iOS标签管理

这个是使用UICollectionView 在iOS9之后新加入的一个方法可以很便捷的实现这个功能。

<span style="font-family: Arial, Helvetica, sans-serif;">定义一个全局的cell以及两个数据源数组：</span>

<pre name="code" class="objc">@interface ViewController ()<UICollectionViewDataSource,UICollectionViewDelegate>{       UICollectionViewCell * cell;}@property(nonatomic,retain)UICollectionView *collectionView;@property(nonatomic,strong)NSMutableArray *array1;@property(nonatomic,strong)NSMutableArray *array2;@end

接下来ViewDidload里面

 _array1 = [NSMutableArray array];    _array2 = [NSMutableArray array];        UILabel *lab = [[UILabel alloc]initWithFrame:CGRectMake(0, 64, self.view.bounds.size.width, 30)];    lab.text = @"推荐频道";    lab.backgroundColor = [UIColor yellowColor];    [self.view addSubview:lab];        for (int i = 0; i< 20; i++) {                UIButton *btn1 = [UIButton buttonWithType:UIButtonTypeCustom];        btn1.frame = CGRectMake(0, 0, 50, 50);        [btn1 setTitle:[NSString stringWithFormat:@"A%d",i] forState:UIControlStateNormal];        btn1.userInteractionEnabled = NO;        btn1.backgroundColor = [UIColor redColor];        [_array1 addObject:btn1];    }    for (int i = 15; i <30; i++) {        UIButton *btn2 = [UIButton buttonWithType:UIButtonTypeCustom];        btn2.frame = CGRectMake(0, 0, 50, 50);        [btn2 setTitle:[NSString stringWithFormat:@"B%d",i] forState:UIControlStateNormal];        btn2.userInteractionEnabled = NO;        [_array2 addObject:btn2];    }                //这个用来定义水平滚动还是垂直滚动    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];    [layout setScrollDirection:UICollectionViewScrollDirectionVertical];            _collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 94, self.view.bounds.size.width, self.view.bounds.size.height) collectionViewLayout:layout];    //layout.minimumLineSpacing = 10;    //layout.minimumInteritemSpacing = 10;        //注册Cell，必须要有    [_collectionView registerClass:[UICollectionViewCell class]        forCellWithReuseIdentifier:@"Cell"];           _collectionView.backgroundColor = [UIColor grayColor];    _collectionView.dataSource = self;    _collectionView.delegate = self;            //此处给其增加长按手势，用此手势触发cell移动效果    UILongPressGestureRecognizer *longGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handlelongGesture:)];    [_collectionView addGestureRecognizer:longGesture];            [self.view addSubview:_collectionView];        UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0, 210, self.view.bounds.size.width, 30)];    label.backgroundColor = [UIColor yellowColor];    label.text = @"点击添加";    label.textAlignment = NSTextAlignmentCenter;    //[self.view addSubview:label];

</pre> 然后就是  <span style="background-color: rgb(240, 240, 240);">CollectionView 的代理方法</span><p></p><p></p><pre name="code" class="objc">//Section的个数-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{    return 2;}//Cell的个数-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{    if (section == 0) {        return _array1.count;    }else        return _array2.count;}

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{        //这个cell的标识必须使用上面注册的    static NSString * CellIdentifier = @"Cell";     cell = [collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];    if (!cell) {        cell = [collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];    }            cell.backgroundColor = [UIColor blueColor];           if (indexPath.section == 0) {        [cell addSubview:_array1[indexPath.item]];        return cell;    }else        [cell addSubview:_array2[indexPath.item]];    return cell;        }

//定义每个UICollectionView 的 margin (边缘距离)-(UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section{    //上左下右~    return UIEdgeInsetsMake(5, 5, 99, 5);}//设置每个item水平间距- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section{    return 10;}//设置每个item垂直间距- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section{    return 15;}//允许item移动- (BOOL)collectionView:(UICollectionView *)collectionView canMoveItemAtIndexPath:(NSIndexPath *)indexPath{        return YES;}

//是否可以被选择-(BOOL)collectionView:(UICollectionView *)collectionView shouldSelectItemAtIndexPath:(NSIndexPath *)indexPath{    return YES;}

//UICollectionView被选中时调用的方法-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{     [cell removeFromSuperview];        if (indexPath.section == 0) {                UIButton *bb = _array1[indexPath.item];         [_array1 removeObjectAtIndex:indexPath.item];        [_array2 insertObject:bb atIndex:_array2.count];               [_collectionView reloadData];            }else {                UIButton *cc = _array2[indexPath.item];        [_array2 removeObjectAtIndex:indexPath.item];        [_array1 insertObject:cc atIndex:_array1.count];        [_collectionView reloadData];            }    }

接下来就是最重要的，移动跟替换数据

- (void)handlelongGesture:(UILongPressGestureRecognizer *)longGesture {    //判断手势状态    switch (longGesture.state) {        case UIGestureRecognizerStateBegan:{            //判断手势落点位置是否在路径上            NSIndexPath *indexPath = [self.collectionView indexPathForItemAtPoint:[longGesture locationInView:self.collectionView]];            if (indexPath == nil) {                break;            }            //在路径上则开始移动该路径上的cell            [self.collectionView beginInteractiveMovementForItemAtIndexPath:indexPath];        }            break;        case UIGestureRecognizerStateChanged:            //移动过程当中随时更新cell位置            [self.collectionView updateInteractiveMovementTargetPosition:[longGesture locationInView:self.collectionView]];                        break;        case UIGestureRecognizerStateEnded:            //移动结束后关闭cell移动            [self.collectionView endInteractiveMovement];            break;        default:            [self.collectionView cancelInteractiveMovement];            break;    }}

//移动结束，替换数据-(void)collectionView:(UICollectionView *)collectionView moveItemAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath*)destinationIndexPath {        //两个section        if (sourceIndexPath.section == 0 && destinationIndexPath.section == 1) {        UIButton *bb = _array1[sourceIndexPath.item];        [_array1 removeObjectAtIndex:sourceIndexPath.item];        [_array2 insertObject:bb atIndex:destinationIndexPath.item];            }else if (sourceIndexPath.section == 1 && destinationIndexPath.section == 0) {        UIButton *cc = _array2[sourceIndexPath.item];        [_array2 removeObjectAtIndex:sourceIndexPath.item];        [_array1 insertObject:cc atIndex:destinationIndexPath.item];    }        //同一个section    else if (sourceIndexPath.section == 0 && destinationIndexPath.section == 0) {              UIButton *aa = _array1[sourceIndexPath.item];        [_array1 removeObjectAtIndex:sourceIndexPath.item];        [_array1 insertObject:aa atIndex:destinationIndexPath.item];    }        else {        UIButton *dd = _array2[sourceIndexPath.item];        [_array2 removeObjectAtIndex:sourceIndexPath.item];        [_array2 insertObject:dd atIndex:destinationIndexPath.item];    }   }