UIWindow介绍

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创建一个Window

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UIWindow *greenWindow = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
greenWindow.windowLevel = UIWindowLevelStatusBar;
greenWindow.backgroundColor = [UIColor greenColor];
greenWindow.alpha = 0.3;
// default hidden=YES
greenWindow.hidden = NO;

这样greenWindow就已经放在屏幕上显示了

隐藏Window

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greenWindow.hidden = YES;
greenWindow = nil;

给Window添加单击事件

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UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:selector(greenWindowTapped:)];
[greenWindow addGestureRecognizer:tap];