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画面に表示された画像を指でドラッグする方法です。

UIImageView クラスを継承した DragView クラスを作成する。

@interface DragView : UIImageView {
	CGPoint startLocation;
}

@end

@implementation DragView

- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event
{
	startLocation = [[touches anyObject] locationInView:self];
	[[self superview] bringSubviewToFront:self];
}

- (void) touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event
{
	CGPoint pt = [[touches anyObject] locationInView:self];
	CGRect frame = [self frame];
	frame.origin.x += pt.x - startLocation.x;
	frame.origin.y += pt.y - startLocation.y;
	[self setFrame:frame];
}

@end;

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