你可以使用UIWindow,
UIApplication *app = [UIApplication sharedApplication];
UIWindow *overlapView = [UIWindow new];
overlapView.windowLevel = UIWindowLevelStatusBar + 1;
overlapView.frame = app.statusBarFrame; // you can set any size of frame you want
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UIWindow的PS实例默认设置为hidden = YES,因此当你想要显示overlapView时你应该设置hidden = NO;
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