UITableVewCell的移动删除

最新推荐文章于 2018-02-22 15:09:34 发布

原创最新推荐文章于 2018-02-22 15:09:34 发布 · 346 阅读

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本文介绍了一个自定义UITableViewCell类实现侧滑删除功能的方法。通过添加长按手势并根据手势状态进行不同操作，如开始时旋转cell，移动过程中捕获快照，结束时根据坐标值决定是否触发删除回调。

如何实现UITableViewCell的侧滑删除功能呢?很简单的思路

给cell添加一个长按手势,然后根据手势的状态,在开始的时候给旋转三十度

在移动过程中,捕获快照

在结束的时候判断坐标值,给VIewController发一个删除cell的回调,同时TableView reloadData就可以了

@interface CustomTableViewCell ()
{
    UIView *snapView;
}
@end

@implementation CustomTableViewCell

- (void)awakeFromNib {
    _containerView.layer.cornerRadius=4;
    
    _shadowView.layer.shadowColor=[UIColor blackColor].CGColor;
    _shadowView.layer.shadowOffset=CGSizeMake(2, 2);
    _shadowView.layer.shadowOpacity=0.5;
    _shadowView.layer.shadowRadius=5;
    
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongpressGesture:)];
    [self.contentView addGestureRecognizer:longPress];

}

- (void)handleLongpressGesture:(UILongPressGestureRecognizer *)gesture
{
    
    CGPoint startPoint = CGPointZero;
    switch (gesture.state) {
        case UIGestureRecognizerStateBegan:
        {
            snapView = [_containerView snapshotViewAfterScreenUpdates:NO];
            startPoint = [gesture locationInView:self.contentView];
            //重设layer锚点
            snapView.layer.anchorPoint = CGPointMake(startPoint.x/snapView.layer.frame.size.width-0.1, startPoint.y/snapView.layer.frame.size.height-0.1);
            snapView.frame = _containerView.frame;
            snapView.transform = CGAffineTransformMakeRotation(M_PI/30);
            [self.contentView addSubview:snapView];
             self.containerView.hidden = YES;
            self.shadowView.hidden = YES;
            break;
        }
        case UIGestureRecognizerStateChanged:
        {
            CGPoint changePoint = [gesture locationInView:self.contentView];
            [UIView animateWithDuration:0.05 animations:^{
                snapView.layer.position = changePoint;
            }];
            break;
        }
        case UIGestureRecognizerStateEnded:
        {
            NSLog(@"ended");
            CGPoint endPoint = [gesture locationInView:self.contentView];
            if (endPoint.x>self.contentView.bounds.size.width-50) {
                if (self.cellBlock) {
                    self.cellBlock(YES, _cellIndex);
                }
            }else
            {
                if (self.cellBlock) {
                    self.cellBlock(NO, _cellIndex);
                }
            }
            [snapView removeFromSuperview];
            self.containerView.hidden = NO;
            self.shadowView.hidden = NO;
            
            
            break;
        }
        default:
            break;
    }
}

ViewController

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    CustomTableViewCell *cell = (CustomTableViewCell *)[tableView dequeueReusableCellWithIdentifier:@"customCell"];
    cell.cellIndex = indexPath;
    cell.cellBlock = ^(BOOL isDelete, NSIndexPath *index){
        if (isDelete) {
            
            [_mTableView beginUpdates];
            rowCount--;
            [_mTableView deleteRowsAtIndexPaths:@[index] withRowAnimation:UITableViewRowAnimationRight];
            [_mTableView endUpdates];
            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
                [_mTableView reloadData];
            });
           
        }
    };
    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    return cell;
}

运行结果