在編程生成的滾動完成後調用的UIScrollview委託方法

Question

我需要一些幫助，我真的需要知道在執行一些編程生成的滾動之後將調用的UIScrollView委託方法。從this鏈接，我知道我必須努力實現

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView

但之後，我實現它，從NSLog的，我知道，當滾動視圖已經完成這個方法並沒有所謂的的NSLog顯示，後稱這種委託方法，應用程序稱爲

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

，然後再次呼籲scrollViewDidEndScrollingAnimation，回scrollViewDidScroll過很多次，直到滾動真的停下來，我需要一個布爾值設置爲真正做到程序生成的滾動之前，並且需要在滾動後將其錯誤化真的停止。有人能幫我弄清楚這個問題嗎？

這是我的示例代碼中，要做到這一點：

BOOL isScroll; 

- (void)viewDidLoad { 
    isScroll = YES; 
    [self generateScrollProgrammatically]; 
} 

- (void) generateScrollProgrammatically{ 
    //i do some code for scrolling uiscrollview programmatically 
} 

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{ 
    NSLog(@"scrollViewDidScroll"); 

    if (isScroll){ 
     //do something 
    } 

} 

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{ 
    NSLog(@"scrollViewDidEndScrollingAnimation"); 
} 

在這裏，有人告訴我的NSLog：

2012-05-31 09:58:10.583 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.584 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.595 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.596 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.597 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.598 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.611 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.615 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.616 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.617 myApps[1203:fb03] scrollViewDidEndScrollingAnimation 
2012-05-31 09:58:10.631 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.632 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.633 myApps[1203:fb03] scrollViewDidEndScrollingAnimation 
2012-05-31 09:58:10.634 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.635 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.636 myApps[1203:fb03] scrollViewDidEndScrollingAnimation 
2012-05-31 09:58:10.636 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.637 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.638 myApps[1203:fb03] scrollViewDidEndScrollingAnimation 
2012-05-31 09:58:10.640 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.642 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.644 myApps[1203:fb03] scrollViewDidEndScrollingAnimation 
2012-05-31 09:58:10.644 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.645 myApps[1203:fb03] scrollViewDidScroll 
2012-05-31 09:58:10.646 myApps[1203:fb03] scrollViewDidEndScrollingAnimation 

Answer 1

是啊，這一點我也一樣。我能找到解決它的唯一方法是更換：

[scrollView setContentOffset:offset animated:YES]; 

有：

[UIView animateWithDuration:[[UIApplication sharedApplication] statusBarAnimationDuration] 
       animations:^{ scrollView.contentOffset = offset; } 
       completion:^{ [scrollView.delegate scrollViewDidEndScrollingAnimation:scrollView]; }];