// 长按手势
UILongPressGestureRecognizer * listLongPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(listLongPressAction:)];
[self.collectionViewaddGestureRecognizer:listLongPress];
- (void)listLongPressAction:(UIGestureRecognizer*)gesture
{
UIGestureRecognizerState state = gesture.state;
CGPointlocation = [gesturelocationInView:self.collectionView];
switch(state) {
///手势开始
case UIGestureRecognizerStateBegan:
{
/* 判断手势落点位置是否在路径上 */
NSIndexPath *indexPath = [self.collectionViewindexPathForItemAtPoint:location];
if(indexPath ==nil) {
break;
}
/* 在路径上则开始移动该路径上的cell */
[self.collectionView beginInteractiveMovementForItemAtIndexPath:indexPath];
FileScanGridCell *nCell = (FileScanGridCell*)[self.collectionView cellForItemAtIndexPath:indexPath];
[UIView animateWithDuration:0.35 animations:^{
nCell.alpha=0.6;
}];
break;
}
///手势变化
case UIGestureRecognizerStateChanged:
{
/* 移动过程当中随时更新cell位置 */
[self.collectionView updateInteractiveMovementTargetPosition:location];
break;
}
case UIGestureRecognizerStateEnded:
{
/* 移动结束后关闭cell移动 */
[self.collectionView endInteractiveMovement];
NSIndexPath *indexPath = [self.collectionViewindexPathForItemAtPoint:location];
if(indexPath ==nil) {
break;
}
FileScanGridCell *nCell = (FileScanGridCell*)[self.collectionView cellForItemAtIndexPath:indexPath];
[UIView animateWithDuration:0.35 animations:^{
nCell.alpha=1;
}];
break;
}
///手势结束
default:
{
[self.collectionView cancelInteractiveMovement];
NSIndexPath *indexPath = [self.collectionViewindexPathForItemAtPoint:location];
if(indexPath ==nil) {
break;
}
FileScanGridCell *nCell = (FileScanGridCell*)[self.collectionView cellForItemAtIndexPath:indexPath];
[UIView animateWithDuration:0.35 animations:^{
nCell.alpha=1;
}];
break;
}
}
}
//允许移动的item
- (BOOL)collectionView:(UICollectionView*)collectionViewcanMoveItemAtIndexPath:(NSIndexPath*)indexPath {
return YES;
}
//对交换过的item数据进行操作
- (void)collectionView:(UICollectionView*)collectionViewmoveItemAtIndexPath:(NSIndexPath*)sourceIndexPathtoIndexPath:(NSIndexPath*)destinationIndexPath {
if(sourceIndexPath.row== destinationIndexPath.row) {
return;
}elseif(sourceIndexPath.row> destinationIndexPath.row) {
LYFileInfoModel*model =self.dataArray[sourceIndexPath.row];
[self.dataArrayremoveObjectAtIndex:sourceIndexPath.row];
[self.dataArrayinsertObject:modelatIndex:destinationIndexPath.row];
}elseif(sourceIndexPath.row< destinationIndexPath.row) {
LYFileInfoModel*model =self.dataArray[sourceIndexPath.row];
[self.dataArrayinsertObject:modelatIndex:destinationIndexPath.row+1];
[self.dataArrayremoveObjectAtIndex:sourceIndexPath.row];
}
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
// 需要延迟执行的代码
[self.collectionView reloadData];
});
}
//抑制item移动 指定位置禁止交换
- (NSIndexPath *)collectionView:(UICollectionView *)collectionView targetIndexPathForMoveOfItemFromOriginalIndexPath:(NSIndexPath *)originalIndexPath atCurrentIndexPath:(NSIndexPath *)currentIndexPath toProposedIndexPath:(NSIndexPath *)proposedIndexPath {
returnproposedIndexPath;
}
