ios - TouchesMoved 只移动一点点

Question

我试图允许用户在屏幕上拖动标签，但在模拟器中，每次我触摸屏幕上的某个位置时，它只会移动一点。它会跳到该位置，然后稍微拖动，但随后它将停止拖动，我必须触摸不同的位置才能使其再次移动。这是我的 .m 文件中的代码。

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *Drag = [[event allTouches] anyObject];

    firstInitial.center = [Drag locationInView: self.view];

}

我的最终目标是能够在屏幕上拖动三个不同的标签，但我只是想首先解决这个问题。我将非常感谢任何帮助!

谢谢。

Answer 1

尝试使用 UIGestureRecognizer 而不是 -touchesMoved:withEvent:。并实现类似于以下代码的内容。

//Inside viewDidLoad
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(dragonMoved:)];
panGesture.minimumNumberOfTouches = 1;
[self addGestureRecognizer:panGesture];
//**********

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

    CGPoint touchLocation = [gesture locationInView:self];
    static UIView *currentDragObject;

   if(UIGestureRecognizerStateBegan == gesture.state){

        for(DragObect *dragView in self.dragObjects){

            if(CGRectContainsPoint(dragView.frame, touchLocation)){

                currentDragObject = dragView;
                break;
            }
        }


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

        currentDragObject.center = touchLocation;

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

        currentDragObject = nil;

    }

}