如何用iOS的View在屏幕上添加一个全屏的遮罩层？

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plaintext使用UIView添加覆盖视图：view=[UIView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height);view.backgroundColor=[UIColor blackColor];view.alpha=0.5;

+(UIView*)addCoverView{

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];
view.backgroundColor = [UIColor blackColor];
view.alpha = 0.5;
[[UIApplication sharedApplication].keyWindow addSubview:view];

return view;
}

+(void)removeCoverView:(UIView*)view{
[view removeFromSuperview];
}