使用CollectionView實現(xiàn)Item不同Section間的移動奶躯、拖拽

廢話不多說直接上代碼了，其核心實現(xiàn)代碼就是在-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath方法中的代碼

#import "MyChannelView.h"http://本類
#import "MyChannelCollectionViewCell.h"http:// 自定義cell

#define  MyChannelCollectionViewCellID  @"MyChannelCollectionViewCellID"

@interface MyChannelView ()<UICollectionViewDelegate,UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>

@property (nonatomic,strong) UICollectionView *myChannelCollectionView;
@property (nonatomic,strong) NSMutableArray *selectedArray;// 0區(qū)數(shù)據(jù)源
@property (nonatomic,strong) NSMutableArray *deselectedArray;// 1區(qū)數(shù)據(jù)源
@property (nonatomic,strong) NSArray *allArray;//總數(shù)據(jù)源

@end

@implementation MyChannelView

-(instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.selectedArray = [NSMutableArray arrayWithArray:@[@"1", @"2", @"3", @"4", @"5", @"6", @"7", @"8", @"9", @"10"]];
        self.deselectedArray = [NSMutableArray arrayWithArray:@[@"一", @"二", @"三", @"四", @"五", @"六", @"七", @"八", @"九", @"十"]];
        self.allArray = @[self.selectedArray, self.deselectedArray];
        
        UICollectionViewFlowLayout * layout = [[UICollectionViewFlowLayout alloc] init];
        layout.minimumLineSpacing = 5;
        layout.minimumInteritemSpacing = 5;
        layout.scrollDirection = UICollectionViewScrollDirectionVertical;

        self.myChannelCollectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 44, frame.size.width, frame.size.height-44) collectionViewLayout:layout];
        self.myChannelCollectionView.delegate = self;
        self.myChannelCollectionView.dataSource = self;
        self.myChannelCollectionView.backgroundColor = [UIColor whiteColor];
        [self addSubview:self.myChannelCollectionView];
        
        [self.myChannelCollectionView registerClass:[MyChannelCollectionViewCell class] forCellWithReuseIdentifier:MyChannelCollectionViewCellID];
    }
    return self;
}
// delegate/dateSource method
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    return self.allArray.count;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    switch (section) {
        case 0:
            return self.selectedArray.count;
            break;
            
        default:
            return self.deselectedArray.count;
            break;
    }
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    MyChannelCollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:MyChannelCollectionViewCellID forIndexPath:indexPath];
    [cell.titleButton setTitle:self.allArray[indexPath.section][indexPath.row] forState:(UIControlStateNormal)];// 我這里自定義cell中就一個button
    return cell;
}
// 分組間上左下右間距
- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
    return UIEdgeInsetsMake(10, 10, 10, 10);
}
// cell size
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
    return CGSizeMake(ceilf((kGScreenWidth-50)/4), 44);
}
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
   // 這里是重點!
    if (indexPath.section == 0) {
        NSString * one = self.selectedArray[indexPath.row];
        [self.selectedArray removeObject:one];
        [self.deselectedArray insertObject:one atIndex:0];
        self.allArray = @[self.selectedArray, self.deselectedArray];
// 在這里是當你點選某個cell后希望他去哪一區(qū)亿驾，則將其移除于本數(shù)據(jù)源同時加入到你希望他去的那個數(shù)據(jù)源即可嘹黔。然后調(diào)用下面的方法
        [collectionView moveItemAtIndexPath:indexPath toIndexPath:[NSIndexPath indexPathForItem:0 inSection:1]];
// 在調(diào)用該方法前一定要先更改數(shù)據(jù)源！
    }else{
        NSString * one = self.deselectedArray[indexPath.row];
        [self.deselectedArray removeObject:one];
        [self.selectedArray addObject:one];
        self.allArray = @[self.selectedArray, self.deselectedArray];
        [collectionView moveItemAtIndexPath:indexPath toIndexPath:[NSIndexPath indexPathForItem:self.selectedArray.count-1 inSection:0]];
    }
}

@end

讓我們看一下效果：

效果圖

以下是進階版：

#import "MyChannelView.h" // 本類
#import "MyChannelCollectionViewCell.h" // 自定義cell
#import "ChannelModel.h"  //數(shù)據(jù)model類 里面只有兩個屬性：NSString *ID 莫瞬、 NSString *name;
#import "MyChannelHeaderView.h" // 自定義section頭視圖 該視圖包括三個控件儡蔓，UILabel *titleLabel（標題）、UILabel *detaileLabel（說明）疼邀、UIButton *editButton（編輯按鈕）;
// 重用標識
#define  MyChannelCollectionViewCellID  @"MyChannelCollectionViewCellID"
#define HeaderViewID @"SectionHeaderID"

@interface MyChannelView ()<UICollectionViewDelegate,UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>
{
    BOOL isEdit; //記錄我的頻道是否處于編輯狀態(tài)
    BOOL isChanged; //記錄cell 是否移動
}
@property (nonatomic,strong) UIButton *missButton; // 該button上放了一張“X”號圖片 為取消按鈕
@property (nonatomic,strong) UICollectionView *myChannelCollectionView;
@property (nonatomic,strong) NSArray *allArray;
@property (nonatomic,strong) NSMutableArray *selectedArray;
@property (nonatomic,strong) NSMutableArray *deselectedArray;
@property (nonatomic,strong) UIPanGestureRecognizer * panGestureRecognizer; // cell上的拖拽手勢
@property (nonatomic,strong) NSMutableArray *cellAttributesArray;//記錄所有cell的attributes
@property (nonatomic,strong) UICollectionViewLayoutAttributes *attributes_isChange; // 記錄cell拖拽手勢結(jié)束后應(yīng)該在的位置attributes（僅在section為0時cell間拖拽移動使用）
@end

@implementation MyChannelView
-(instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.backgroundColor = [UIColor whiteColor];
        self.cellAttributesArray = [NSMutableArray array];
        self.missButton = [UIButton new];
        [self.missButton setImage:[UIImage imageNamed:@"missImage"] forState:(UIControlStateNormal)];
        [self.missButton addTarget:self action:@selector(missButtonAction) forControlEvents:(UIControlEventTouchUpInside)];
        [self addSubview:self.missButton];
        isEdit = NO; //初始是不處于編輯狀態(tài)
        UICollectionViewFlowLayout * layout = [[UICollectionViewFlowLayout alloc] init];
        layout.minimumLineSpacing = 5;
        layout.minimumInteritemSpacing = 5;
        layout.scrollDirection = UICollectionViewScrollDirectionVertical;
        self.myChannelCollectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 64, frame.size.width, frame.size.height-64) collectionViewLayout:layout];
        self.myChannelCollectionView.delegate = self;
        self.myChannelCollectionView.dataSource = self;
        self.myChannelCollectionView.backgroundColor = [UIColor whiteColor];
        [self addSubview:self.myChannelCollectionView];
        
        [self.myChannelCollectionView registerClass:[MyChannelCollectionViewCell class] forCellWithReuseIdentifier:MyChannelCollectionViewCellID];
        [self.myChannelCollectionView registerClass:[MyChannelHeaderView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:HeaderViewID];
        
        [self requestForData]; // 加載數(shù)據(jù)
    }
    return self;
}
- (void)layoutSubviews
{
    [self.missButton makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(@20);
        make.right.equalTo(@-10);
        make.width.equalTo(@44);
        make.height.equalTo(@44);
    }];
    self.myChannelCollectionView.frame = CGRectMake(0, 64, self.frame.size.width, self.frame.size.height-64);// 這里是做了轉(zhuǎn)屏功能所以····
}
- (void)missButtonAction
{
    [self removeFromSuperview];
}
// 我的頻道界面數(shù)據(jù)
- (void)requestForData
{// 這里是做的數(shù)據(jù)請求喂江，就省略了，見諒旁振。結(jié)果類似如下：
      self.selectedArray = [NSMutableArray arrayWithArray:@[@"1", @"2", @"3", @"4", @"5", @"6", @"7", @"8", @"9", @"10"]];
      self.deselectedArray = [NSMutableArray arrayWithArray:@[@"一", @"二", @"三", @"四", @"五", @"六", @"七", @"八", @"九", @"十"]];
      self.allArray = @[self.selectedArray, self.deselectedArray];
      [self.myChannelCollectionView reloadData];
// 不過演示中數(shù)組元素都是model
}
// delegate/dateSource method
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    return self.allArray.count;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    switch (section) {
        case 0:
            return self.selectedArray.count;
            break;
        default:
            return self.deselectedArray.count;
            break;
    }
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    MyChannelCollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:MyChannelCollectionViewCellID forIndexPath:indexPath];
    self.panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGestureRecognizerAction:)];
    ChannelModel * model = self.allArray[indexPath.section][indexPath.row];
    [cell.titleButton setTitle:model.name forState:(UIControlStateNormal)];
    if (isEdit && indexPath.section == 0) {
        cell.editedButton.hidden = NO;
        [cell addGestureRecognizer:self.panGestureRecognizer];
    }else{// 隱藏表示處于編輯狀態(tài)的按鈕并移除拖拽手勢
        cell.editedButton.hidden = YES;
        NSArray * gestureArray = [cell gestureRecognizers];
        for (UIGestureRecognizer * gesture in gestureArray) {
            if ([gesture isKindOfClass:[UIPanGestureRecognizer class]]) {
                [cell removeGestureRecognizer:gesture];
            }
        }
    }
    return cell;
}
- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath
{
    UICollectionReusableView * headerView = nil;
    if (kind == UICollectionElementKindSectionHeader) {
        MyChannelHeaderView * channelHeaderView = (MyChannelHeaderView *)[collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:HeaderViewID forIndexPath:indexPath];
        if (indexPath.section == 0) {
            channelHeaderView.titleLabel.text = @"我的頻道";
            if (isEdit) {
                channelHeaderView.detaileLabel.hidden = NO;
            }else{
                channelHeaderView.detaileLabel.hidden = YES;
            }
            channelHeaderView.editButton.hidden = NO;
            [channelHeaderView.editButton addTarget:self action:@selector(channelHeaderViewAction) forControlEvents:(UIControlEventTouchUpInside)]; 
            MyindexPath = indexPath;
        }else{
            channelHeaderView.titleLabel.text = @"點擊添加頻道";
            channelHeaderView.editButton.hidden = YES;
            channelHeaderView.detaileLabel.hidden = YES;
        }
        headerView = (UICollectionReusableView *)channelHeaderView;
    }
    return headerView;
}
#pragma  編輯按鈕點擊事件
- (void)channelHeaderViewAction
{
    isEdit = !isEdit;
    [self.myChannelCollectionView reloadData];
}
// 分組間上左下右間距
- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
    return UIEdgeInsetsMake(10, 10, 10, 10);
}
// header size
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section
{
    return CGSizeMake(kGScreenWidth, 44);
}
// cell size
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
    return CGSizeMake(ceilf((kGScreenWidth-50)/4), 44);
}
//cell的點擊事件
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
    
    MyChannelCollectionViewCell * cell = (MyChannelCollectionViewCell *)[collectionView cellForItemAtIndexPath:indexPath];
    if (indexPath.section == 0) {
#pragma 當處于編輯狀態(tài)時點擊會使零區(qū)cell移動到一區(qū)获询，不處于編輯狀態(tài)則會觸發(fā)其他事件
        if (isEdit) {
            ChannelModel * one = self.selectedArray[indexPath.row];
            [self.selectedArray removeObject:one];
            [self.deselectedArray insertObject:one atIndex:0];
            self.allArray = @[self.selectedArray, self.deselectedArray];
            [self setAllArrayToDefault:self.allArray];
            NSArray * gestureArray = [cell gestureRecognizers];
            for (UIGestureRecognizer * gesture in gestureArray) {
                if ([gesture isKindOfClass:[UIPanGestureRecognizer class]]) {
                    [cell removeGestureRecognizer:gesture];
                }
            }
            [collectionView moveItemAtIndexPath:indexPath toIndexPath:[NSIndexPath indexPathForItem:0 inSection:1]];
            cell.editedButton.hidden = YES;
        }else{ // 觸發(fā)其他事件，e.g  :跳轉(zhuǎn)到其他頁面等
        }
    }else{
#pragma 一區(qū)的cell只能點擊 不能拖拽拐袜，點擊后只會移動到零區(qū)同時添加拖拽手勢
        ChannelModel * one = self.deselectedArray[indexPath.row];
        [self.deselectedArray removeObject:one];
        [self.selectedArray addObject:one];
        self.allArray = @[self.selectedArray, self.deselectedArray];
        [self setAllArrayToDefault:self.allArray];
        [cell addGestureRecognizer:self.panGestureRecognizer];
        [collectionView moveItemAtIndexPath:indexPath toIndexPath:[NSIndexPath indexPathForItem:self.selectedArray.count-1 inSection:0]];
        if (isEdit) {
            cell.editedButton.hidden = NO;
        }else{
            cell.editedButton.hidden = YES;
        }
    }
}
#pragma  拖拽手勢響應(yīng)事件
- (void)panGestureRecognizerAction:(UIPanGestureRecognizer *)sender
{
    MyChannelCollectionViewCell *cell = (MyChannelCollectionViewCell *)sender.view;
    NSIndexPath *cellIndexPath = [self.myChannelCollectionView indexPathForCell:cell];
    //將拖拽的cell提于視圖最前面
    [self.myChannelCollectionView bringSubviewToFront:cell];
    //  手勢響應(yīng)的三個狀態(tài)
    if (sender.state == UIGestureRecognizerStateBegan) {
        [self.cellAttributesArray removeAllObjects];
        for (int i = 0;i< self.allArray.count; i++) {
            NSMutableArray * tempArray = [NSMutableArray array];
            NSArray * countArray = self.allArray[i];
            for (int j = 0; j < countArray.count; j++) {
  #pragma 這里是獲取每一個cell的屬性集合（Attributes）吉嚣，并按區(qū)區(qū)分開。很重要蹬铺！
                [tempArray addObject:[self.myChannelCollectionView layoutAttributesForItemAtIndexPath:[NSIndexPath indexPathForItem:j inSection:i]]];
            }
            [self.cellAttributesArray addObject:tempArray];
        }
    }else if (sender.state == UIGestureRecognizerStateChanged){
        cell.center = [sender locationInView:self.myChannelCollectionView]; // 讓cell時刻跟隨手勢移動
        NSArray *tempArr = self.cellAttributesArray[0];
        for (UICollectionViewLayoutAttributes *attributes in tempArr) {
#pragma 判斷Attributes集合中的元素的fram是否包含cell的center尝哆，同時不能使cell本身且分區(qū)必須為0 才能成功地移動換位置
            if (CGRectContainsPoint(attributes.frame, cell.center) && cellIndexPath != attributes.indexPath && attributes.indexPath.section == 0) {
                isChanged = YES; // 標識-cell已經(jīng)和其他cell換了位置
                //對數(shù)組中存放的元素重新排序
                ChannelModel * one = self.selectedArray[cellIndexPath.row];
                [self.selectedArray removeObject:one];
                [self.selectedArray insertObject:one atIndex:attributes.indexPath.row];
                self.allArray = @[self.selectedArray, self.deselectedArray];
                [self setAllArrayToDefault:self.allArray];
                [self.myChannelCollectionView moveItemAtIndexPath:cellIndexPath toIndexPath:attributes.indexPath];
                self.attributes_isChange = attributes; // 移動完成后記錄被替換的cell的屬性（用來矯正cell位置）
            }
        }
    }else if (sender.state == UIGestureRecognizerStateEnded) {
        if (!isChanged) { // 沒有換位置（這里有兩種情況1、拖拽到了一區(qū)甜攀；2秋泄、還在自己原來的位置上）
            UICollectionViewLayoutAttributes *attributes_done;
            for (NSArray *tempArr in self.cellAttributesArray) {
                for (UICollectionViewLayoutAttributes *attributes in tempArr) {
                    if (CGRectContainsPoint(attributes.frame, [sender locationInView:self.myChannelCollectionView])) {
                        attributes_done = attributes;
                    }
                }
            }
            if (attributes_done.indexPath.section == 1) {
                ChannelModel * one = self.selectedArray[cellIndexPath.row];
                [self.selectedArray removeObject:one];
                [self.deselectedArray insertObject:one atIndex:0];
                self.allArray = @[self.selectedArray, self.deselectedArray];
                [self setAllArrayToDefault:self.allArray];
                NSArray * gestureArray = [cell gestureRecognizers];
                for (UIGestureRecognizer * gesture in gestureArray) {
                    if ([gesture isKindOfClass:[UIPanGestureRecognizer class]]) {
                        [cell removeGestureRecognizer:gesture];
                    }
                }
                cell.editedButton.hidden = YES;
                [self.myChannelCollectionView moveItemAtIndexPath:cellIndexPath toIndexPath:[NSIndexPath indexPathForItem:0 inSection:1]];
            }else{ // 位置未改變情況下位置矯正
                cell.center = [self.myChannelCollectionView layoutAttributesForItemAtIndexPath:cellIndexPath].center;
            }
        }else{// 已經(jīng)移動后矯正位置
            cell.center = self.attributes_isChange.center;
        }
        isChanged = NO;
    }
}
@end

效果圖：（做的有點難看琐馆，大家將就~~）

進階版效果圖

最后編輯于：2017.12.06 08:17:35

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