Question

我有UIScrollView包含许多UIImageViews。我需要将UIImage从UIScrollView拖到另一个视图。但我的代码只在UIScrollView中拖动。我无法将图像拖到scrollView外部。请帮帮我..我的代码是......

for (int i = 0; i < [myArray count]; i++) {
  image = [[UIImageView alloc]initWithFrame:CGRectMake(0, y, 75, 30)];
  image.userInteractionEnabled = YES;
  image.backgroundColor = [UIColor blueColor];

  UIPanGestureRecognizer *panRecg = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(labelDragged:)];
  [image addGestureRecognizer:panRecg];
  y=y+35;

  [gScrollView addSubview:image];
}

-(void)labelDragged:(UIPanGestureRecognizer *)recognizer {
  UIImageView *imageView = (UIImageView *)recognizer.view;
  CGPoint newCenter = [recognizer translationInView:self.view];

  if([recognizer state] == UIGestureRecognizerStateBegan) {     
    beginX = imageView.center.x; 
    beginY = imageView.center.y;
  }

  newCenter = CGPointMake(beginX + newCenter.x, beginY + newCenter.y);

  [imageView setCenter:newCenter];
}

Answer 1

有几点意见：

将其从滚动视图中拖出时，您希望将其从滚动视图中删除并将其添加到例如self.view。然后，您将执行addSubview并相应地调整坐标：
```
newCenter = [self.view convertPoint:newCenter fromView:imageView.superview];
[self.view addSubview:imageView];
imageView.center = newCenter;
```
确保将滚动视图的clipsToBounds设置为NO，以便在拖动时继续查看。
注意，我已将此更改为引用imageView.superview而不是滚动视图。如果在那里保留scrollview引用，则必须添加条件检查以确保图像视图尚未从滚动视图移开。

Answer 2

我在评论中为您提供了几个UI问题，但@Rob是正确的，即在层次结构中移动视图的外观的关键是实际在层次结构中移动它。拖动开始时......

CGRect newFrame = [gScrollView convertRect:imageView.frame toView:self.view];
imageView.frame = newFrame;
[self.view addSubview:imageView];

手势识别器应保持完整。

Answer 3

以下是拖动

的方法

-(void)labelDragged:(UIPanGestureRecognizer *)recognizer {

{
        UIImageView *imageView=(UIButton *)[recognizer view];
        CGPoint newCenter = [recognizer translationInView:self.view];
        if (recognizer.state==UIGestureRecognizerStateBegan) {
            CGRect rect=[self.view convertRect:[imageView frame] fromView:[imageView superview]];
            beginX = imageView.center.x; 
            beginY = imageView.center.y;
            [vew setFrame:rect];
            [self.view addSubview:vew];
        }
        else
        {
            CGRect rect=imageView.frame;
            newCenter.x=(newCenter.x+Begin.x);
            newCenter.y=(newCenter.y+Begin.y);
            imageView.center=newCenter;
            if (CGRectIntersectsRect(rect, [AcceptingView frame])) {
                [AcceptingView setBackgroundColor:[UIColor lightGrayColor]];//Notifying that the AcceptingView will accept the icon
            }
            else
            {
                //change back to old color
            }
        }
        if (recognizer.state==UIGestureRecognizerStateEnded)
        {
            CGRect rect=[imageView frame];
            if (CGRectIntersectsRect(rect, [AcceptingView frame])) {
                  //your method of adding the Image to acceptView
                 CGRect rect=[acceptView bounds];
                 rect.size=imageView.frame.size;
                 imageView.frame=rect;
                 [AcceptingView addSubView:imageView];
            }
            else//else part is means for if user drop the dragged view somewhere else other than AcceptingView
            {
                   //add image back to scrollView
            }
        }
    }

将UIImageView从UIScrollView拖到另一个视图

3 个答案: