兩個UIScrollVIew可以同步滾動

jiffywang ： 把scrollview的delegate設置成viewcontroller:

1. - (void)scrollViewDidScroll:(UIScrollView *)scrollView {

2.  CGPoint offset = scrollViewB.contentOffset;

3.  offset.y = scrollViewA.contentOffset.y;

4.  [scrollViewB setContentOffset:offset];

5. }

6. 
   

7. - (void)scrollViewDidScroll:(UIScrollView *)scrollView {

8.  if([scrollView isEqual:scrollViewA]) {

9.    CGPoint offset = scrollViewB.contentOffset;

10.    offset.y = scrollViewA.contentOffset.y;

11.    [scrollViewB setContentOffset:offset];

12.  } else {

13.    CGPoint offset = scrollViewA.contentOffset;

14.    offset.y = scrollViewB.contentOffset.y;

15.    [scrollViewA setContentOffset:offset];

16.  }

17. }

18. 
    

19. - (void)matchScrollView:(UIScrollView *)first toScrollView:(UIScrollView *)second {

20.  CGPoint offset = first.contentOffset;

21.  offset.y = second.contentOffset.y;

22.  [first setContentOffset:offset];

23. }

24. 
    

25. - (void)scrollViewDidScroll:(UIScrollView *)scrollView {

26.  if([scrollView isEqual:scrollViewA]) {

27.    [self matchScrollView:scrollViewB toScrollView:scrollViewA];  

28.  } else {

29.    [self matchScrollView:scrollViewA toScrollView:scrollViewB];  

30.  }

31. }