UIScrollViewDelegate

UIScrollViewDelegate.m

@protocol UIScrollViewDelegate 

@optional 
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView 
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
@end


@interface UIScrollView : UIView 
@property (assign) id <UIScrollViewDelegate> delegate; 
@end


@interface MyViewController : UIViewController <UIScrollViewDelegate> 
... 
@end

MyViewController *myVC = [[MyViewController alloc] init]; 
UIScrollView *scrollView = ...; 
scrollView.delegate=myViewController; //compiler won’t complain