StackOverflow2013

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2012-03-22T20:36:53.063
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2012-03-22T20:36:53.063
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For a similar problem, I made UIScrollView subclass like the following: PoliteScrollView passes touch messages to it's subviews when it determines that they are being dragged. <pre><code>@interface PoliteScrollView : UIScrollView // number of pixels perpendicular to the scroll views orientation to make a drag start counting as a subview drag // defaults to 1/10 of the scroll view's width or height, whichever is smaller @property(nonatomic,assign) CGFloat subviewDraggingThreshold; // yes when a subview is being dragged @property(nonatomic,assign) BOOL isDraggingSubview; // the subview being dragged @property(nonatomic,strong) UIView *draggingSubview; @end @protocol PoliteScrollViewDelegate <NSObject> @optional - (void)scrollView:(PoliteScrollView *)scrollView subviewTouchesBegan:(NSSet *)touches; - (void)scrollView:(PoliteScrollView *)scrollView subviewTouchesMoved:(NSSet *)touches; - (void)scrollView:(PoliteScrollView *)scrollView subviewTouchesEnded:(NSSet *)touches; @end </code></pre> The key design idea is that dragging in a scroll view is ambiguous. Is the user scrolling or dragging a subview? PoliteScroll view handles this by providing two things: (1) a notion of orientation (horizontal if it's longer than it is wide, vertical otherwise), and (2) a threshold distance for what constitutes a drag in the direction perpendicular to it's orientation. (defaults to 1/10 the width or height). I pasted this and several other files are in a <a href="http://pastebin.com/LdYjVU7p" rel="nofollow">paste bin</a>, containing the following: <ul> <li>PoliteScrollView .h and .m</li> <li>DraggableImageView.h and .m - that changes it's position when it gets touch messages.</li> <li>ViewController.m - that demonstrates thetwo in combination.</li> </ul> To combine these in a project, paste the paste bin into files appropriately named, add a storyboard with a PoliteScrollView (be sure to set it's delegate), add in some images (the ViewController tries to add puppy0.jpeg to puppy4.jpeg.
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1. POiPhone/iOS: How to implement Drag and Drop for subviews of a Scrollview?
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1. PTAnswer
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1. USdanh
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