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I got a window from the code below in iOS11:
UIWindow *window = [UIApplication sharedApplication].windows.lastObject;

its infomations were printed on console is like this: <_UIInteractiveHighlightEffectWindow: 0x7fdfe84b88e0; frame = (0 0; 375 812); hidden = YES; opaque = NO; userInteractionEnabled = NO; gestureRecognizers = ; layer = >

what's confused me is its isHidden property default value is YES, why ? I tried to search some more infomation about it with key word "_UIInteractiveHighlightEffectWindow", l got nothing but it's a new property in iOS11. Apple also gives nothing about it . Any one know something about it ? Any help is appreciated ! thanks !

user3109791
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Yes, "_UIInteractiveHighlightEffectWindow" is new on iOS, and there isn't much information about it currently. However, if the topmost layers is need, use [UIApplication sharedApplication].keyWindow instead of [UIApplication sharedApplication].windows.lastObject, that would probably solve the problem. I found some good explanation here:

diffrence between [[[[UIApplication sharedApplication] delegate] window] and [[UIApplication sharedApplication].keyWindow?

Dtmelrz
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  • Thanks for your answer ! l have changed [UIApplication sharedApplication].windows.lastObject to [UIApplication sharedApplication].keyWindow .It works ! But what's _UIInteractiveHighlightEffectWindow used for ? l'm really curious about it ! But apple offers no information about it ! This really confuses me ! – user3109791 Nov 02 '17 at 03:57