iOS UIAlertview(8.0之前) 点击空白让它消失

iOS UIAlertview(8.0之前) 点击空白让它消失

前言:UIAlertView在iOS 8.0 之后被废弃, 取而代之的是UIAlertControler, UIAlertView 苹果提供的接口并没有点击空白消失的方法, 在某些情况下我们需要在点击空白时, 让alertView 消失, 这里的思路是在alertView的widow层添加点击手势, 在点击时调用alertView的dismiss...方法

/**
 弹出alertView的方法

 @param message alertView - message
 @param cancelTitle 关闭弹窗的按钮
 */
- (void)alertShowWithMessage:(NSString *)message  cancelTitle:(NSString *)cancelTitle{
    
    //保证每次都是初始化alert 防止多次调用弹窗信息不刷新
    if (_alert) {
        _alert = nil;
    }
    _alert = [[UIAlertView alloc] initWithTitle:@"提示" message:message delegate:self cancelButtonTitle:cancelTitle otherButtonTitles:nil, nil];

    [_alert show];
    
    //在alertView的window层添加点击手势
    UITapGestureRecognizer *gestur = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];
    [_alert.window addGestureRecognizer:gestur];
}



/**
 点击alertView的空白处让AlertView消失

 @param sender 手势参数
 */
- (void)tapAction:(UITapGestureRecognizer *)sender {
    
    if (sender.state == UIGestureRecognizerStateEnded) {
        CGPoint location = [sender locationInView:nil];
        if (![_alert pointInside:[_alert convertPoint:location fromView:_alert.window] withEvent:nil]) {
            [_alert.window removeGestureRecognizer:sender];
            //调用alertView消失的方法
            [_alert dismissWithClickedButtonIndex:0 animated:YES];
        }
    }
}