從UIScrollView拖動UIImageView到另一個視圖

Question

我有UIScrollView包含許多UIImageViews。我需要從UIScrollView拖動UIImage到另一個視圖。但是我的代碼只在UIScrollView中拖動。我無法將圖像拖到scrollView之外。請幫我..我的代碼..

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

我有意見給你一對夫婦的UI問題，但@Rob是正確的，關鍵給移動視圖層次周圍的外觀是實際在層次結構中移動它。拖動開始時...

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

手勢識別器應保持完好。

Answer 2

一對夫婦的意見：

1. 當拖動它關閉了滾動，你想從滾動視圖中刪除它，並把它添加到，例如，self.view。然後，您會做addSubview並相應地調整座標：

   newCenter = [self.view convertPoint:newCenter fromView:imageView.superview]; 
   [self.view addSubview:imageView]; 
   imageView.center = newCenter; 
   

2. 確保滾動視圖設置clipsToBounds爲NO，這樣你就可以繼續看到它，你將其拖出。

3. 請注意，我已更改此參考imageView.superview而不是滾動視圖。如果您在此處保留了滾動視圖引用，則必須添加條件檢查以確保圖像視圖尚未移出滾動視圖。

Answer 3

這裏是辦法拖

-(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 
      } 
     } 
    }