在外面点击时删除视图

问题描述

我有一个 UIView，当点击按钮时会出现它，我基本上将它用作自定义警报视图.现在，当用户在我添加到主视图的自定义 UIView 之外点击时，我想隐藏自定义视图，我可以使用 customView.hidden = YES; 轻松做到这一点，但我如何检查视图外的水龙头?

I have a UIView, that I have appear when a button is tapped, I am using it as a custom alert view essentially. Now when the user taps outside the custom UIView that I added to the main view, I want to hide the cusomt view, I can easily do this with customView.hidden = YES; but how can I check for the tap outside the view?

感谢您的帮助

推荐答案

有两种方法

第一种方法

您可以为自定义视图设置标签:

You can set a tag for your custom view:

customview.tag=99;

然后在您的视图控制器中，使用 touchesBegan:withEvent: 委托

An then in your viewcontroller, use the touchesBegan:withEvent: delegate

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    UITouch *touch = [touches anyObject];

    if(touch.view.tag!=99){
        customview.hidden=YES;
    }
}

第二种方法

更有可能的是，每次你想弹出一个自定义视图时，它背后都有一个覆盖层，它会填满你的屏幕(例如，alpha ~0.4 的黑色视图).在这些情况下，您可以向其添加 UITapGestureRecognizer，并在每次希望显示自定义视图时将其添加到您的视图中.举个例子:

It's more likely that every time you want to popup a custom view, there's an overlay behind it, which will fill your screen (e.g. a black view with alpha ~0.4). In these cases, you can add an UITapGestureRecognizer to it, and add it to your view every time you want your custom view to show up. Here's an example:

UIView *overlay;

-(void)addOverlay{
        overlay = [[UIView alloc] initWithFrame:CGRectMake(0,  0,self.view.frame.size.width, self.view.frame.size.height)];
    [overlay setBackgroundColor:[UIColor colorWithRed:0 green:0 blue:0 alpha:0.5]];

    UITapGestureRecognizer *overlayTap =
    [[UITapGestureRecognizer alloc] initWithTarget:self
                                        action:@selector(onOverlayTapped)];

    [overlay addGestureRecognizer:overlayTap];
    [self.view addSubview:overlay];
}

- (void)onOverlayTapped
{
    NSLog(@"Overlay tapped");
    //Animate the hide effect, you can also simply use customview.hidden=YES;
    [UIView animateWithDuration:0.2f animations:^{
        overlay.alpha=0;
        customview.alpha=0;
    }completion:^(BOOL finished) {
        [overlay removeFromSuperview];
    }];
}

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