iOS UICollectionView 长按移动item及抖动

#import "CollectionMoveViewController.h"
#import "CollectionViewCell.h"

@interface CollectionMoveViewController ()<UICollectionViewDelegate,UICollectionViewDataSource>
@property(nonatomic,strong)UICollectionView *collectionView;
@property(nonatomic,strong)NSMutableArray *list;
@end
@implementation CollectionMoveViewController
-(NSMutableArray *)list
{
    if (_list == nil) {
        _list = [NSMutableArray arrayWithObjects:@"第一个",@"第二个",@"第三个",@"第四个",@"第五个",@"第六个",@"第七个",@"第八个",@"第九个",@"第十个",nil];
    }
    return _list;
}
- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    
    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc]init];
    // UICollectionViewFlowLayout流水布局的内部成员属性有以下：
    /**
     @property (nonatomic) CGFloat minimumLineSpacing;
     @property (nonatomic) CGFloat minimumInteritemSpacing;
     @property (nonatomic) CGSize itemSize;
     @property (nonatomic) CGSize estimatedItemSize NS_AVAILABLE_IOS(8_0); // defaults to CGSizeZero - setting a non-zero size enables cells that self-size via -preferredLayoutAttributesFittingAttributes:
     @property (nonatomic) UICollectionViewScrollDirection scrollDirection; // default is UICollectionViewScrollDirectionVertical
     @property (nonatomic) CGSize headerReferenceSize;
     @property (nonatomic) CGSize footerReferenceSize;
     @property (nonatomic) UIEdgeInsets sectionInset;
     */
    // 定义大小
    layout.itemSize = CGSizeMake(100, 100);
    // 设置最小行间距
    layout.minimumLineSpacing = 10;
    // 设置垂直间距
    layout.minimumInteritemSpacing = 10;
    // 设置滚动方向（默认垂直滚动）
    layout.scrollDirection = UICollectionViewScrollDirectionVertical;
    
    UICollectionView *collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 0, DZHWidth, DZHHeight) collectionViewLayout:layout];
    self.collectionView = collectionView;
    [self.view addSubview:collectionView];
    self.collectionView.backgroundColor = [UIColor greenColor];
    collectionView.delegate = self;
    collectionView.dataSource = self;
    [collectionView registerNib:[UINib nibWithNibName:@"CollectionViewCell" bundle:nil] forCellWithReuseIdentifier:@"CollectionViewCell"];
    collectionView.pagingEnabled = YES;
    //1.CollectionView 添加长按手势
    UILongPressGestureRecognizer *longTap = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longHandle:)];
    [collectionView addGestureRecognizer:longTap];
    // Do any additional setup after loading the view.

}
//2.长按方法
-(void)longHandle:(UILongPressGestureRecognizer *)gesture
{
    switch (gesture.state) {
        case UIGestureRecognizerStateBegan:
        {
            NSIndexPath *indexPath = [self.collectionView indexPathForItemAtPoint:[gesture locationInView:self.collectionView]];
            if (indexPath == nil) {
                break;
            }
            [self.collectionView beginInteractiveMovementForItemAtIndexPath:indexPath];
            //cell.layer添加抖动手势
            for (CollectionViewCell *cell in [self.collectionView visibleCells]) {
                [self starShake:cell];
            }
            break;
        }
        case UIGestureRecognizerStateChanged:
        {
            [self.collectionView updateInteractiveMovementTargetPosition:[gesture locationInView:self.collectionView]];
            break;
        }
        case UIGestureRecognizerStateEnded:
        {
            
            [self.collectionView endInteractiveMovement];
           //cell.layer移除抖动手势
            for (CollectionViewCell *cell in [self.collectionView visibleCells]) {
                [self stopShake:cell];
            }
            break;
        }
            
        default:
            [self.collectionView cancelInteractiveMovement];
            break;
    }
    
}
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    return 1;
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return self.list.count;
}

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    CollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"CollectionViewCell" forIndexPath:indexPath];
    cell.textLabel.text = self.list[indexPath.row];
    return cell;
}
//3.设置可移动
-(BOOL)collectionView:(UICollectionView *)collectionView canMoveItemAtIndexPath:(NSIndexPath *)indexPath
{
    return YES;
}
//4.移动完成后的方法  －－ 交换数据
-(void)collectionView:(UICollectionView *)collectionView moveItemAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath
{
    [self.list exchangeObjectAtIndex:sourceIndexPath.row withObjectAtIndex:destinationIndexPath.row];
}
- (void)starShake:(CollectionViewCell*)cell{
    
    CAKeyframeAnimation * keyAnimaion = [CAKeyframeAnimation animation];
    keyAnimaion.keyPath = @"transform.rotation";
    keyAnimaion.values = @[@(-3 / 180.0 * M_PI),@(3 /180.0 * M_PI),@(-3/ 180.0 * M_PI)];//度数转弧度
    keyAnimaion.removedOnCompletion = NO;
    keyAnimaion.fillMode = kCAFillModeForwards;
    keyAnimaion.duration = 0.3;
    keyAnimaion.repeatCount = MAXFLOAT;
    [cell.layer addAnimation:keyAnimaion forKey:@"cellShake"];
}
- (void)stopShake:(CollectionViewCell*)cell{
    [cell.layer removeAnimationForKey:@"cellShake"];
}