不同 uiview 中的 iOS 多点触控事件

Question

我在 UIViewcontroller 上有两个不同的 UIView。

那个UIView就是左UIView(leftScreenView)和右UIView(rightScreenView)。

它们是区分 subview leftJoystickView(on leftScreenView) 和 rightJoystickView(on rightScreenView)。

但我发现了以下问题:

当我在 leftScreenView 上触摸并移动时，现在我在 rightScreenView 上触摸另一个手指。

现在触摸事件总是在 leftScreenView 上。无法区分 leftScreenView 和 rightScreenView 事件。

我需要同时触摸 leftScreenView 和移动以及触摸 rightScreenView 移动是不同的事件(移动)。

如何处理多点触控以区分不同的移动事件和开始事件？

 #pragma mark ----- touch action -----
 -(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
 {
 //    NSLog(@"------touchesBegan-------");
     UITouch *touch = [[event allTouches] anyObject];

     CGPoint touchViewPoint = [touch locationInView:touch.view];

     CGPoint  touchLeftScreenPoint = [touch.view convertPoint:touchViewPoint toView:self.leftScreenView];
     CGPoint  touchRightScreenPoint = [touch.view convertPoint:touchViewPoint toView:self.rightScreenView];

     NSLog(@"touch left:%d",[self.leftScreenView pointInside:touchLeftScreenPoint withEvent:event]);
      NSLog(@"touch right:%d",[self.rightScreenView pointInside:touchRightScreenPoint withEvent:event]);

     NSLog(@"touch.tapCount:%ld", touch.tapCount);

     if( [self.leftScreenView pointInside:touchLeftScreenPoint withEvent:event] )
     {
         NSLog(@"began click left screen");

         self.leftStickLfConstraint.constant = touchLeftScreenPoint.x ;
         self.leftStickTopStickConstraint.constant = touchLeftScreenPoint.y ;


         [self.leftJoystickView touchesBegan:touches   withEvent:event];
     }else if( [self.rightScreenView pointInside:touchRightScreenPoint withEvent:event] )
     {

         NSLog(@"began click right screen");

         self.rightStickLfConstraint.constant = touchRightScreenPoint.x ;
         self.rightStickTopConstraint.constant = touchRightScreenPoint.y ;
         [self.rightJoystickView touchesBegan:touches withEvent:event];

     }


     NSLog(@"  ");
 } 

移动事件如下:

 -(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
 {
     UITouch *touch = [[event allTouches] anyObject];
     CGPoint touchViewPoint = [touch locationInView:touch.view];

     NSLog(@"moved touch.tapCount:%ld", touch.tapCount);
     NSLog(@"moved touches count:%ld", [touches count]);

     CGPoint  touchLeftScreenPoint = [touch.view convertPoint:touchViewPoint toView:self.leftScreenView];
     CGPoint  touchRightScreenPoint = [touch.view convertPoint:touchViewPoint toView:self.rightScreenView];

     if( [self.leftScreenView pointInside:touchLeftScreenPoint withEvent:event] )
{
         NSLog(@"touchesMoved click left screen");

         [self.leftJoystickView touchesMoved:touches withEvent:event];

     }else if( [self.rightScreenView pointInside:touchRightScreenPoint withEvent:event] )
     {
         NSLog(@"touchesMoved click right screen");

        [self.rightJoystickView touchesMoved:touches withEvent:event];
     }

 }

当我一直在leftScreenView上移动时，再触摸rightScreenView。

我总是触左:1 触右:0。

日志:

 2015-05-08 14:20:30.946 DroneG2[3606:942222] touchesMoved click left screen
 2015-05-08 14:20:30.947 DroneG2[3606:942222] touches count:1
 2015-05-08 14:20:30.962 DroneG2[3606:942222] moved touch.tapCount:1
 2015-05-08 14:20:30.962 DroneG2[3606:942222] moved touches count:1
 2015-05-08 14:20:30.962 DroneG2[3606:942222] touchesMoved click left screen
 2015-05-08 14:20:30.963 DroneG2[3606:942222] touches count:1
 2015-05-08 14:20:30.982 DroneG2[3606:942222] moved touch.tapCount:1
 2015-05-08 14:20:30.982 DroneG2[3606:942222] moved touches count:1
 2015-05-08 14:20:30.983 DroneG2[3606:942222] touchesMoved click left screen
 2015-05-08 14:20:30.983 DroneG2[3606:942222] touches count:1
 2015-05-08 14:20:30.984 DroneG2[3606:942222] touch left:1
 2015-05-08 14:20:30.985 DroneG2[3606:942222] touch right:0

如何在不同的 uiview 上处理多点触控？

我在 viewdidload 中添加了以下内容:

 self.leftScreenView.multipleTouchEnabled = NO;
 self.rightScreenView.multipleTouchEnabled = NO;
 //    self.leftScreenView.exclusiveTouch = NO;
 //    self.rightScreenView.exclusiveTouch = NO;

self.view.multipleTouchEnabled =  YES;

我的 Storyboard截图:

非常感谢。

Answer 1

将 UIGestureRecognizer 添加到 -viewDidLoad 中的每个 View 。使用 UIGestureRecognizer，您可以跟踪手势的状态。例如，您可以使用以下内容。

//Add a gesture recognizer to each view
UIPanGestureRecognizer *panGesture = 
[[UIPanGestureRecognizer alloc] initWithTarget:self                                                                   
                                        action: @selector(handlePan:)];
panGesture.minimumNumberOfTouches = 1;
[self.myView addGestureRecognizer:panGesture];

现在在 -handlePan 中，您可以跟踪包含手势的状态和 View 。

- (void)handlePan:(UIPanGestureRecognizer *)gesture{

    UIView *view = gesture.view; //View that contains gesture

    if(gesture.state == UIGestureRecognizerStateBegan){

    }else if(gesture.state == UIGestureRecognizerStateChanged){

    }else if(gesture.state == UIGestureRecognizerStateEnded){

    }

}

---

编辑:

要区分左 View 和右 View ，您可以为每个 View 添加一个标签。

leftView.tag = 0;
rightView.tag = 1;

然后在-handlePan:

里面

UIView *view = gesture.view; //View that contains gesture

if(view.tag == 0)
   //...

if(view.tag == 1)
   //...

---

编辑2:

您需要将手势添加到左右 View ，而不是 View Controller 的 View 。

- (void)viewDidLoad {
    [super viewDidLoad];
    self.leftScreenView.tag = 0;
    self.rightScreenView.tag = 1;


    UIPanGestureRecognizer *panGesture =
    [[UIPanGestureRecognizer alloc] initWithTarget:self
                                            action: @selector(handlePan:)];
    panGesture.minimumNumberOfTouches = 1;
    [self.leftScreenView addGestureRecognizer:panGesture];

    UIPanGestureRecognizer *panGesture1 =
    [[UIPanGestureRecognizer alloc] initWithTarget:self
                                            action: @selector(handlePan:)];
    panGesture1.minimumNumberOfTouches = 1;
    [self.rightScreenView addGestureRecognizer:panGesture1];

}