<pre>
UIView* myView = /* Your custom view /;
UIWindow currentWindow = [UIApplication sharedApplication].keyWindow;
[currentWindow addSubview:myView];
</pre>
参考链接：
Add a UIView above all, even the navigation bar
<pre>
UIView* myView = /* Your custom view /;
UIWindow currentWindow = [UIApplication sharedApplication].keyWindow;
[currentWindow addSubview:myView];
</pre>
参考链接：
Add a UIView above all, even the navigation bar
本文标题：在所有的视图上添加一个UIView包括navigation ba
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