ios - ios中collectionview滚动的动画

Question

我有一个 Collection View ，因为我从网络服务加载了 10 张图像。我想将该 ImageView 从第一个位置自动滚动到最后一个位置，然后在该页面出现时连续持续到第一个位置。我使用下面的方法

-(void)scrollSlowly 
{
    CATransition *transition = [CATransition animation];
    transition.duration = 4.0f;
    transition.type = kCATransitionPush;
    transition.subtype = kCATransitionFromLeft;
    [transition setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
    [UIView animateWithDuration:5.0f
                          delay:3.0f
                        options:UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse
                     animations:^{

                         [self.CollectionView setContentOffset:CGPointMake(CGFLOAT_MAX ,0)];

                     }
                     completion:nil];
    [self.CollectionView.layer addAnimation:transition forKey:@"transition"];
}

-(void)scrollSlowlyToPoint 
{
   self.CollectionView.contentOffset = self.scrollingPoint;
    //    Here you have to respond to user interactions or else the scrolling will not stop until it reaches the endPoint.
   if (CGPointEqualToPoint(self.scrollingPoint, self.endPoint))
   {
       [self.scrollingTimer invalidate];
   }
    //    Going one pixel to the right.
   self.scrollingPoint = CGPointMake(self.scrollingPoint.x+1, self.scrollingPoint.y);
}

我想在 Objective-C 中水平自动滚动。提前致谢

Answer 1

创建自定义 UICollectionViewCell 类，创建并连接 ImageView 的 socket 。

在 .h 文件中:

    NSMutableArray *imgArr;
    NSInteger testIndexPath;

我想你可以实现 UICollectionView 的数据源方法。

在将图像添加到 ImageView 后，在 cellForItemAtIndexPath 中添加此行

    testIndexPath=indexPath.row;//this will give you the indexPath for cell

现在将这两个方法添加到您的 .m 文件中:

   -(void)autoScroll{
    CGFloat point = self.collectionVw.contentOffset.x;
    CGFloat lo = point + 1;
    [UIView animateWithDuration:0 delay:0 options:UIViewAnimationOptionCurveEaseIn animations:^{
    self.collectionVw.contentOffset = CGPointMake(lo, 0);
}completion:^(BOOL finished){
    if (testIndexPath==8)
    {
        [self autoScrollReverse];
    }
    else{
      [self autoScroll];
    }
  }];
 }

  -(void)autoScrollReverse{
    CGFloat point = self.collectionVw.contentOffset.x;
    CGFloat lo = point - 1;
    [UIView animateWithDuration:0 delay:0 options:UIViewAnimationOptionCurveEaseIn animations:^{
    self.collectionVw.contentOffset = CGPointMake(lo, 0);
}completion:^(BOOL finished){
    if(testIndexPath == 0){
        [self autoScroll];
    }else{
       [self autoScrollReverse];

    }

  }];
 }

 //Call [self autoScroll] in your viewDidLoad