UIWindow remove error in iOS9.1

Question

In iOS9.1, When I remove a custom UIWindow by removeFromSuperView and set to nil, it did't disappear automatically until click on the window. and show error with

unexpected nil window in _UIApplicationHandleEventFromQueueEvent, _windowServerHitTestWindow: (null)

When in iOS9 and lower,it will works fine.

UIWindow *window = [target associatedValueForKey:lock_window];
if (window) [window removeFromSuperview];
[target associateValue:nil withKey:lock_window];

Answer 1

I has solved the problem with code

UIWindow *window = [target associatedValueForKey:lock_window];
if (window) [window removeFromSuperview];
window.hidden = YES;
[target associateValue:nil withKey:lock_window];

the - (void)makeKeyAndVisible method annotation is

convenience. most apps call this to show the main window and also make it key. otherwise use view hidden property