key window蒙层

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注意点

1.[[UIApplication sharedApplication]keyWindow]放在点击事件方法里面获取

2.设置一个view作为蒙层将alpha设置0.5 将其添加在key window上然后载将想要展示的控件添加在keywindow上等于跟蒙层同一个层次将蒙层压在下面。

- (IBAction)btn:(id)sender {

UIWindow *currentWindow = [[UIApplicationsharedApplication]keyWindow];

//蒙层view

UIView *vv = [[UIViewalloc]initWithFrame:self.view.frame]; vv.backgroundColor = [UIColorpurpleColor];

vv.alpha = 0.5;

[currentWindow addSubview:vv];

//展示的view

UIView *vv2 = [[UIViewalloc]initWithFrame:CGRectMake(100,100, 100,100)];

vv2.backgroundColor = [UIColorredColor];

[currentWindow addSubview:vv2];

UIButton *btn2 = [UIButtonbuttonWithType:UIButtonTypeCustom];

btn2.frame = CGRectMake(0,0, 50,50);

btn2.backgroundColor = [UIColorblueColor];

[btn2 addTarget:selfaction:@selector(aa)forControlEvents:(UIControlEventTouchUpInside)];

[vv2 addSubview:btn2];

}

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