关闭外部点击 iOS 8 上的模态表单视图

Question

我一直试图在 iOS 8 上关闭模式表单视图，但没有成功， 我试过这段代码

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]) 
    {
       // Remove the recognizer first so it's view.window is valid.
      [self.view.window removeGestureRecognizer:sender];
      [self dismissModalViewControllerAnimated:YES];
    }
 }
}

但它没有检测到外部视图点击，有什么建议吗？

Answer 1

iOS 8 其实有两个问题。第一，手势识别没有开始。

我通过添加UIGestureRecognizerDelegate 协议并实现来解决了这个问题

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer*)otherGestureRecognizer
{
    return YES;
}

另外，别忘了注册代理

recognizer.delegate = self;

现在手势识别器应该可以识别手势并且目标方法 (handleTapBehind:) 将被调用。

这是 iOS 8 中的第二个问题：如果 nil 作为视图传递，locationInView: 似乎没有考虑设备方向。相反，传递根视图是可行的。

这是我似乎适用于 iOS 7.1 和 8.0 的目标代码：

if (sender.state == UIGestureRecognizerStateEnded) {
    UIView *rootView = self.view.window.rootViewController.view;
    CGPoint location = [sender locationInView:rootView];
    if (![self.view pointInside:[self.view convertPoint:location fromView:rootView] withEvent:nil]) {
        [self dismissViewControllerAnimated:YES completion:^{
            [self.view.window removeGestureRecognizer:sender];
        }];
    }
}

Answer 2

在 iOS 8 中，您可以查看使用新的 UIPresentationController 类。它使您可以更好地控制自定义视图控制器演示文稿周围的容器（允许您正确添加自己的手势识别器）。

这里还有一个非常简单的教程的链接：http://dativestudios.com/blog/2014/06/29/presentation-controllers/

然后添加调光视图点击关闭：

    UITapGestureRecognizer *singleFingerTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
    [self.dimmingView addGestureRecognizer:singleFingerTap];


- (void)handleSingleTap:(UITapGestureRecognizer *)recognizer {
    [self.presentingViewController dismissViewControllerAnimated:YES completion:nil];
}

Answer 3

适用于纵向和横向的 Swift 3.1 解决方案。

class TapBehindModalViewController: UIViewController, UIGestureRecognizerDelegate {
    private var tapOutsideRecognizer: UITapGestureRecognizer!

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        if(self.tapOutsideRecognizer == nil) {
            self.tapOutsideRecognizer = UITapGestureRecognizer(target: self, action: #selector(self.handleTapBehind))
            self.tapOutsideRecognizer.numberOfTapsRequired = 1
            self.tapOutsideRecognizer.cancelsTouchesInView = false
            self.tapOutsideRecognizer.delegate = self
            self.view.window?.addGestureRecognizer(self.tapOutsideRecognizer)
        }
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)

        if(self.tapOutsideRecognizer != nil) {
            self.view.window?.removeGestureRecognizer(self.tapOutsideRecognizer)
            self.tapOutsideRecognizer = nil
        }
    }

    func close(sender: AnyObject) {
        self.dismiss(animated: true, completion: nil)
    }

    // MARK: - Gesture methods to dismiss this with tap outside
    func handleTapBehind(sender: UITapGestureRecognizer) {
        if (sender.state == UIGestureRecognizerState.ended) {
            let location: CGPoint = sender.location(in: self.view)

            if (!self.view.point(inside: location, with: nil)) {
                self.view.window?.removeGestureRecognizer(sender)
                self.close(sender: sender)
            }
        }
    }

    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true
    }
}