UItableView長ドラッグ順ソート(同業者高、異なるsection間交換をサポート)

効果図:
DHDragableCellTableView.gif
githubダウンロードアドレス:DHDragableCellTable View
使用
DHDragableCellTableViewにtableViewを継承し、DHDragableCellTableView Data Source、DHDragableCellTableView Delegateに準拠

#pragma mark - DHDragableCellTableViewDataSource
- (NSArray *)dataSourceArrayInTableView:(DHDragableCellTableView *)tableView{
    return self.dataSource.copy;//   
}

- (void)tableView:(DHDragableCellTableView *)tableView newDataSourceArrayAfterMove:(NSArray *)newDataSourceArray{
    self.dataSource = newDataSourceArray.mutableCopy;//      
    [self.tableView reloadData];
}

実装:
大まかな考え方では、UItable Viewにロングプッシュジェスチャーを追加し、ロングプッシュ後に選択したcellのスクリーンショットを与え、選択したcellを隠し、スクリーンショットをジェスチャーに従って移動させる.
1.ジェスチャーを追加

/**
     
 */
- (void)dh_addGesture
{
    _gesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(dh_processGesture:)];
    _gesture.minimumPressDuration = _gestureMinimumPressDuration;
    [self addGestureRecognizer:_gesture];
}

2.リスニングジェスチャーの状態

- (void)dh_processGesture:(UILongPressGestureRecognizer *)gesture
{
    switch (gesture.state) {
        case UIGestureRecognizerStateBegan:
        {
            [self dh_gestureBegan:gesture];
        }
            break;
        case UIGestureRecognizerStateChanged:
        {
            if (!_canEdgeScroll) {
                [self dh_gestureChanged:gesture];
            }
        }
            break;
        case UIGestureRecognizerStateEnded:
        case UIGestureRecognizerStateCancelled:
        {
            [self dh_gestureEndedOrCancelled:gesture];
        }
            break;
        default:
            break;
    }
}

3.ドラッグ開始

- (void)dh_gestureBegan:(UILongPressGestureRecognizer *)gesture
{
    CGPoint point = [gesture locationInView:gesture.view];
    self.lastPoint = point;
    NSIndexPath *selectedIndexPath = [self indexPathForRowAtPoint:point];
    if (!selectedIndexPath) {
        return;
    }
    if (self.delegate && [self.delegate respondsToSelector:@selector(tableView:willMoveCellAtIndexPath:)]) {
        [self.delegate tableView:self willMoveCellAtIndexPath:selectedIndexPath];
    }
    if (_canEdgeScroll) {
        //      
        [self dh_startEdgeScroll];
    }
    //             
    if (self.dataSource && [self.dataSource respondsToSelector:@selector(dataSourceArrayInTableView:)]) {
        _tempDataSource = [self.dataSource dataSourceArrayInTableView:self].mutableCopy;
    }
    _selectedIndexPath = selectedIndexPath;
    UITableViewCell *cell = [self cellForRowAtIndexPath:selectedIndexPath];
    _tempView = [self dh_snapshotViewWithInputView:cell];
    if (_drawMovalbeCellBlock) {
        // _tempView  block       
        _drawMovalbeCellBlock(_tempView);
    }else {
        //      
        _tempView.layer.shadowColor = [UIColor grayColor].CGColor;
        _tempView.layer.masksToBounds = NO;
        _tempView.layer.cornerRadius = 0;
        _tempView.layer.shadowOffset = CGSizeMake(-5, 0);
        _tempView.layer.shadowOpacity = 0.4;
        _tempView.layer.shadowRadius = 5;
    }
    _tempView.frame = cell.frame;
    [self addSubview:_tempView];
    //  cell
    cell.hidden = YES;
    [UIView animateWithDuration:kDH_DragableCellAnimationTime animations:^{
        _tempView.center = CGPointMake(_tempView.center.x, point.y);
    }];
}

4.ここをドラッグ_toBottomはintタイプでジェスチャーがどの方向にドラッグされているかを判断し、ドラッグされたcellと交換するcellの中心点を比較して交換するかどうかを判断します

- (void)dh_gestureChanged:(UILongPressGestureRecognizer *)gesture
{
    CGPoint point = [gesture locationInView:gesture.view];
    //       
    if (point.y - self.lastPoint.y > 0) {
        _toBottom = 1;//   
    }else if(point.y - self.lastPoint.y < 0){
        _toBottom = -1;//   
    }else{
        _toBottom = 0;
    }
    self.lastPoint = point;
    NSIndexPath *currentIndexPath = [self indexPathForRowAtPoint:point];
    if (currentIndexPath && ![_selectedIndexPath isEqual:currentIndexPath]) {
        UITableViewCell *cell = [self cellForRowAtIndexPath:_selectedIndexPath];
        UITableViewCell *cell1 = [self cellForRowAtIndexPath:currentIndexPath];
        //    cell     cell centerY    
        if ((_toBottom == 1 && (point.y+cell.frame.size.height/2) >= CGRectGetMaxY(cell1.frame) && (CGRectGetMaxY(cell1.frame) >= CGRectGetMaxY(cell.frame))) || ((_toBottom == -1 && (point.y-cell.frame.size.height/2) <= CGRectGetMinY(cell1.frame)) && (CGRectGetMinY(cell1.frame) <= CGRectGetMinY(cell.frame)))) {
            //      cell
            [self dh_updateDataSourceAndCellFromIndexPath:_selectedIndexPath toIndexPath:currentIndexPath];
            if (self.delegate && [self.delegate respondsToSelector:@selector(tableView:didMoveCellFromIndexPath:toIndexPath:)]) {
                [self.delegate tableView:self didMoveCellFromIndexPath:_selectedIndexPath toIndexPath:currentIndexPath];
            }
            _selectedIndexPath = currentIndexPath;
        }
    }
    //       
    _tempView.center = CGPointMake(_tempView.center.x, point.y);
}

5.交換データとcellの位置異なる行高の交換時にcellが変形しないように、交換後すぐにreloadDataをリリースし、2つのcellをスクリーンショットして、スクリーンショットで交換のアニメーションをシミュレートする

/**
         cell   
 */
- (void)dh_updateDataSourceAndCellFromIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
    if ([self numberOfSections] == 1) {
        //    
        [_tempDataSource exchangeObjectAtIndex:fromIndexPath.row withObjectAtIndex:toIndexPath.row];
        //  cell
        [self moveRowAtIndexPath:fromIndexPath toIndexPath:toIndexPath];
    }else {
        //   
        id fromData = _tempDataSource[fromIndexPath.section][fromIndexPath.row];
        id toData = _tempDataSource[toIndexPath.section][toIndexPath.row];
        NSMutableArray *fromArray = [_tempDataSource[fromIndexPath.section] mutableCopy];
        NSMutableArray *toArray = [_tempDataSource[toIndexPath.section] mutableCopy];
        [fromArray replaceObjectAtIndex:fromIndexPath.row withObject:toData];
        [toArray replaceObjectAtIndex:toIndexPath.row withObject:fromData];
        [_tempDataSource replaceObjectAtIndex:fromIndexPath.section withObject:fromArray];
        [_tempDataSource replaceObjectAtIndex:toIndexPath.section withObject:toArray];
        //  cell
        [self beginUpdates];
        
        [self moveRowAtIndexPath:fromIndexPath toIndexPath:toIndexPath];
        [self moveRowAtIndexPath:toIndexPath toIndexPath:fromIndexPath];
        [self endUpdates];
    }
    //      reloadData
    [self reloadData];
    //         
    if (self.dataSource && [self.dataSource respondsToSelector:@selector(tableView:newDataSourceArrayAfterMove:)]) {
        [self.dataSource tableView:self newDataSourceArrayAfterMove:_tempDataSource.copy];
    }
    //     cell          
    UITableViewCell *cell = [self cellForRowAtIndexPath:fromIndexPath];
    cell.hidden = NO;
    UITableViewCell *cell1 = [self cellForRowAtIndexPath:toIndexPath];
    cell1.hidden = YES;
    UIView *tmpCell = [self dh_snapshotViewWithInputView:cell];
    cell.hidden = YES;
    tmpCell.frame = cell1.frame;
    if (_toBottom == -1) {//  
        tmpCell.frame = CGRectMake(0, CGRectGetMinY(cell1.frame), cell.frame.size.width, cell.frame.size.height);
        [self insertSubview:tmpCell belowSubview:_tempView];
    }else if (_toBottom == 1) {//  
        tmpCell.frame = CGRectMake(0, CGRectGetMaxY(cell1.frame)-cell.frame.size.height, cell.frame.size.width, cell.frame.size.height);
        [self insertSubview:tmpCell belowSubview:_tempView];
    }else{
    }
    
    [UIView animateWithDuration:0.2 animations:^{
        tmpCell.frame = cell.frame;
    }completion:^(BOOL finished) {
        cell.hidden = NO;
        [tmpCell removeFromSuperview];
    }];
}

6.エッジスクロール処理

- (void)dh_startEdgeScroll
{
    _edgeScrollTimer = [CADisplayLink displayLinkWithTarget:self selector:@selector(dh_processEdgeScroll)];
    [_edgeScrollTimer addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
}

- (void)dh_processEdgeScroll
{
    [self dh_gestureChanged:_gesture];
    CGFloat minOffsetY = self.contentOffset.y + _edgeScrollRange;
    CGFloat maxOffsetY = self.contentOffset.y + self.bounds.size.height - _edgeScrollRange;
    CGPoint touchPoint = _tempView.center;
    //              tableView，              ，    edgeScrollRange ，  tableView     ，     tableView     
    if (touchPoint.y < _edgeScrollRange) {
        if (self.contentOffset.y <= 0) {
            return;
        }else {
            if (self.contentOffset.y - 1 < 0) {
                return;
            }
            [self setContentOffset:CGPointMake(self.contentOffset.x, self.contentOffset.y - 1) animated:NO];
            _tempView.center = CGPointMake(_tempView.center.x, _tempView.center.y - 1);
        }
    }
    if (touchPoint.y > self.contentSize.height - _edgeScrollRange) {
        if (self.contentOffset.y >= self.contentSize.height - self.bounds.size.height) {
            return;
        }else {
            if (self.contentOffset.y + 1 > self.contentSize.height - self.bounds.size.height) {
                return;
            }
            [self setContentOffset:CGPointMake(self.contentOffset.x, self.contentOffset.y + 1) animated:NO];
            _tempView.center = CGPointMake(_tempView.center.x, _tempView.center.y + 1);
        }
    }
    //    
    CGFloat maxMoveDistance = 20;
    if (touchPoint.y < minOffsetY) {
        //cell     
        CGFloat moveDistance = (minOffsetY - touchPoint.y)/_edgeScrollRange*maxMoveDistance;
        [self setContentOffset:CGPointMake(self.contentOffset.x, self.contentOffset.y - moveDistance) animated:NO];
        _tempView.center = CGPointMake(_tempView.center.x, _tempView.center.y - moveDistance);
    }else if (touchPoint.y > maxOffsetY) {
        //cell     
        CGFloat moveDistance = (touchPoint.y - maxOffsetY)/_edgeScrollRange*maxMoveDistance;
        [self setContentOffset:CGPointMake(self.contentOffset.x, self.contentOffset.y + moveDistance) animated:NO];
        _tempView.center = CGPointMake(_tempView.center.x, _tempView.center.y + moveDistance);
    }
}