Ios 手指松脱事件

我在

情节提要

中的

UIViewcontroller

上有5个图像。五幅图像中的四幅可以用手指在屏幕上移动（图1、2、3、4）。然后我创建了一个if语句：如果我将其中一个图像拖到固定的图像（最终图形）上，标签上会出现“text”。我在声明中写道。唯一的问题是标签上的文本在两个图像截获时立即出现。但是我想让它在用户移除手指“放下”图像时出现。我该怎么做

代码如下：

//image movement
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

   UITouch *touch = [[event allTouches] anyObject];

   if ([touch view] == graph1) {
      CGPoint location = [touch locationInView:self.view];
      graph1.center = location;
      [self interceptofgraphs]; 
   }

   if ([touch view] == graph2) {
      CGPoint location = [touch locationInView:self.view];
      graph2.center = location;
     [self interceptofgraphs];
   }

   if ([touch view] == graph3) {
      CGPoint location = [touch locationInView:self.view];
      graph3.center = location;
      [self interceptofgraphs];
   }

   if ([touch view] == graph4) {
      CGPoint location = [touch locationInView:self.view];
      graph4.center = location;
      [self interceptofgraphs];
   }
}

-(void)interceptofgraphs {

   if (CGRectIntersectsRect(graph2.frame, finalgraph.frame))
      graphlabel.text = [NSString stringWithFormat: @"Right answer. Well done!!"];

   if (CGRectIntersectsRect(graph1.frame, finalgraph.frame))
      graphlabel.text = [NSString stringWithFormat: @"Wrong!! not at all."];

   if (CGRectIntersectsRect(graph3.frame, finalgraph.frame))
      graphlabel.text = [NSString stringWithFormat: @"Wrong!! Try again"];

   if (CGRectIntersectsRect(graph4.frame, finalgraph.frame))
       graphlabel.text = [NSString stringWithFormat: @"Wrong!! NO"];
}

谢谢你们所有的回答

这应该有效：

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

  UITouch *touch = [[event allTouches] anyObject];

  //we'll almost certainly need a location of touch
  CGPoint location = [touch locationInView:self.view];

  //we store the reference of a view that was touched into touchedView
  UIView *touchedView = [touch view];

  //if view that was touched is one of the views we're interested in
  if ((touchedView == graph1)||(touchedView == graph2)||
      (touchedView == graph3)||(touchedView == graph4)) {

    //we move it's center
    //since the touchedView hold's a reference to the view that
    //was touched - we're moving the right view for sure
    touchedView.center = location;    
  }
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

  //we only want to check whitch view was moved at the end 
  //when user releases the touch
  [self interceptofgraphs];
}

这应该起作用：

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

  UITouch *touch = [[event allTouches] anyObject];

  //we'll almost certainly need a location of touch
  CGPoint location = [touch locationInView:self.view];

  //we store the reference of a view that was touched into touchedView
  UIView *touchedView = [touch view];

  //if view that was touched is one of the views we're interested in
  if ((touchedView == graph1)||(touchedView == graph2)||
      (touchedView == graph3)||(touchedView == graph4)) {

    //we move it's center
    //since the touchedView hold's a reference to the view that
    //was touched - we're moving the right view for sure
    touchedView.center = location;    
  }
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

  //we only want to check whitch view was moved at the end 
  //when user releases the touch
  [self interceptofgraphs];
}

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重新标记；不是XCode问题。XCode只是IDE，这个问题与此无关；不是XCode问题。XCode只是IDE，这个问题与此无关。@Alessandro:添加了一些comments@Alessandro：添加了一些注释