|3|13|5|6|7|4X|8|@]|9|@]|A|$]]|$1|22|3|23|5|6|7|4Y|8|@$F|4Z|G|50|H|I]]|9|@]|A|$]]|$1|24|3|25|5|6|7|51|8|@]|9|@]|A|$]]|$1|26|3|27|5|6|7|52|8|@$F|53|G|54|H|U]]|9|@]|A|$]]|$1|28|3|29|5|P|7|55|8|@]|9|@]|A|$Q|R]]|$1|2A|3|2B|5|6|7|56|8|@]|9|@]|A|$]]|$1|2C|3|2D|5|6|7|57|8|@$F|58|G|59|H|U]]|9|@]|A|$]]|$1|2E|3|2F|5|P|7|5A|8|@]|9|@]|A|$Q|R]]|$1|2G|3|2H|5|6|7|5B|8|@]|9|@]|A|$]]|$1|2I|3|-4|5|6|7|5C|8|@]|9|@]|A|$]]]|2J|$2K|$5|2L|2M|2N|A|$2O|2P|2Q|-4]]|2R|$5|2L|2M|2N|A|$2O|2S|2Q|-4]]|2T|$5|2L|2M|2N|A|$2O|2U|2Q|-4]]|2V|$5|2L|2M|2N|A|$2O|2W|2Q|-4]]|2X|$5|2L|2M|2N|A|$2O|2Y|2Q|-4]]]]

All of the answers here are helpful, Thanks to everyone who offered help.
However as i see that that the safe area topic is a little bit confused which won’t appear to be well documented.
So i will summarize it here as mush as possible to make it easy to understand <code>safeAreaInsets</code>, <code>safeAreaLayoutGuide</code> and <code>LayoutGuide</code>.
In iOS 7, Apple introduced the <code>topLayoutGuide</code> and <code>bottomLayoutGuide</code> properties in <code>UIViewController</code>,
They allowed you to create constraints to keep your content from being hidden by UIKit bars like the status, navigation or tab bar
It was possible with these layout guides to specify constraints on content,
avoiding it to be hidden by top or bottom navigation elements (UIKit bars, status bar, nav or tab bar…).
So for example if you wanna make a tableView starts from the top screen you have done something like that:
<pre><code>self.tableView.contentInset = UIEdgeInsets(top: -self.topLayoutGuide.length, left: 0, bottom: 0, right: 0)
</code></pre>
In iOS 11 Apple has deprecated these properties replacing them with a single safe area layout guide
Safe area according to Apple
<blockquote>
Safe areas help you place your views within the visible portion of the overall interface. UIKit-defined view controllers may position special views on top of your content. For example, a navigation controller displays a navigation bar on top of the underlying view controller’s content. Even when such views are partially transparent, they still occlude the content that is underneath them. In tvOS, the safe area also includes the screen’s overscan insets, which represent the area covered by the screen’s bezel.
</blockquote>
Below, a safe area highlighted in iPhone 8 and iPhone X-series:
<a href="https://i.stack.imgur.com/VRzXq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/VRzXq.png" alt="enter image description here" /></a>
The <code>safeAreaLayoutGuide</code> is a property of <code>UIView</code>
To get the height of <code>safeAreaLayoutGuide</code>:
<pre><code>extension UIView {
 var safeAreaHeight: CGFloat {
 if #available(iOS 11, *) {
 return safeAreaLayoutGuide.layoutFrame.size.height
 }
 return bounds.height
 }
}
</code></pre>
That will return the height of the Arrow in your picture.
Now, what about getting the top &quot;notch&quot; and bottom home screen indicator heights?
Here we will use the <code>safeAreaInsets</code>
<blockquote>
The safe area of a view reflects the area not covered by navigation bars, tab bars, toolbars, and other ancestors that obscure a view controller's view. (In tvOS, the safe area reflects the area not covered by the screen's bezel.) You obtain the safe area for a view by applying the insets in this property to the view's bounds rectangle. If the view is not currently installed in a view hierarchy, or is not yet visible onscreen, the edge insets in this property are 0.
</blockquote>
The following will show the unsafe area and there distance from edges on iPhone 8 and one of iPhone X-Series.
<a href="https://i.stack.imgur.com/pRXS0l.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pRXS0l.png" alt="enter image description here" /></a>
<a href="https://i.stack.imgur.com/GwfzVl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GwfzVl.png" alt="enter image description here" /></a>
Now, if navigation bar added
<a href="https://i.stack.imgur.com/9XljAl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9XljAl.png" alt="enter image description here" /></a>
<a href="https://i.stack.imgur.com/B4kDXl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/B4kDXl.png" alt="enter image description here" /></a>
So, now how to get the unsafe area height? we will use the <code>safeAreaInset</code>
Here are to solutions however they differ in an important thing,
First One:
<pre><code>self.view.safeAreaInsets
</code></pre>
That will return the EdgeInsets, you can now access the top and the bottom to know the insets,
Second One:
<pre><code>UIApplication.shared.windows.first{$0.isKeyWindow }?.safeAreaInsets
</code></pre>
The first one you are taking the view insets, so if there a navigation bar it will be considered , however the second one you are accessing the window's safeAreaInsets so the navigation bar will not be considered

blocks|key|1726973|text|更全面的方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1726974|++import+SnapKit

++let+containerView+=+UIView()
++containerView.backgroundColor+=+.red
++self.view.addSubview(containerView)
++containerView.snp.remakeConstraints+{+(make)+->+Void+in
++++++++make.width.top.equalToSuperView()
++++++++make.top.equalTo(self.view.safeArea.top)
++++++++make.bottom.equalTo(self.view.safeArea.bottom)
++}




extension+UIView+{
++++var+safeArea:+ConstraintBasicAttributesDSL+{
++++++++if+#available(iOS+11.0,+*)+{
++++++++++++return+self.safeAreaLayoutGuide.snp
++++++++}
++++++++return+self.snp
++++}


++++var+isIphoneX:+Bool+{

++++++++if+#available(iOS+11.0,+*)+{
++++++++++++if+topSafeAreaInset+>+CGFloat(0)+{
++++++++++++++++return+true
++++++++++++}+else+{
++++++++++++++++return+false
++++++++++++}
++++++++}+else+{
++++++++++++return+false
++++++++}

++++}

++++var+topSafeAreaInset:+CGFloat+{
++++++++let+window+=+UIApplication.shared.keyWindow
++++++++var+topPadding:+CGFloat+=+0
++++++++if+#available(iOS+11.0,+*)+{
++++++++++++topPadding+=+window?.safeAreaInsets.top+??+0
++++++++}

++++++++return+topPadding
++++}

++++var+bottomSafeAreaInset:+CGFloat+{
++++++++let+window+=+UIApplication.shared.keyWindow
++++++++var+bottomPadding:+CGFloat+=+0
++++++++if+#available(iOS+11.0,+*)+{
++++++++++++bottomPadding+=+window?.safeAreaInsets.bottom+??+0
++++++++}

++++++++return+bottomPadding
++++}
}|code-block|syntax|javascript|1726975|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

A more rounded approach 

<pre><code> import SnapKit

 let containerView = UIView()
 containerView.backgroundColor = .red
 self.view.addSubview(containerView)
 containerView.snp.remakeConstraints { (make) -&gt; Void in
 make.width.top.equalToSuperView()
 make.top.equalTo(self.view.safeArea.top)
 make.bottom.equalTo(self.view.safeArea.bottom)
 }




extension UIView {
 var safeArea: ConstraintBasicAttributesDSL {
 if #available(iOS 11.0, *) {
 return self.safeAreaLayoutGuide.snp
 }
 return self.snp
 }


 var isIphoneX: Bool {

 if #available(iOS 11.0, *) {
 if topSafeAreaInset &gt; CGFloat(0) {
 return true
 } else {
 return false
 }
 } else {
 return false
 }

 }

 var topSafeAreaInset: CGFloat {
 let window = UIApplication.shared.keyWindow
 var topPadding: CGFloat = 0
 if #available(iOS 11.0, *) {
 topPadding = window?.safeAreaInsets.top ?? 0
 }

 return topPadding
 }

 var bottomSafeAreaInset: CGFloat {
 let window = UIApplication.shared.keyWindow
 var bottomPadding: CGFloat = 0
 if #available(iOS 11.0, *) {
 bottomPadding = window?.safeAreaInsets.bottom ?? 0
 }

 return bottomPadding
 }
}
</code></pre>

blocks|key|2395391|text|Swift+5，Xcode+11.4|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2395392|`UIApplication.shared.keyWindow`+|code-block|syntax|javascript|2395393|它会发出反对警告。‘keyWindow’在iOS+13.0中被废弃:不应该用于支持多个场景的应用程序，因为它会返回所有连接场景的键窗口“，因为连接了场景。我用这种方式。|2395394|extension+UIView+{

++++var+safeAreaBottom:+CGFloat+{
+++++++++if+#available(iOS+11,+*)+{
++++++++++++if+let+window+=+UIApplication.shared.keyWindowInConnectedScenes+{
++++++++++++++++return+window.safeAreaInsets.bottom
++++++++++++}
+++++++++}
+++++++++return+0
++++}

++++var+safeAreaTop:+CGFloat+{
+++++++++if+#available(iOS+11,+*)+{
++++++++++++if+let+window+=+UIApplication.shared.keyWindowInConnectedScenes+{
++++++++++++++++return+window.safeAreaInsets.top
++++++++++++}
+++++++++}
+++++++++return+0
++++}
}

extension+UIApplication+{
++++var+keyWindowInConnectedScenes:+UIWindow?+{
++++++++return+windows.first(where:+{+$0.isKeyWindow+})
++++}
}|2395395|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Swift 5, Xcode 11.4

<pre><code>`UIApplication.shared.keyWindow` 
</code></pre>

It will give deprecation warning. ''keyWindow' was deprecated in iOS 13.0: Should not be used for applications that support multiple scenes as it returns a key window across all connected scenes' because of connected scenes. I use this way.

<pre><code>extension UIView {

 var safeAreaBottom: CGFloat {
 if #available(iOS 11, *) {
 if let window = UIApplication.shared.keyWindowInConnectedScenes {
 return window.safeAreaInsets.bottom
 }
 }
 return 0
 }

 var safeAreaTop: CGFloat {
 if #available(iOS 11, *) {
 if let window = UIApplication.shared.keyWindowInConnectedScenes {
 return window.safeAreaInsets.top
 }
 }
 return 0
 }
}

extension UIApplication {
 var keyWindowInConnectedScenes: UIWindow? {
 return windows.first(where: { $0.isKeyWindow })
 }
}
</code></pre>

blocks|key|1727041|text|Swift+5分机|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1727042|这可以用作扩展，并使用：UIApplication.topSafeAreaHeight调用|1727043|extension+UIApplication+{
++++static+var+topSafeAreaHeight:+CGFloat+{
++++++++var+topSafeAreaHeight:+CGFloat+=+0
+++++++++if+#available(iOS+11.0,+*)+{
+++++++++++++++let+window+=+UIApplication.shared.windows[0]
+++++++++++++++let+safeFrame+=+window.safeAreaLayoutGuide.layoutFrame
+++++++++++++++topSafeAreaHeight+=+safeFrame.minY
+++++++++++++}
++++++++return+topSafeAreaHeight
++++}
}|code-block|syntax|javascript|1727044|UIApplication的扩展是可选的，可以是UIView或任何首选的扩展，甚至可能是更好的全局函数。|1727045|entityMap^0|0|9|0|C|V|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

Swift 5 Extension

This can be used as a Extension and called with: UIApplication.topSafeAreaHeight

<pre><code>extension UIApplication {
 static var topSafeAreaHeight: CGFloat {
 var topSafeAreaHeight: CGFloat = 0
 if #available(iOS 11.0, *) {
 let window = UIApplication.shared.windows[0]
 let safeFrame = window.safeAreaLayoutGuide.layoutFrame
 topSafeAreaHeight = safeFrame.minY
 }
 return topSafeAreaHeight
 }
}
</code></pre>

Extension of UIApplication is optional, can be an extension of UIView or whatever is preferred, or probably even better a global function.

blocks|key|1727057|text|对于那些更改为景观模式的人，您必须确保在旋转之后使用viewSafeAreaInsetsDidChange来获得最更新的值：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1727058|private+var+safeAreaInsets+=+UIEdgeInsets(top:+0,+left:+0,+bottom:+0,+right:+0)

override+func+viewSafeAreaInsetsDidChange()+{
++++++++if+#available(iOS+11.0,+*)+{
++++++++++++safeAreaInsets+=+UIApplication.shared.keyWindow!.safeAreaInsets
++++++++}
}|code-block|syntax|javascript|1727059|entityMap^0|Q|R|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

For those of you who change to landscape mode, you gotta make sure to use viewSafeAreaInsetsDidChange after the rotation to get the most updated values:
<pre><code>private var safeAreaInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)

override func viewSafeAreaInsetsDidChange() {
 if #available(iOS 11.0, *) {
 safeAreaInsets = UIApplication.shared.keyWindow!.safeAreaInsets
 }
}
</code></pre>

blocks|key|3175695|text|Swift+4|type|blockquote|depth|inlineStyleRanges|entityRanges|data|3175696|if+let+window+=+UIApplication.shared.windows.first+{
++++
++++let+topPadding+=+window.safeAreaInsets.top
++++let+bottomPadding+=+window.safeAreaInsets.bottom
++++
}|code-block|syntax|javascript|3175697|从课堂上使用|unstyled|3175698|class+fitToTopInsetConstraint:+NSLayoutConstraint+{
++++
++++override+func+awakeFromNib()+{
++++++++
++++++++if+let+window+=+UIApplication.shared.windows.first+{
++++++++++++
++++++++++++let+topPadding+=+window.safeAreaInsets.top
++++++++++++
++++++++++++self.constant+%2B=+topPadding
++++++++++++
++++++++}
++++++++
++++}
}

class+fitToBottomInsetConstraint:+NSLayoutConstraint+{
++++
++++override+func+awakeFromNib()+{
++++++++
++++++++if+let+window+=+UIApplication.shared.windows.first+{
++++++++++++
++++++++++++let+bottomPadding+=+window.safeAreaInsets.bottom
++++++++++++
++++++++++++self.constant+%2B=+bottomPadding
++++++++++++
++++++++}
++++++++
++++}
}|3175699|​|3175700|📷|atomic|offset|length|3175701|3175702|3175703|3175704|3175705|当您构建应用程序时，您将看到安全区域填充。|3175706|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/00ae88109d6179f87096717e3dc92ce1.png|imageAlt|1|https://developer.qcloudimg.com/http-save/yehe-900000/b7d35193bdfda0b31bb0026a63f06cea.png^0|0|0|0|0|0|0|1|0|0|0|0|0|1|1|0|0|0^^$0|@$1|2|3|4|5|6|7|19|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1A|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|I|7|1B|8|@]|9|@]|A|$]]|$1|J|3|K|5|D|7|1C|8|@]|9|@]|A|$E|F]]|$1|L|3|M|5|I|7|1D|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|1E|8|@]|9|@$Q|1F|R|1G|1|1H]]|A|$]]|$1|S|3|M|5|I|7|1I|8|@]|9|@]|A|$]]|$1|T|3|M|5|I|7|1J|8|@]|9|@]|A|$]]|$1|U|3|O|5|P|7|1K|8|@]|9|@$Q|1L|R|1M|1|1N]]|A|$]]|$1|V|3|M|5|I|7|1O|8|@]|9|@]|A|$]]|$1|W|3|X|5|I|7|1P|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|I|7|1Q|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15|16|-4]]|17|$5|11|12|13|A|$14|18|16|-4]]]]

<blockquote>
Swift 4
</blockquote>
<pre><code>if let window = UIApplication.shared.windows.first {
 
 let topPadding = window.safeAreaInsets.top
 let bottomPadding = window.safeAreaInsets.bottom
 
}
</code></pre>
Use from class
<pre><code>class fitToTopInsetConstraint: NSLayoutConstraint {
 
 override func awakeFromNib() {
 
 if let window = UIApplication.shared.windows.first {
 
 let topPadding = window.safeAreaInsets.top
 
 self.constant += topPadding
 
 }
 
 }
}

class fitToBottomInsetConstraint: NSLayoutConstraint {
 
 override func awakeFromNib() {
 
 if let window = UIApplication.shared.windows.first {
 
 let bottomPadding = window.safeAreaInsets.bottom
 
 self.constant += bottomPadding
 
 }
 
 }
}
</code></pre>
<a href="https://i.stack.imgur.com/AnVAx.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/AnVAx.png" alt="enter image description here" /></a>
<a href="https://i.stack.imgur.com/YbBVq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/YbBVq.png" alt="enter image description here" /></a>
You will see safe area padding when you build your application.

blocks|key|1727110|text|extension+UIViewController+{
++++var+topbarHeight:+CGFloat+{
++++++++return
++++++++++++(view.window?.safeAreaInsets.top+??+0)+%2B
++++++++++++(view.window?.windowScene?.statusBarManager?.statusBarFrame.height+??+0.0)+%2B
++++++++++++(self.navigationController?.navigationBar.frame.height+??+0.0)
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1727111|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>extension UIViewController {
 var topbarHeight: CGFloat {
 return
 (view.window?.safeAreaInsets.top ?? 0) +
 (view.window?.windowScene?.statusBarManager?.statusBarFrame.height ?? 0.0) +
 (self.navigationController?.navigationBar.frame.height ?? 0.0)
 }
}
</code></pre>

blocks|key|1727120|text|对于SwiftUI：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1727121|码|offset|length|style|BOLD|1727122|private+struct+SafeAreaInsetsKey:+EnvironmentKey+{
++++static+var+defaultValue:+EdgeInsets+{
++++++++UIApplication.shared.windows[0].safeAreaInsets.insets
++++}
}

extension+EnvironmentValues+{
++++
++++var+safeAreaInsets:+EdgeInsets+{
++++++++self[SafeAreaInsetsKey.self]
++++}
}

private+extension+UIEdgeInsets+{
++++
++++var+insets:+EdgeInsets+{
++++++++EdgeInsets(top:+top,+leading:+left,+bottom:+bottom,+trailing:+right)
++++}
}|code-block|syntax|javascript|1727123|使用|1727124|struct+MyView:+View+{
++++
++++@Environment(\.safeAreaInsets)+private+var+safeAreaInsets
++++
++++var+body:+some+View+{
++++++++Text("Ciao")
++++++++++++.padding(safeAreaInsets)
++++}
}|1727125|entityMap^0|0|0|1|0|0|0|2|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|W|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

For SwiftUI:
Code
<pre class="lang-swift prettyprint-override"><code>private struct SafeAreaInsetsKey: EnvironmentKey {
 static var defaultValue: EdgeInsets {
 UIApplication.shared.windows[0].safeAreaInsets.insets
 }
}

extension EnvironmentValues {
 
 var safeAreaInsets: EdgeInsets {
 self[SafeAreaInsetsKey.self]
 }
}

private extension UIEdgeInsets {
 
 var insets: EdgeInsets {
 EdgeInsets(top: top, leading: left, bottom: bottom, trailing: right)
 }
}
</code></pre>
Usage
<pre class="lang-swift prettyprint-override"><code>struct MyView: View {
 
 @Environment(\.safeAreaInsets) private var safeAreaInsets
 
 var body: some View {
 Text(&quot;Ciao&quot;)
 .padding(safeAreaInsets)
 }
}
</code></pre>

blocks|key|2395572|text|这里有一个简单的答案，可以找到所有iphone的安全区域高度|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2395573|let+window+=+UIApplication.shared.windows[0]

let+SafeAreaHeight+=+window.safeAreaLayoutGuide.layoutFrame.size.height|code-block|syntax|javascript|2395574|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here is a simple answer to find safe area height for all iphone
<pre><code>let window = UIApplication.shared.windows[0]

let SafeAreaHeight = window.safeAreaLayoutGuide.layoutFrame.size.height
</code></pre>

blocks|key|1727165|text|对于iOS+13%2B/Swift+5，这里没有其他对我有用的地方，只有以下几点：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1727166|++++if+#available(iOS+13.0,+*)+{
++++++++topPadding+=+UIApplication.shared.windows.first?.safeAreaInsets.top+??+0
++++++++bottomPadding+=+UIApplication.shared.windows.first?.safeAreaInsets.bottom+??+0
++++}|code-block|syntax|javascript|1727167|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For iOS 13+/Swift 5, nothing else here worked for me but this:
<pre><code> if #available(iOS 13.0, *) {
 topPadding = UIApplication.shared.windows.first?.safeAreaInsets.top ?? 0
 bottomPadding = UIApplication.shared.windows.first?.safeAreaInsets.bottom ?? 0
 }
</code></pre>

blocks|key|1727209|text|这里有一个基于其他答案的免费函数，一旦您的rootController从任何地方被分层，就应该可以调用它。你可以用它作为一个独立的功能。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1727210|++++func+safeAreaInsets()+->+UIEdgeInsets?+{
++++(UIApplication
++++++++.shared
++++++++.keyWindow?
++++++++.rootViewController)
++++++++.flatMap+{
++++++++++++if+#available(iOS+11.0,+*)+{
++++++++++++++++return+$0.view.safeAreaInsets
++++++++++++}+else+{
++++++++++++++++return+.init(
++++++++++++++++++++top:+$0.topLayoutGuide.length,
++++++++++++++++++++left:+.zero,
++++++++++++++++++++bottom:+$0.bottomLayoutGuide.length,
++++++++++++++++++++right:+.zero
++++++++++++++++)
++++++++++++}
++++++++}
}|code-block|syntax|javascript|1727211|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here's a free function based on other answers that should be callable once your rootController is layed out from anywhere. You can use it as a free standing function.
<pre><code> func safeAreaInsets() -&gt; UIEdgeInsets? {
 (UIApplication
 .shared
 .keyWindow?
 .rootViewController)
 .flatMap {
 if #available(iOS 11.0, *) {
 return $0.view.safeAreaInsets
 } else {
 return .init(
 top: $0.topLayoutGuide.length,
 left: .zero,
 bottom: $0.bottomLayoutGuide.length,
 right: .zero
 )
 }
 }
}
</code></pre>

blocks|key|3175823|text|或者使用SwiftUI+GeometryReader+api。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3175824|struct+V:+View+{
++++var+body:+some+View+{
++++++++GeometryReader+{+geometry+in
++++++++++++Text("\(geometry.safeAreaInsets.top)")
++++++++++++Text("\(geometry.safeAreaInsets.bottom)")
++++++++}
++++}
}|code-block|syntax|javascript|3175825|代码可能不起作用，但说明了这个想法。|3175826|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Or using SwiftUI GeometryReader api.
<pre class="lang-swift prettyprint-override"><code>struct V: View {
 var body: some View {
 GeometryReader { geometry in
 Text(&quot;\(geometry.safeAreaInsets.top)&quot;)
 Text(&quot;\(geometry.safeAreaInsets.bottom)&quot;)
 }
 }
}


</code></pre>
Code might not work, but illustrates the idea.

blocks|key|1727278|text|这适用于整个视图生命周期，作为Swift中的一个简单的2行解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1727279|let+top++++=+UIApplication.shared.windows[0].safeAreaInsets.top
let+bottom+=+UIApplication.shared.windows[0].safeAreaInsets.bottom|code-block|syntax|javascript|1727280|我个人需要它在viewDidLoad和view.safeAreaInsets还没有计算。|offset|length|style|CODE|1727281|entityMap^0|0|0|7|B|J|J|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

This works for the entire view life cycle as a simple 2-line solution in Swift:
<pre><code>let top = UIApplication.shared.windows[0].safeAreaInsets.top
let bottom = UIApplication.shared.windows[0].safeAreaInsets.bottom
</code></pre>
I personally needed it in the <code>viewDidLoad</code> and <code>view.safeAreaInsets</code> isn't calculated yet.

blocks|key|2395695|text|对于iPhone，14种设备使用如下所示。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2395696|let+app+=+UIApplication.shared
var+statusBarHeight:+CGFloat+=+0.0
let+window+=+app.windows.filter+{$0.isKeyWindow}.first
statusBarHeight+=+window?.windowScene?.statusBarManager?.statusBarFrame.height+??+0
let+topPadding+=+window?.safeAreaInsets.top+??+0.0
statusBarHeight+=+statusBarHeight+>=+topPadding+?+statusBarHeight:topPadding|code-block|syntax|javascript|2395697|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For iPhone 14 devices use like following.
<pre><code>let app = UIApplication.shared
var statusBarHeight: CGFloat = 0.0
let window = app.windows.filter {$0.isKeyWindow}.first
statusBarHeight = window?.windowScene?.statusBarManager?.statusBarFrame.height ?? 0
let topPadding = window?.safeAreaInsets.top ?? 0.0
statusBarHeight = statusBarHeight &gt;= topPadding ? statusBarHeight:topPadding
</code></pre>

What would be the most proper way to get both top and bottom height for the unsafe areas?
<a href="https://i.stack.imgur.com/hQXf7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hQXf7.png" alt="enter image description here" /></a>

Get safe area inset top and bottom heights

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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