blocks|key|99724|text|上面一些人的回答对我很有效。以下是Swift的翻译，供任何可能需要它的人使用。我将高度设置为接近大多数流行应用的使用高度。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99725|class+TabBar:+UITabBar+{

+++++override+func+sizeThatFits(size:+CGSize)+->+CGSize+{
+++++++++var+sizeThatFits+=+super.sizeThatFits(size)
+++++++++sizeThatFits.height+=+38

+++++++++return+sizeThatFits
+++++}
}|code-block|syntax|javascript|99726|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|$]]

SomeGuy's answer above worked for me. Here's the Swift translation for anyone who may need it. I made the height close to what it seems most popular apps use.

<pre><code>class TabBar: UITabBar {

 override func sizeThatFits(size: CGSize) -&gt; CGSize {
 var sizeThatFits = super.sizeThatFits(size)
 sizeThatFits.height = 38

 return sizeThatFits
 }
}
</code></pre>

blocks|key|99654|text|似乎每个人都说这不是一件容易的事|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99655|在你的故事板中，给你的UITabBar一个定制的子类名称，然后用下面的代码实现这个子类|99656|这会告诉所有使用选项卡栏的视图，它应该是一个特定的高度。|99657|@implementation+MyTabBar

-(CGSize)sizeThatFits:(CGSize)size
{
++++CGSize+sizeThatFits+=+[super+sizeThatFits:size];
++++sizeThatFits.height+=+100;

++++return+sizeThatFits;
}

@end|code-block|syntax|javascript|99658|​|99659|📷|atomic|offset|length|99660|99661|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/14fc32af4c6fb01f4cccd42da64191fe.png|imageAlt^0|0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|13|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|14|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|15|8|@]|9|@]|A|$]]|$1|M|3|N|5|O|7|16|8|@]|9|@$P|17|Q|18|1|19]]|A|$]]|$1|R|3|L|5|6|7|1A|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z|10|-4]]]]

It seems everybody says this can't be done easily

In your storyboard give your UITabBar a custom subclass name, then implement the subclass with the following

This tells all views that use the tab bar that it should be a certain height.

<pre><code>@implementation MyTabBar

-(CGSize)sizeThatFits:(CGSize)size
{
 CGSize sizeThatFits = [super sizeThatFits:size];
 sizeThatFits.height = 100;

 return sizeThatFits;
}

@end
</code></pre>

<img src="https://i.stack.imgur.com/o3RU3.png" alt="enter image description here">

blocks|key|99734|text|在你的UITabBarController中|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99735|-+(void)viewWillLayoutSubviews+{
++++CGRect+tabFrame+=+self.tabBar.frame;
++++tabFrame.size.height+=+80;
++++tabFrame.origin.y+=+self.view.frame.size.height+-+80;
++++self.tabBar.frame+=+tabFrame;+
}|code-block|syntax|javascript|99736|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 your UITabBarController

<pre><code>- (void)viewWillLayoutSubviews {
 CGRect tabFrame = self.tabBar.frame;
 tabFrame.size.height = 80;
 tabFrame.origin.y = self.view.frame.size.height - 80;
 self.tabBar.frame = tabFrame; 
}
</code></pre>

blocks|key|4606227|text|在swift中，通过使用UITabBar的扩展，甚至比上面建议的所有解决方案都更简单，不需要子类化：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4606228|extension+UITabBar+{

++++override+public+func+sizeThatFits(size:+CGSize)+->+CGSize+{
++++++++super.sizeThatFits(size)
++++++++var+sizeThatFits+=+super.sizeThatFits(size)
++++++++sizeThatFits.height+=+<Insert+your+height+here>
++++++++return+sizeThatFits
++++}
}|code-block|syntax|javascript|4606229|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 it is even simpler than all solutions suggested above by using an extensions to UITabBar, no subclassing necessary:

<pre><code>extension UITabBar {

 override public func sizeThatFits(size: CGSize) -&gt; CGSize {
 super.sizeThatFits(size)
 var sizeThatFits = super.sizeThatFits(size)
 sizeThatFits.height = &lt;Insert your height here&gt;
 return sizeThatFits
 }
}
</code></pre>

blocks|key|99772|text|如果启用了自动布局，则需要覆盖instrinsicContentSize|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99773|Proper+usage+of+intrinsicContentSize+and+sizeThatFits:+on+UIView+Subclass+with+autolayout|offset|length|99774|class+TabBar:+UITabBar+{
++++override+func+intrinsicContentSize()+->+CGSize+{
++++++++var+intrinsicSize+=+super.frame.size

++++++++intrinsicSize.height+=+120
++++++++return+intrinsicSize
+++++}
}|code-block|syntax|javascript|99775|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/24127032/proper-usage-of-intrinsiccontentsize-and-sizethatfits-on-uiview-subclass-with-a^0|0|0|2H|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

If you have auto layout enabled, you will need to override instrinsicContentSize instead

<a href="https://stackoverflow.com/questions/24127032/proper-usage-of-intrinsiccontentsize-and-sizethatfits-on-uiview-subclass-with-a">Proper usage of intrinsicContentSize and sizeThatFits: on UIView Subclass with autolayout</a>

<pre><code>class TabBar: UITabBar {
 override func intrinsicContentSize() -&gt; CGSize {
 var intrinsicSize = super.frame.size

 intrinsicSize.height = 120
 return intrinsicSize
 }
}
</code></pre>

blocks|key|99567|text|开发人员不拥有tabBar，框架拥有。它将与你抗争，以确保tabBar保持相同的高度。如果你想解决这个问题，你可以制作你自己的工具栏，并为它的高度添加自动布局约束，强制它保持任何你想要的高度。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99568|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

The developer doesn't own the tabBar, the framework does. It will fight you to make sure that the tabBar stays the same height. If you want to work around this, you can make your own toolbar and add autlayout constraints to its height to force it to stay whatever height you'd like.

blocks|key|4606276|text|如果您使用的是iOS+11，那么下面的内容将会有所帮助|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4606277|-(CGSize)sizeThatFits:(CGSize)size
{
++++CGSize+sizeThatFits+=+[super+sizeThatFits:size];
++++sizeThatFits.height+=+60;

++++if+(@available(iOS+11.0,+*))+{
++++++++UIWindow+*window+=+UIApplication.sharedApplication.keyWindow;
++++++++CGFloat+bottomPadding+=+window.safeAreaInsets.bottom;
++++++++sizeThatFits.height+%2B=+bottomPadding;
++++}

++++return+sizeThatFits;
}|code-block|syntax|javascript|4606278|基本上需要覆盖安全区域，否则iPhone+X上的选项卡栏高度会显得很低。|4606279|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|$]]

If you are on iOS 11 then following will help 

<pre><code>-(CGSize)sizeThatFits:(CGSize)size
{
 CGSize sizeThatFits = [super sizeThatFits:size];
 sizeThatFits.height = 60;

 if (@available(iOS 11.0, *)) {
 UIWindow *window = UIApplication.sharedApplication.keyWindow;
 CGFloat bottomPadding = window.safeAreaInsets.bottom;
 sizeThatFits.height += bottomPadding;
 }

 return sizeThatFits;
}
</code></pre>

Basically need to cover safe area, else tabbar height on iPhone X appears to be low.

blocks|key|4606415|text|对于iOS11及更高版本，您可以使用以下命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4606416|-+(void)viewDidLayoutSubviews+{
++++[super+viewDidLayoutSubviews];
++++if+(@available(iOS+11.0,+*))+{
++++++++self.additionalSafeAreaInsets+=+UIEdgeInsetsMake(0,+0,+20,+0);
++++}+
}|code-block|syntax|javascript|4606417|对于所有的os，创建UITabBar子类，在UITabBarController中使用它，并在自定义标签栏类的实现中实现以下方法：|4606418|-(CGSize)sizeThatFits:(CGSize)size+{
++++CGSize+sizeThatFits+=+[super+sizeThatFits:size];
++++sizeThatFits.height+=+kBarHeight;
++++return+sizeThatFits;
}|4606419|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|$]]

For iOS11 and above you can use below:
<pre><code>- (void)viewDidLayoutSubviews {
 [super viewDidLayoutSubviews];
 if (@available(iOS 11.0, *)) {
 self.additionalSafeAreaInsets = UIEdgeInsetsMake(0, 0, 20, 0);
 } 
}
</code></pre>
And for all os, create UITabBar subclass, use it in the UITabBarController and implement below method in the implementation of custom tab bar class:
<pre><code>-(CGSize)sizeThatFits:(CGSize)size {
 CGSize sizeThatFits = [super sizeThatFits:size];
 sizeThatFits.height = kBarHeight;
 return sizeThatFits;
}
</code></pre>

I am trying to change the height of the stock UITabBar to 44px, similar to Tweetbot's tab bar height. I've also seen a few other apps do this as well.

<img src="https://i.stack.imgur.com/0hELS.jpg" alt="">

however, when i try to set the height it still remains the same

<pre><code>self.tabBar.frame.height = 40
</code></pre>

are we not allowed to change the tab bar height? and if so what is a good alternative? using a toolbar?

changing the height of UITabBar in iOS7/8?

Swift

我正在尝试将股票UITabBar的高度更改为44px，类似于Tweetbot的标签栏高度。我也看到过一些其他的应用程序也能做到这一点。​​但是，当我尝试设置高度时，它仍然保持不变self.tabBar.frame.height = 40我们不允许更改选项卡栏高度吗？如果是这样的话，什么是一个好的选择？使用工具栏？

问在iOS7/8中改变UITabBar的高度？
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问在iOS7/8中改变UITabBar的高度？EN

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问在iOS7/8中改变UITabBar的高度？
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