如何在 -(void)touchesMoved 期间仅调用一次方法？

发布于 2024-08-21 17:43:13 字数 715 浏览 10 评论 0原文

当我进入特定框架（在本例中为按钮区域）时，我使用 - (void)touchesMoved 来执行操作。

我的问题是，我只希望它在我进入框架时执行操作 - 而不是当我在框架内移动手指时。

有谁知道当我在框架内时如何仅调用我的方法一次，并且如果我在同一个 touchMove 中重新输入它，仍然允许我再次调用它。

谢谢。

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [[event touchesForView:self.view] anyObject];

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

    if(CGRectContainsPoint(p1.frame, location))
    {
            //I only want the below to me called 
            // once while I am inside this frame
        [self pP01];
        [p1 setHighlighted:YES];
    }else {
        [p1 setHighlighted:NO];
    }
}

原文

I am using - (void) touchesMoved to do stuff when ever I enter a specific frame, in this case the area of a button.

My problem is, I only want it to do stuff when I enter the frame - not when I am moving my finger inside the frame.

Does anyone know how I can call my methods only once while I am inside the frame, and still allow me to call it once again if I re-enter it in the same touchMove.

Thank you.

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [[event touchesForView:self.view] anyObject];

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

    if(CGRectContainsPoint(p1.frame, location))
    {
            //I only want the below to me called 
            // once while I am inside this frame
        [self pP01];
        [p1 setHighlighted:YES];
    }else {
        [p1 setHighlighted:NO];
    }
}

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我偏爱纯白色 2024-08-28 17:43:13

您可以使用某些属性来检查当您进入特定区域时是否已经调用了该代码。看起来 p1 对象的突出显示状态（不确定它是什么）可能适合于此：

if(CGRectContainsPoint(p1.frame, location))
{
   if (!p1.isHighlighted){ // We entered the area but have not run highlighting code yet
        //I only want the below to me called 
        // once while I am inside this frame
      [self pP01];
      [p1 setHighlighted:YES];
   }
}else { // We left the area - so we'll call highlighting code when we enter next time
    [p1 setHighlighted:NO];
}

You can use some attribute to check if the code was already called when you were entering specific area. It looks like highlighted state of p1 object (not sure what it is) may be appropriate for that:

if(CGRectContainsPoint(p1.frame, location))
{
   if (!p1.isHighlighted){ // We entered the area but have not run highlighting code yet
        //I only want the below to me called 
        // once while I am inside this frame
      [self pP01];
      [p1 setHighlighted:YES];
   }
}else { // We left the area - so we'll call highlighting code when we enter next time
    [p1 setHighlighted:NO];
}

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灰色世界里的红玫瑰 2024-08-28 17:43:13

只需添加一个 BOOL，您在 TouchesMoved 中检查它并在 TouchesEnded 中重置

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壹場煙雨 2024-08-28 17:43:13

if( CGRectContainsPoint([p1 frame],[touch locationInView:self.view])) {
   NSLog (@"Touch Moved over p1");
  if (!p14.isHighlighted) {
   [self action: p1];
   p1.highlighted = YES; 
   }
  }else {
   p1.highlighted = NO;
  }

if( CGRectContainsPoint([p1 frame],[touch locationInView:self.view])) {
   NSLog (@"Touch Moved over p1");
  if (!p14.isHighlighted) {
   [self action: p1];
   p1.highlighted = YES; 
   }
  }else {
   p1.highlighted = NO;
  }

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