多个模态视图点击以关闭

Question

我设置了一种机制，可以通过点击视图外部来关闭模态视图控制器。设置如下：

- (void)viewDidAppear:(BOOL)animated
{
    UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapBehind:)];
    [recognizer setNumberOfTapsRequired:1];
    recognizer.cancelsTouchesInView = NO; //So the user can still interact with controls in the modal view
    [self.view.window addGestureRecognizer:recognizer];

}

- (void)handleTapBehind:(UITapGestureRecognizer *)sender
{
    if (sender.state == UIGestureRecognizerStateEnded)
    {
        CGPoint location = [sender locationInView:nil]; //Passing nil gives us coordinates in the window

        //Then we convert the tap's location into the local view's coordinate system, and test to see if it's in or outside. If outside, dismiss the view.

        if (![self.view pointInside:[self.view convertPoint:location fromView:self.view.window] withEvent:nil]) 
        {
            [self dismissModalViewControllerAnimated:YES];
            NSLog(@"There are %d Gesture Recognizers",[self.view.window gestureRecognizers].count);
            [self.view.window removeGestureRecognizer:sender];
        }
    }
}

这对于关闭单个模态视图非常有效。现在假设我有两个模态视图，一个从根视图控制器（视图 A）中调用，然后从第一个模态视图（视图 B）中调用另一个模态视图

有点像这样：

根视图 -> 视图 A -> 视图 B

当我点击关闭视图 B 时，一切正常。但是，当我尝试关闭视图 A 时，我收到 EXC_BAD_ACCESS 错误。打开僵尸后，似乎视图 B 仍然收到发送给它的消息 handleTapBehind:，即使它在视图 B 之后已被关闭并且内存不足已关闭。

我的问题是为什么视图 B 仍然收到消息？ （handleTapBehind: 确保手势识别器应该已从关联窗口中删除。）在视图 B 已关闭后，如何将其发送到视图 A。

PS。上面的代码出现在 View A 和 View B 的控制器内部，并且是相同的。

编辑

以下是我如何调用模态视图控制器，此代码位于标准视图层次结构中的视图控制器内。

LBModalViewController *vc = [[LBModalViewController alloc] initWithNibName:@"LBModalViewController" bundle:nil];
[vc.myTableView setDataSource:vc];
[vc setDataArray:self.object.membersArray];

[vc setModalPresentationStyle:UIModalPresentationFormSheet];
[vc setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];

[vc.view setClipsToBounds:NO];

[self presentViewController:vc animated:YES completion:nil];

// This is a hack to modify the size of the presented view controller
CGPoint modalOrigin = vc.view.superview.bounds.origin;
[[vc.view superview] setBounds:CGRectMake(modalOrigin.x, modalOrigin.y, 425, 351)];
[vc.view setBounds:CGRectMake(modalOrigin.x, modalOrigin.y, 425, 351)];

差不多就是这样，其他的都很标准。

Answer 1

[self dismissModalViewControllerAnimated:YES];

[self.view.window removeGestureRecognizer:sender];

应该是：

[self.view.window removeGestureRecognizer:sender];

[self dismissModalViewControllerAnimated:YES];

否则你会得到不确定的结果。