ios - 跟随UICollectionViewCell

我有一个由单元格中的UICollectionView按钮填充的UIImagePickerControl，我希望屏幕后面跟随集合视图末尾的单元格，但仍允许用户滚动

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo
{
NSString* imageString = [image toString];
Screen * screen = [[Screen alloc]init];
screen.imageData = imageString;
[self.project.screens addObject:screen];
long long rowid = [self saveNewImageForScreenToDb:screen];
[self updateTitle:@"" atRowId:rowid];
[self updateTask:@"" atRowId:rowid];


[self dismissViewControllerAnimated:_picker completion:^{
    [_collectionView reloadData];

}];

    NSIndexPath * indexPath = [[NSIndexPath alloc]initWithIndex:?];
   [self.collectionView scrollToItemAtIndexPath: indexPath.row =?
                                atScrollPosition:UICollectionViewScrollPositionRight
                                        animated:YES];

}

这是选择器的代码，选择器是我的'UICollectioView'末尾的按钮。我必须插入什么indexPath才能使屏幕滚动到按钮所在的末端

最佳答案

您将选择的图像添加到NSMutableArray中。假设您的数组是imagesArray。将collectionView滚动到NSMutableArray的最后一个对象。尝试在didFinishPickingImage方法下添加此代码。

[_collectionView reloadData];
NSIndexPath *bottomIndexPath=[NSIndexPath indexPathForRow:imagesArray.count-1 inSection:0];
[self.collectionView scrollToItemAtIndexPath: bottomIndexPath atScrollPosition:UICollectionViewScrollPositionRight animated:YES];

关于ios - 跟随UICollectionViewCell，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/28233299/