iOS UICollectionView 高级用法(长按cell

iOS9 之后

前言: 看完你可以学到哪些呢? 就是文章标题那么多, 只有那么多..手残效果图没弄好.

@property(nonatomic,strong) UICollectionView *xtCollectionView;@property(nonatomic,strong) UICollectionViewFlowLayout *flowLayout;@property(nonatomic,strong) CALayer *dotLayer;@property(nonatomic,assign)CGFloatendPoint_x;@property(nonatomic,assign)CGFloatendPoint_y;@property(nonatomic,strong) UIBezierPath *path;@property(nonatomic,strong)NSMutableArray*array;@property(nonatomic,strong) UILongPressGestureRecognizer *longPress;

 初始化一个数组

self.array= [NSMutableArrayarrayWithObjects:@"红包", @"转账", @"手机充值", @"芝麻信用",                  @"天猫", @"生活缴费", @"蚂蚁呗", @"世界那么大",                  @"余额宝", @"安全快付", @"蚂蚁聚宝", @"哈哈",@"红包1", @"转账1", @"手机充值1", @"芝麻信用1",                  @"天猫1", @"生活缴费1", @"蚂蚁呗1", @"世界那么大1",                  @"余额宝1", @"安全快付1", @"蚂蚁聚宝1", @"哈哈1",nil];

 创建CollectionView

- (UICollectionView*)xtCollectionView{if(!_xtCollectionView) {        _flowLayout = [[UICollectionViewFlowLayoutalloc] init];        _flowLayout.minimumLineSpacing =1;        _flowLayout.minimumInteritemSpacing =1;        _xtCollectionView = [[UICollectionViewalloc]initWithFrame:CGRectMake(0,20,Screen_Width,Screen_Height-20)collectionViewLayout:_flowLayout];        _xtCollectionView.dataSource =self;        _xtCollectionView.backgroundColor = [UIColorcolorWithRed:0.8568green:0.8568blue:0.8568alpha:1.0];        _xtCollectionView.delegate =self;        [_xtCollectionViewregisterClass:[XTCollectCellclass]forCellWithReuseIdentifier:@"cellIdentiifer"];}return_xtCollectionView;}

添加一个长按的手势

_longPress = [[UILongPressGestureRecognizeralloc]initWithTarget:selfaction:@selector(lonePressMoving:)];[self.xtCollectionViewaddGestureRecognizer:_longPress];

手势方法的实现

- (void)lonePressMoving:(UILongPressGestureRecognizer *)longPress{switch(_longPress.state) {caseUIGestureRecognizerStateBegan: {            {NSIndexPath*selectIndexPath = [self.xtCollectionViewindexPathForItemAtPoint:[_longPress locationInView:self.xtCollectionView]];// 找到当前的cellXTCollectCell *cell = (XTCollectCell *)[self.xtCollectionViewcellForItemAtIndexPath:selectIndexPath];// 定义cell的时候btn是隐藏的, 在这里设置为NO[cell.btnDeletesetHidden:NO];                [_xtCollectionView beginInteractiveMovementForItemAtIndexPath:selectIndexPath];            }break;        }caseUIGestureRecognizerStateChanged: {                [self.xtCollectionViewupdateInteractiveMovementTargetPosition:[longPress locationInView:_longPress.view]];break;        }caseUIGestureRecognizerStateEnded: {                [self.xtCollectionViewendInteractiveMovement];break;        }default: [self.xtCollectionViewcancelInteractiveMovement];break;    }}

移动方法

-(void)collectionView:(UICollectionView*)collectionView moveItemAtIndexPath:(nonnull NSIndexPath *)sourceIndexPath toIndexPath:(nonnull NSIndexPath *)destinationIndexPath{NSIndexPath *selectIndexPath = [self.xtCollectionView indexPathForItemAtPoint:[_longPress locationInView:self.xtCollectionView]];// 找到当前的cellXTCollectCell *cell = (XTCollectCell *)[self.xtCollectionView cellForItemAtIndexPath:selectIndexPath];[cell.btnDelete setHidden:YES];[self.array exchangeObjectAtIndex:sourceIndexPath.item withObjectAtIndex:destinationIndexPath.item];[self.xtCollectionView reloadData];}

原文链接点我

效果图的解释: collectionView的可编辑状态是”假的”, 只是对数据进行了处理

你可能想知道动画的实现可以看我的另一篇博客iOS仿美团外卖饿了吗App点餐动画

iOS9 之前

请参照这个1.

Github上很早的项目了, 希望对有需要的同学有启发的作用, 点我下载感谢作者

请参照这个2.

简书上的一篇文章