同时移动2个对象

Question

在我当前的ios项目中，我将屏幕的一侧分配给一个对象，屏幕的另一侧分配给另一个对象，并且我做到了这样，如果您将手指划过指定对象上屏幕的一侧会移动。但是，我想让它能够在不同的运动中同时移动两个物体，但我无法弄清楚如何去做。以下是我目前的代码。

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

    if (location.x <= 270) { 
     [Person setCenter:CGPointMake(location.x, Person.center.y)]; 

    } 
    else { 
     [Person1 setCenter:CGPointMake(location.x, Person1.center.y)]; 
    } 
} 

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

    if (location.x <= 270) { 
     [Person setCenter:CGPointMake(location.x, Person.center.y)]; 
    } 
    else { 
     [Person1 setCenter:CGPointMake(location.x, Person1.center.y)]; 
    } 
} 

Answer 1

你应该开始处理那些在touches套装中提供多点触摸 - 通过所有的UITouch对象环路，做你的处理。

编辑： 这里是你的代码：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { 
    for(UITouch *touch in [event allTouches]) { 
     CGPoint location = [touch locationInView:touch.view]; 

     if (location.x <= 270) { 
      [Person setCenter:CGPointMake(location.x, Person.center.y)]; 
     } 
     else { 
      [Person1 setCenter:CGPointMake(location.x, Person1.center.y)]; 
     } 
    } 
} 

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

     if (location.x <= 270) { 
      [Person setCenter:CGPointMake(location.x, Person.center.y)]; 
     } 
     else { 
      [Person1 setCenter:CGPointMake(location.x, Person1.center.y)]; 
     } 
    } 
} 

Answer 2

如果移动-touchesBegan & touchesMoved代码到人视图类，而不是视图/或的viewController类是在目前那么这些意见可以处理触摸彼此独立并且同时。

*编辑：更多信息： 目前，您正在使用上面粘贴的代码处理触摸事件（我在猜测UIViewController），如果您将该代码移动到您创建的Person类中，您可以使代码更简单并达到你想要的结果。 这会产生这样的效果，即人将决定它是否被触摸以及在哪里移动。

在你Person.m文件中添加以下代码，

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ 
    UITouch *touch = [[event allTouches] anyObject]; 
    CGPoint location = [touch locationInView:self.superview]; 
    [self moveToLocation:location]; 
} 

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ 
    UITouch *touch = [[event allTouches] anyObject]; 
    CGPoint location = [touch locationInView:self.superview]; 
    [self moveToLocation:location]; 
} 

-(void)moveToLocation:(CGPoint)location{ 
    CGFloat halfOfPersonWidth = self.bounds.size.width /2.0f; 
    CGFloat halfOfSuperviewWidth = self.superview.bounds.size.width/2.0f; 

    // Stop Person from going off left screen edge 
    if ((location.x - halfOfPersonWidth) <= 0.0f){ 
     return; 
    } // Stop Person from going off right screen edge 
    else if ((location.x + halfOfPersonWidth) >= self.superview.bounds.size.width){ 
     return; 
    } 

    if (self.center.x < halfOfSuperviewWidth) { 
     // Person is on the left of the screen and should not move to right side 
     if ((location.x + halfOfPersonWidth) > halfOfSuperviewWidth) { 
      return; 
     } 
    } else{ 
     // Person is on the right of the screen and should not move to left side 
     if ((location.x - halfOfPersonWidth) < halfOfSuperviewWidth) { 
      return; 
     } 
    } 
    // If we have made it this far then we can move the Person 
    // move to touch location on x axis only 
    [self setCenter:CGPointMake(location.x, self.center.y)]; 
    } 

现在，在您的视图控制器类，你可以删除原始-touchesBegan您在此处粘贴& -touchesMoved代码，或者只是把它注释掉，如果你要谨慎

/* put slash asterisks above the code and asterisks slash below the code to comment out */ 

如果你建立和运行，你应该能够走动每个人查看过，但如果你把一个手指上的每个人观点的同时，你应该能够将它们同时移动。