blocks|key|4318246|text|UIApplicationDelegate通常引用“主窗口”：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4318247|[[[UIApplication+sharedApplication]+delegate]+window];|code-block|syntax|javascript|4318248|此外，UIApplication还拥有一系列windows+[[UIApplication+sharedApplication]+windows]。|4318249|请参阅UIApplication+Class+Reference。|4318250|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/documentation/uikit/uiapplication^0|0|L|0|0|3|D|U|17|0|3|T|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|15|8|@]|D|@$9|16|A|17|1|18]]|E|$]]|$1|O|3|-4|5|6|7|19|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

The <code>UIApplicationDelegate</code> usually has a reference to the "main window":

<pre><code>[[[UIApplication sharedApplication] delegate] window];
</code></pre>

Furthermore, <code>UIApplication</code> has an array of windows <code>[[UIApplication sharedApplication] windows]</code>.

See the <a href="https://developer.apple.com/documentation/uikit/uiapplication" rel="noreferrer">UIApplication Class Reference</a>.

blocks|key|1722976|text|我不是百分之百确定这在每种情况下都有效，但这应该是有效的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1722977|UIWindow+*mainWindow+=+[UIApplication+sharedApplication].windows[0];|code-block|syntax|javascript|1722978|窗口按从后到前的顺序排列，因此主窗口应始终位于索引0。|1722979|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|$]]

I'm not 100% sure this works in every case but this should work:

<pre><code>UIWindow *mainWindow = [UIApplication sharedApplication].windows[0];
</code></pre>

The windows are ordered back to front so the main window should always be at index 0.

blocks|key|1722983|text|UIApplication+*application+=+[UIApplication+sharedInstance];
NSarray+*appWindows+=+[NSArray+arrayWithArray:application.windows];
UIWindow+*mainWindow+=+[appWindows+objectAtIndex:0];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1722984|我不确定，但这可能会有帮助。|unstyled|1722985|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>UIApplication *application = [UIApplication sharedInstance];
NSarray *appWindows = [NSArray arrayWithArray:application.windows];
UIWindow *mainWindow = [appWindows objectAtIndex:0];
</code></pre>

I am not sure but this might help.

blocks|key|1720608|text|在Swift中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1720609|UIApplication.sharedApplication().delegate?.window|code-block|syntax|javascript|1720610|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:

<pre><code>UIApplication.sharedApplication().delegate?.window
</code></pre>

blocks|key|5735541|text|对我来说，我展示的是一个popViewController|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5735542|self.presentViewController(popViewController,+animated:+true,+completion:+nil)|code-block|syntax|javascript|5735543|然后在这个popViewController+的viewDidLoad()中，我添加了一个子视图，这会导致控制台中出现错误和显示错误。因此，我必须找到另一个解决方案来使其工作。希望这能有所帮助。|BOLD|5735544|entityMap^0|C|H|0|0|N|P|O|D|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|S|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|T|8|@$9|U|A|V|B|M]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|N|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|O|$]]

For me I was presenting a <code>popViewController</code>

<pre><code>self.presentViewController(popViewController, animated: true, completion: nil)
</code></pre>

and then in the <code>viewDidLoad()</code> of this popViewController I was adding a subview, this causes the error in the console and a display bug. So I have to find another solution to make it work. Hope this helps.

blocks|key|2206254|text|Swift+3|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2206255|++++if+let+window+=+NSApplication.shared().windows.first+{
++++++++//+you+can+now+modify+window+attributes
++++}|code-block|syntax|javascript|2206256|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|$]]

Swift 3

<pre><code> if let window = NSApplication.shared().windows.first {
 // you can now modify window attributes
 }
</code></pre>

blocks|key|5735595|text|Swift+3.0版本的rmaddy's+answer|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5735596|let+window+=+UIApplication.shared.windows.first|code-block|syntax|javascript|5735597|我还应该补充的是，由于iOS+8.0+UIAlertController已经取代了UIAlertView并成为视图控制器，因此您可能不再需要面对创建新窗口的问题。|style|CODE|5735598|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/17841229/2305521^0|C|F|0|0|0|J|H|15|B|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@$A|10|B|11|K|L]|$A|12|B|13|K|L]]|9|@]|C|$]]|$1|M|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

Swift 3.0 version of <a href="https://stackoverflow.com/a/17841229/2305521">rmaddy's answer</a>:

<pre><code>let window = UIApplication.shared.windows.first
</code></pre>

I also should add that since iOS 8.0 <code>UIAlertController</code> has replaced <code>UIAlertView</code> and being a view controller you may no longer face the issue of new windows being created.

blocks|key|5735600|text|Swift+3|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5735601|class+func+sharedInstance()+->+AppDelegate{
++++++++return+UIApplication.shared.delegate+as!+AppDelegate
++++}|code-block|syntax|javascript|5735602|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|$]]

Swift 3

<pre><code>class func sharedInstance() -&gt; AppDelegate{
 return UIApplication.shared.delegate as! AppDelegate
 }
</code></pre>

UIApplication has a method <code>keyWindow</code>, however if an alert view is showing then this returns the window of the alert view and not the main window of the application.

How can I get the app's main window?

Get Application's main window

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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UIApplication具有keyWindow方法，但是，如果显示警报视图，则返回警报视图的窗口，而不是应用程序的主窗口。如何获取应用程序的主窗口？

问获取应用程序的主窗口
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