實(shí)現(xiàn)原理

給UICollectionView添加一個(gè)手勢(shì)或者其他方式田弥，在長(zhǎng)按時(shí)手動(dòng)觸發(fā)拖動(dòng)開始涛酗，在移動(dòng)過(guò)程中又要不斷手動(dòng)地更新位置，而在完成時(shí)手動(dòng)觸發(fā)完成操作偷厦，在取消時(shí)也要手動(dòng)觸發(fā)取消移動(dòng)操作商叹。

而要實(shí)現(xiàn)移動(dòng)，必須設(shè)置是否可移動(dòng)只泼。比如我們的demo中第一個(gè)分區(qū)是要求移動(dòng)的剖笙，而第二個(gè)分區(qū)是不允許移動(dòng)的，因此我們需要通過(guò)代理來(lái)設(shè)置是否可移動(dòng)请唱。

在移動(dòng)完成時(shí)弥咪，會(huì)有代理回調(diào)，此時(shí)我們要做的就是交換數(shù)據(jù)源來(lái)更新十绑。

 
// 開始
- (BOOL)beginInteractiveMovementForItemAtIndexPath:(NSIndexPath *)indexPath NS_AVAILABLE_IOS(9_0); 
 
// 更新位置
- (void)updateInteractiveMovementTargetPosition:(CGPoint)targetPosition NS_AVAILABLE_IOS(9_0);
 
// 完成
- (void)endInteractiveMovement NS_AVAILABLE_IOS(9_0);
 
// 取消
- (void)cancelInteractiveMovement NS_AVAILABLE_IOS(9_0);
 


添加長(zhǎng)按手勢(shì)
我們需要將手勢(shì)放到CollectionView上聚至，因?yàn)槲覀円氖遣僮魅秶模? 
self.collectionView.pagingEnabled = NO;
    
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(onLongPressed:)];
[self.collectionView addGestureRecognizer:longPress];


手勢(shì)方法
- (void)onLongPressed:(UILongPressGestureRecognizer *)sender {
  CGPoint point = [sender locationInView:sender.view];
  NSIndexPath *indexPath = [self.collectionView indexPathForItemAtPoint:point];
  
  // 只允許第一區(qū)可移動(dòng)
  if (indexPath.section != 0) {
    return;
  }
  
  switch (sender.state) {
    case UIGestureRecognizerStateBegan: {
      if (indexPath) {
        [self.collectionView beginInteractiveMovementForItemAtIndexPath:indexPath];
      }
      break;
    }
    case UIGestureRecognizerStateChanged: {
        [self.collectionView updateInteractiveMovementTargetPosition:point];
      break;
    }
    case UIGestureRecognizerStateEnded: {
      [self.collectionView endInteractiveMovement];
      break;
    }
    default: {
      [self.collectionView cancelInteractiveMovement];
      break;
    }
  }
}


是否允許移動(dòng)

- (BOOL)collectionView:(UICollectionView *)collectionView canMoveItemAtIndexPath:(NSIndexPath *)indexPath {
  if (self.isEditing && indexPath.section == 0) {
    return YES;
  }
  
  return NO;
}

完成移動(dòng)更新源

- (void)collectionView:(UICollectionView *)collectionView moveItemAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath {
  if (sourceIndexPath.section == 0 && destinationIndexPath.section == 0) {
    [self.firstList exchangeObjectAtIndex:sourceIndexPath.item withObjectAtIndex:destinationIndexPath.item];
  }
}
 

添加刪除移動(dòng)效果

#pragma mark - UICollectionViewDelegate
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
  if (indexPath.section == 0) {
    if (self.isEditing) {
      TestModel *model = [self.secondList hyb_objectAtIndex:indexPath.item];
      [self.firstList addObject:model];
      [self.secondList removeObject:model];
      
      NSInteger index = self.firstList.count - 1;
      if (self.firstList.count == 0) {
        index = 0;
      }
      
      TestColumnCell *cell = (TestColumnCell *)[collectionView cellForItemAtIndexPath:indexPath];
      cell.isEditing = NO;
      [collectionView moveItemAtIndexPath:indexPath toIndexPath:[NSIndexPath indexPathForItem:index inSection:1]];
      [self saveColumns];
    } else {
      // 選擇某一個(gè)
    }
  } else {
    TestModel *model = [self.firstList hyb_objectAtIndex:indexPath.item];
    [self.secondList addObject:model];
    [self.firstList removeObject:model];
    
    NSInteger index = self.secondList.count - 1;
    if (self.secondList.count == 0) {
      index = 0;
    }
 
    if (self.isEditing) {
      TestColumnCell *cell = (TestColumnCell *)[collectionView cellForItemAtIndexPath:indexPath];
      cell.isEditing = YES;
    }
    
    [collectionView moveItemAtIndexPath:indexPath toIndexPath:[NSIndexPath indexPathForItem:index inSection:0]];
    [self saveColumns];
  }
  
  [collectionView reloadData];
}