当用户滑动滚动时，有没有办法检测或获取通知？ [关闭]

Posted 2023-03-11

【中文标题】当用户滑动滚动时，有没有办法检测或获取通知？ [关闭]

【英文标题】：Is there a way to detect or get a notification when user swipes to scroll? [closed]

【发布时间】：2013-02-27 18:13:58

【问题描述】：

有没有办法在用户滑动滚动时检测或获取通知？ 我在用 (void)scrollViewDidScroll:(UIScrollView *) scrollView; 但我收到错误： 使用未声明的标识符“scrollViewDidScroll” 谁能告诉我为什么？

@daf & H2SO3

 - (void)viewDidLoad

    [super viewDidLoad];

    // setting the color of this view
    self.view.backgroundColor = [UIColor whiteColor];

    //creating scrollview controller
    CGRect scrollViewFrame = [[UIScreen mainScreen]applicationFrame];
    scrollView = [[UIScrollView          alloc]initWithFrame:CGRectMake(self.view.frame.origin.x,self.view.frame.origin.y,self.view.frame.size.width,(self.view.frame.size.height)/3)];
    scrollView.contentSize = CGSizeMake(3200, 4000);
    scrollView.showsHorizontalScrollIndicator = YES;
    scrollView.showsVerticalScrollIndicator = YES;
    scrollView.backgroundColor = [UIColor grayColor];
    scrollView.delegate = self;
    scrollView.directionalLockEnabled = YES;
    [self.view addSubview:scrollView];

    //creating uiimage

    UIImage* image1 = [UIImage imageNamed:@"wallpapers1.jpg"];

    //creating image view

    UIImageView* imageView1 = [[UIImageView alloc]initWithImage:image1];

    imageView1.frame = CGRectMake(1241,0,image1.size.width,image1.size.height);

    [scrollView addSubview:imageView1];
    // [scrollView scrollRectToVisible:CGRectMake(1200, 0, 100, 100) animated:YES];


- (void)scrollViewDidScroll:(UIScrollView *)sender

    ScrollDirection scrollDirection;
    if (self.lastContentOffset > scrollView.contentOffset.x)
        scrollDirection = ScrollDirectionRight;
    else if (self.lastContentOffset < scrollView.contentOffset.x)
        scrollDirection = ScrollDirectionLeft;

    self.lastContentOffset = scrollView.contentOffset.x;

    // do whatever you need to with scrollDirection here.

【问题讨论】：

不，不是缺少任何代码。

发布更多代码让我们真正能够帮助您

设置点击手势识别器。 ***.com/questions/5216413/…

您在发布的代码中哪里得到错误？

@STANGMMX 谢谢你的关心，但你能告诉我scrollViewDidScroll有什么问题吗？

【参考方案1】：

您使用了错误的委托方法。试试这个

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

【讨论】：

我使用相同的委托方法 - (void)scrollViewDidScroll

这与发布的代码有何不同？参数名称可以是任何名称。