不同uiview中的iOS MultiTouch事件

Posted 2023-03-13

【中文标题】不同uiview中的iOS MultiTouch事件

【英文标题】：iOS MultiTouch Event in different uiview

【发布时间】：2015-05-08 06:28:00

【问题描述】：

我在 UIViewcontroller 上有两个不同的 UIView。

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

它们是区分子视图 leftJoystickView(on leftScreenView) 和 rightJoystickView(on rightScreenView)。

但我发现以下问题：

当我在 leftScreenView 上触摸并移动时，现在我在 rightScreenView 上触摸其他手指。

现在触摸事件总是在 leftScreenView 上。这不能区分 leftScreenView 和 rightScreenView 事件。

我需要触摸 leftScreenView 并且移动和触摸 rightScreenView 移动是不同的事件（移动）。

如何处理多点触控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。

我总是触摸左：1 触摸右：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;

我的故事板截图：

非常感谢。

【问题讨论】：

如果要区分开始和结束，为什么不用UIGestureRecognizer？

因为在开始时，移动和结束在操纵杆上的动作不同。所以我使用了touchbegan。如果使用 UIGestureRecognizer 如何区分不同视图上的触摸开始？谢谢。

您可以查看UIGestureRecognizer的状态。

请问，如果使用 UIGestureRecognizer，addGestureRecognizer:tapGesture 是添加到 self.view 还是 self.leftScreenView 和 self.rightScreenView？谢谢。

您将其添加到特定视图中。所以：self.view.addGestureRecognizer:tapGesture 或 self.leftScreenView.addGestureRecognizer:tapGesture

【参考方案1】：

在-viewDidLoad 内的每个视图中添加UIGestureRecognizer。使用UIGestureRecognizer，您可以跟踪手势的状态。作为示例，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，您可以跟踪包含该手势的状态和视图。

- (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：

要区分左右视图，您可以为每个视图添加tag。

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：

你需要将手势添加到左右视图，而不是视图控制器的视图。

- (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];

【讨论】：

如果使用UIPanGestureRecognizer，如何区分leftScreenView和right ScrrenView应该调用[self.leftJoystickView touchesMoved:touches withEvent:event]; ， 请。谢谢

对不起，我试试你的代码，如果我拖到 tag=0(leftVIew), not touch up(end) 的情况。然后点击右视图，没有显示日志标签=1（右视图）。@@

首先，谢谢。如果我想触摸开始和触摸结束事件，我应该 UITapGestureRecognizer 对吗？ UIPanGestureRecognizer 仅适用于移动情况。

@dickfala 是的，请参阅此处的文档 - developer.apple.com/library/ios/documentation/UIKit/Reference/… 并请接受我的回答）

等我解决我的问题，然后使用您的答案申请我的申请。我会接受你的回答。首先谢谢你。

【参考方案2】：

您可以使用- touchesForView: 或UIEvent 处理这种情况。 - touchesForView: 返回 UITouch 集合。检查返回的集合是否包含leftSideView或RightSideView，如果是则处理移动事件。以下是代码sn-p：

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event

// get the touch set of leftside view
NSSet *eventTouches1 =  [event touchesForView:leftSideView];

// get the touch set of rightside view
NSSet *eventTouches2 =  [event touchesForView:rightSideView];

// check if the eventTouches1 is not null
if (eventTouches1) 
    UITouch *touch1 = [[eventTouches1 allObjects] objectAtIndex:0];
    if ([touch1.view isEqual:leftSideView]) 

        // handle drag event for left side view
    


// check if the eventTouches2 is not null
if (eventTouches2) 
    UITouch *touch2 = [[eventTouches2 allObjects] objectAtIndex:0];
    if ([touch2.view isEqual:rightSideView]) 

        // handle drag event for right side view

    

这也可以通过使用UIGestureRecognizer 来实现。