ios - 长按模式下的 Collection View 时，如何移动 Collection View 单元格并在 iOS 中重新排列它们？

Question

我创建了一个 UICollectionView View ，我在其中提供类似 iOS 跳板的效果。当我长按我的 UICollectionView 然后他们开始动画并且它工作正常。现在，当我长按单元格并启动动画时，我想将单元格移动到不同的位置并将其保持在那里直到下次我更改它。请告诉我该怎么做？

这是我的单元格动画代码

- (void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer
{
    if (gestureRecognizer.state != UIGestureRecognizerStateEnded) {
        return;
    }
    p = [gestureRecognizer locationInView:self.collection_view];

    NSIndexPath *indexPath = [self.collection_view indexPathForItemAtPoint:p];
    if (indexPath == nil) {
        NSLog(@"couldn't find index path");
    }
    else {
        [[NSUserDefaults standardUserDefaults]setValue:@"yes" forKey:@"longPressed"];
        [self.collection_view reloadData];

    } 
}

CellForItem

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    NSLog(@"arr_album index row");
    BlogAlbumCell  *cell;
    static NSString *identifier = @"UserBlogAlbum";
    cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
    UserAlbum *user_allbum=[arr_userAlbums objectAtIndex:indexPath.row];
    cell.label_blog_name.text=user_allbum.album_name;
    cell.image_blog_image.image = [UIImage imageNamed:@"more.png"];
    [cell.image_blog_image setImageWithURL:[NSURL URLWithString:[IMAGE_BASE_URL stringByAppendingString:user_allbum.album_image]]];
    if([[[NSUserDefaults standardUserDefaults]valueForKey:@"longPressed"] isEqualToString:@"yes"])
    {
        CABasicAnimation* anim = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
        [anim setToValue:[NSNumber numberWithFloat:0.0f]];
        [anim setFromValue:[NSNumber numberWithDouble:M_PI/50]];
        [anim setDuration:0.1];
        [anim setRepeatCount:NSUIntegerMax];
        [anim setAutoreverses:YES];
        cell.layer.shouldRasterize = YES;
        [cell.layer addAnimation:anim forKey:@"SpringboardShake"];
        CGFloat delButtonSize = 20;

        UIButton *delButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, delButtonSize, delButtonSize)];
        delButton.center = CGPointMake(9, 10);
        delButton.backgroundColor = [UIColor clearColor];
        [delButton setImage: [UIImage imageNamed:@"cross_30.png"] forState:UIControlStateNormal];
        [cell addSubview:delButton];
        [delButton addTarget:self action:@selector(deleteRecipe:) forControlEvents:UIControlEventTouchUpInside];
    }
    else if ([[[NSUserDefaults standardUserDefaults]valueForKey:@"singleTap"] isEqualToString:@"yes"])
    { 
        for(UIView *subview in [cell subviews])
        {
            if([subview isKindOfClass:[UIButton class]])
            {
                [subview removeFromSuperview];
            }
            else
            {
                // Do nothing - not a UIButton or subclass instance
            }
        }
        [cell.layer removeAllAnimations];
        // _deleteButton.hidden = YES; 
        // [_deleteButton removeFromSuperview];
    }
        return cell;
}

Answer 1

看看这个拖放 collectionview 项目。 https://github.com/lxcid/LXReorderableCollectionViewFlowLayout