blocks|key|1214821|text|它是320+x+49。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1214822|如果你想测试，打开接口生成器，添加一个UITabBar，进入标尺，你就会看到它|1214823|UITabBar+is+inherited+from+UIVIew，因此您可以使用frame.size.height来获取高度|offset|length|1214824|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.apple.com/iphone/library/documentation/uikit/reference/UITabBar_Class/Reference/Reference.html|1|http://developer.apple.com/iphone/library/documentation/uikit/reference/UIView_Class/UIView/UIView.html#//apple_ref/doc/uid/TP40006816-CH3-SW5^0|0|0|0|X|0|15|H|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$F|U|G|V|1|W]|$F|X|G|Y|1|Z]]|A|$]]|$1|H|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]|P|$5|K|L|M|A|$N|Q]]]]

It is 320 x 49. 

If you want to test, open Interface Builder, add a UITabBar, go into the ruler, you will see it

<a href="http://developer.apple.com/iphone/library/documentation/uikit/reference/UITabBar_Class/Reference/Reference.html" rel="noreferrer">UITabBar is inherited from UIVIew</a> so you can use the <a href="http://developer.apple.com/iphone/library/documentation/uikit/reference/UIView_Class/UIView/UIView.html#//apple_ref/doc/uid/TP40006816-CH3-SW5" rel="noreferrer">frame.size.height</a> to get the height

blocks|key|1215060|text|如果视图控制器具有作为选项卡栏控制器的祖先，则可以从该选项卡栏检索高度。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1215061|CGFloat+tabBarHeight+=+self.tabBarController.tabBar.frame.size.height;|code-block|syntax|javascript|1215062|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|$]]

If the view controller has an ancestor that is a tab bar controller, you can retrieve the height from that tab bar.

<pre><code>CGFloat tabBarHeight = self.tabBarController.tabBar.frame.size.height;
</code></pre>

blocks|key|1215223|text|在Swift中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1215224|let+height+=+self.tabBarController?.tabBar.frame.height+??+49.0|code-block|syntax|javascript|1215225|依赖于标签栏的实际高度，并使用幻数作为后备选项。|1215226|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|$]]

In Swift:

<pre><code>let height = self.tabBarController?.tabBar.frame.height ?? 49.0
</code></pre>

Relying on the actual height of the tab-bar, and using the magic number as a fallback.

blocks|key|1000905|text|Swift+3%2B|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1000906|let+tabBarHeight+=+tabBarController?.tabBar.frame.size.height
print(tabBarHeight+??+"not+defined")|code-block|syntax|javascript|1000907|它应该打印49.0+(CGFloat类型)|1000908|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|$]]

Swift 3+

<pre><code>let tabBarHeight = tabBarController?.tabBar.frame.size.height
print(tabBarHeight ?? "not defined")
</code></pre>

It should print 49.0 (Type CGFloat)

blocks|key|1214917|text|我希望做一些类似的事情，在ViewController视图的可见部分居中放置标签。此ViewController属于某个UITabBarController。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1214918|下面是我用来使标签居中的代码：|1214919|UILabel+*roomLabel+=+[[UILabel+alloc]+init];
CGRect+frame+=+[[self+view]+bounds];
float+tabBarHeight+=+[[[super+tabBarController]+tabBar]+frame].size.height;
frame.size.height+-=+tabBarHeight;
[roomLabel+setFrame:frame];
[[self+view]+addSubview:roomLabel];
[roomLabel+release];|code-block|syntax|javascript|1214920|请注意，我使用的是[自身视图边界]而不是[自身视图帧]，因为后者包含20像素的顶部条作为Y偏移量(这会取消垂直居中)。|1214921|希望这对某些人有帮助！|1214922|顺便说一下:我使用的是TabBar+4.3和XCode+4，而TabBar的高度的“硬编码”值对我来说仍然是49！|1214923|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

I was looking to do something similar with centering a label in the VISIBLE portion of a ViewController's view. This ViewController belonged to a UITabBarController.

Here's the code I used to center my label:

<pre><code>UILabel *roomLabel = [[UILabel alloc] init];
CGRect frame = [[self view] bounds];
float tabBarHeight = [[[super tabBarController] tabBar] frame].size.height;
frame.size.height -= tabBarHeight;
[roomLabel setFrame:frame];
[[self view] addSubview:roomLabel];
[roomLabel release];
</code></pre>

Notice that I used [[self view] bounds] not [[self view] frame] because the latter includes the 20 pixel top bar as the Y offset (which throws off the vertical centering).

Hope this helps someone!

By the way: I'm using iOS 4.3 and XCode 4 and the "hard-code" value for the TabBar's height is still 49 for me!

blocks|key|1214998|text|我知道这并不理想，但我真的不想在任何地方都有一个神奇的数字常量。我所做的是创建一个一次性的UITabBarController，并从那里获得高度。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1214999|我这样做的另一个原因是UITabBar+initWithFrame:可以正常工作，但是做一个条形图setFrame:就不行了，我需要框架在创建时是正确的。|1215000|UITabBarController+*dtbc+=+[[[UITabBarController+alloc]+init]+autorelease];

CGRect+tabRect+=+[[[self+navigationController]+view]+frame];
tabRect.origin.y+=+tabRect.size.height+-+[[dtbc+tabBar]+frame].size.height;
tabRect.size.height+=+[[dtbc+tabBar]+frame].size.height;

tabBar_+=+[[UITabBar+alloc]+initWithFrame:tabRect];|code-block|syntax|javascript|1215001|我喜欢这一点是，无论父项的大小如何，它都会正确地将选项卡栏放在父项的底部。|1215002|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I know this isn't ideal, but I really didn't want to have a magic number constant anywhere. What I did was create a throwaway UITabBarController, and get the height from there.

I did this also because [UITabBar initWithFrame:] works as desired, but doing a [bar setFrame:] doesn't. I needed the frame to be correct at creation.

<pre><code>UITabBarController *dtbc = [[[UITabBarController alloc] init] autorelease];

CGRect tabRect = [[[self navigationController] view] frame];
tabRect.origin.y = tabRect.size.height - [[dtbc tabBar] frame].size.height;
tabRect.size.height = [[dtbc tabBar] frame].size.height;

tabBar_ = [[UITabBar alloc] initWithFrame:tabRect];
</code></pre>

What I like about this is that it will correctly place the tab bar at the bottom of the parent regardless of the parents size.

blocks|key|1215123|text|在大多数情况下，这应该适用于任何UIViewController实例：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1215124|bottomLayoutGuide.length|code-block|syntax|javascript|1215125|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|$]]

This should work in most cases on any instance of UIViewController:

<pre><code>bottomLayoutGuide.length
</code></pre>

blocks|key|1215337|text|在swift+4和5中。self.tabBarController?.getHeight()|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1215338|extension+UITabBarController{

++++func+getHeight()->CGFloat{
++++++++return+self.tabBar.frame.size.height
++++}

++++func+getWidth()->CGFloat{
+++++++++return+self.tabBar.frame.size.width
++++}
}|code-block|syntax|javascript|1215339|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 swift 4 and 5. self.tabBarController?.getHeight()

<pre><code>extension UITabBarController{

 func getHeight()-&gt;CGFloat{
 return self.tabBar.frame.size.height
 }

 func getWidth()-&gt;CGFloat{
 return self.tabBar.frame.size.width
 }
}
</code></pre>

blocks|key|1001026|text|这就是我如何让它在swift+4.1中工作的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1001027|let+tabBarHeight+=+CGFloat((self.tabBarController?.tabBar.frame.size.height)!)|code-block|syntax|javascript|1001028|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|$]]

This is how I got it to work in swift 4.1
<pre><code>let tabBarHeight = CGFloat((self.tabBarController?.tabBar.frame.size.height)!)
</code></pre>

blocks|key|1001107|text|let+screenHeight+=+UIApplication.shared.statusBarFrame.height+%2B
++++++++++++self.navigationController!.navigationBar.frame.height+%2B+(tabBarController?.tabBar.frame.size.height)!|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1001108|基于这里的几个ppls答案，这个方法工作得很好。|unstyled|1001109|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>let screenHeight = UIApplication.shared.statusBarFrame.height +
 self.navigationController!.navigationBar.frame.height + (tabBarController?.tabBar.frame.size.height)!
</code></pre>
This works perfectly, based it of a few ppls answer here

I'm writing an app that uses <code>UITabBar</code> for parts of the navigation. I'm also using <code>UIScrollView</code> for presenting more information than what the screen can typically handle. Because of this, I'm needing to set the scroll view to take into account the height of the <code>UITabBar</code> so that all of the information is displayed.

Is there a way to calculate the <code>height</code> of the <code>UITabBar</code>?

calculating height of UITabBar

Swift

我正在编写一个应用程序，它使用UITabBar进行部分导航。我还使用UIScrollView来呈现超出屏幕通常处理能力的更多信息。因此，我需要将滚动视图设置为考虑到UITabBar的高度，以便显示所有信息。有没有办法计算UITabBar的height

问计算UITabBar的高度
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