UITableVIew与UICollectionView带动画删除cell时崩溃的处理

2022-10-21 15:02:06

-会崩溃的原因是因为没有处理好数据源与cell之间的协调关系-

效果:

tableView的源码:

ModelCell.h + ModelCell.m

//

//  ModelCell.h

//  Set

//

//  Created by YouXianMing on 14/11/24.

//  Copyright (c) 2014年 YouXianMing. All rights reserved.

//

#import <UIKit/UIKit.h>

@class ModelCell;

@protocol ModelCellDelegate <NSObject>

@optional

- (void)modelCellButton:(ModelCell *)cell;

@end

@interface ModelCell : UITableViewCell

@property (nonatomic, weak)   id<ModelCellDelegate>  delegate;

@property (nonatomic, strong) UILabel *title;

@end

//

//  ModelCell.m

//  Set

//

//  Created by YouXianMing on 14/11/24.

//  Copyright (c) 2014年 YouXianMing. All rights reserved.

//

#import "ModelCell.h"

@implementation ModelCell

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {

    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];

    if (self) {

        UIButton *button = [[UIButton alloc] initWithFrame:self.bounds];

        [button addTarget:self

                   action:@selector(buttonsEvent:)

         forControlEvents:UIControlEventTouchUpInside];

        [self addSubview:button];

        _title               = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];

        _title.textAlignment = NSTextAlignmentLeft;

        _title.font          = [UIFont fontWithName:@"HelveticaNeue-Thin" size:.f];

        [self addSubview:_title];

    }

    return self;

}

- (void)buttonsEvent:(UIButton *)button {

    if (_delegate && [_delegate respondsToSelector:@selector(modelCellButton:)]) {

        [_delegate modelCellButton:self];

    }

}

@end

控制器源码:

//

//  ViewController.m

//  Set

//

//  Created by YouXianMing on 14/11/24.

//  Copyright (c) 2014年 YouXianMing. All rights reserved.

//

#import "ViewController.h"

#import "ModelCell.h"

@interface ViewController ()<UITableViewDelegate, UITableViewDataSource, ModelCellDelegate>

@property (nonatomic, strong) UITableView    *tableView;

@property (nonatomic, strong) NSMutableArray *dataArray;

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // 初始化数据源

    _dataArray = [NSMutableArray array];

    [_dataArray addObject:@"YouXianMing"];

    [_dataArray addObject:@"Job"];

    [_dataArray addObject:@"NoZuoNoDie"];

    [_dataArray addObject:@"XiaoMing"];

    [_dataArray addObject:@"Smith"];

    [_dataArray addObject:@"K.K.K."];

    // 初始化tableView

    _tableView = [[UITableView alloc] initWithFrame:self.view.bounds

                                              style:UITableViewStylePlain];

    _tableView.delegate       = self;

    _tableView.dataSource     = self;

    _tableView.separatorStyle = UITableViewCellSeparatorStyleNone;

    [self.view addSubview:_tableView];

    [_tableView registerClass:[ModelCell class] forCellReuseIdentifier:@"YouXianMing"];

}

#pragma mark - 代理

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    return [_dataArray count];

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    ModelCell *cell = [tableView dequeueReusableCellWithIdentifier:@"YouXianMing"];

    cell.delegate   = self;

    cell.title.text = _dataArray[indexPath.row];

    return cell;

}

- (void)modelCellButton:(ModelCell *)cell {

    // 获取到cell的indexPath

    NSIndexPath *indexPath = [_tableView indexPathForCell:cell];

    // 删除数据源

    [_dataArray removeObjectAtIndex:indexPath.row];

    // 执行删除动画效果

    [_tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationLeft];

}

@end

UICollectionView源码:

ModelCell.h + ModelCell.m

//

//  ModelCell.h

//  collection

//

//  Created by YouXianMing on 14/11/25.

//  Copyright (c) 2014年 YouXianMing. All rights reserved.

//

#import <UIKit/UIKit.h>

@class ModelCell;

@protocol ModelCellDelegate <NSObject>

@optional

- (void)modelCellEvent:(ModelCell *)cell;

@end

@interface ModelCell : UICollectionViewCell

@property (nonatomic, weak)   id<ModelCellDelegate>  delegate;

@property (nonatomic, strong) UILabel               *title;

@end

//

//  ModelCell.m

//  collection

//

//  Created by YouXianMing on 14/11/25.

//  Copyright (c) 2014年 YouXianMing. All rights reserved.

//

#import "ModelCell.h"

@implementation ModelCell

- (instancetype)initWithFrame:(CGRect)frame {

    self = [super initWithFrame:frame];

    if (self) {

        _title               = [[UILabel alloc] initWithFrame:self.bounds];

        _title.textAlignment = NSTextAlignmentCenter;

        [self addSubview:_title];

        self.layer.borderWidth = .f;

        UIButton *button = [[UIButton alloc] initWithFrame:self.bounds];

        [button addTarget:self

                   action:@selector(buttonEvent:)

         forControlEvents:UIControlEventTouchUpInside];

        [self addSubview:button];

    }

    return self;

}

- (void)buttonEvent:(UIButton *)button {

    if (_delegate && [_delegate respondsToSelector:@selector(modelCellEvent:)]) {

        [_delegate modelCellEvent:self];

    }

}

@end

CellLayout.h + CellLayout.m

//

//  CellLayout.h

//  collection

//

//  Created by YouXianMing on 14/11/25.

//  Copyright (c) 2014年 YouXianMing. All rights reserved.

//

#import <UIKit/UIKit.h>

@interface CellLayout : UICollectionViewFlowLayout

@end

//

//  CellLayout.m

//  collection

//

//  Created by YouXianMing on 14/11/25.

//  Copyright (c) 2014年 YouXianMing. All rights reserved.

//

#import "CellLayout.h"

@implementation CellLayout

- (instancetype)init {

    self = [super init];

    if (self) {

        self.itemSize                = CGSizeMake([UIScreen mainScreen].bounds.size.width / .f, ); // 单元格尺寸

        self.sectionInset            = UIEdgeInsetsMake(, , , );                                   // 单元格边缘

        self.minimumInteritemSpacing = ;                                                              // 横排单元格最小间隔

        self.minimumLineSpacing      = ;                                                              // 单元格最小行间距

    }

    return self;

}

@end

控制器源码:

//

//  ViewController.m

//  collection

//

//  Created by YouXianMing on 14/11/25.

//  Copyright (c) 2014年 YouXianMing. All rights reserved.

//

#import "ViewController.h"

#import "CellLayout.h"

#import "ModelCell.h"

@interface ViewController ()<UICollectionViewDataSource, UICollectionViewDelegate, ModelCellDelegate>

@property (nonatomic, strong) UICollectionView *collectionView;

@property (nonatomic, strong) NSMutableArray   *dataArray;

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // 初始化数据源

    _dataArray = [NSMutableArray array];

    [_dataArray addObject:@"YouXianMing"];

    [_dataArray addObject:@"Job"];

    [_dataArray addObject:@"NoZuoNoDie"];

    [_dataArray addObject:@"XiaoMing"];

    [_dataArray addObject:@"Smith"];

    [_dataArray addObject:@"K.K.K."];

    // 创建出UICollectionView

    _collectionView = [[UICollectionView alloc] initWithFrame:self.view.bounds

                                         collectionViewLayout:[CellLayout new]];

    _collectionView.backgroundColor = [UIColor whiteColor];

    _collectionView.delegate        = self;

    _collectionView.dataSource      = self;

    [_collectionView registerClass:[ModelCell class] forCellWithReuseIdentifier:@"YouXianMing"];

    [self.view addSubview:_collectionView];

}

#pragma mark - 代理

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {

    return [_dataArray count];

}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {

    ModelCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"YouXianMing"

                                                                forIndexPath:indexPath];

    cell.title.text = _dataArray[indexPath.row];

    cell.delegate   = self;

    return cell;

}

- (void)modelCellEvent:(ModelCell *)cell {

    // 获取到cell的indexPath

    NSIndexPath *indexPath = [_collectionView indexPathForCell:cell];

    // 删除数据源

    [_dataArray removeObjectAtIndex:indexPath.row];

    // 执行删除动画效果

    [_collectionView deleteItemsAtIndexPaths:@[indexPath]];

}

@end

分析:

注意:

1. 先取得cell的indexPath

2. 删除数据源

3. 执行删除cell的操作,带动画

执行delete操作的时候,并不会刷新数据源,不会执行reloadData,注意.

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