如何代码实现 tableview 全部勾选检查框

以下是一个简单的示例代码，演示如何实现 tableview 中的全部勾选检查框。

在ViewController.h文件中，添加以下属性和方法：

@property (nonatomic, strong) UITableView *tableView;
@property (nonatomic, strong) NSMutableArray *selectedArray;
@property (nonatomic, assign) BOOL isAllSelected;

- (void)selectAllRows:(id)sender;

在ViewController.m文件中，实现以下代码：

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 初始化tableview
    self.tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
    self.tableView.delegate = self;
    self.tableView.dataSource = self;
    [self.view addSubview:self.tableView];
    
    // 初始化selectedArray
    self.selectedArray = [NSMutableArray array];
    for (NSInteger i = 0; i < 10; i++) {
        [self.selectedArray addObject:@(NO)];
    }
    
    // 添加“全选”按钮
    UIBarButtonItem *selectAllButton = [[UIBarButtonItem alloc] initWithTitle:@"全选" style:UIBarButtonItemStylePlain target:self action:@selector(selectAllRows:)];
    self.navigationItem.rightBarButtonItem = selectAllButton;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return 10;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *cellIdentifier = @"cellIdentifier";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
    }
    
    // 添加勾选框
    if (![cell.contentView viewWithTag:100]) {
        UIButton *selectButton = [UIButton buttonWithType:UIButtonTypeCustom];
        selectButton.tag = 100;
        selectButton.frame = CGRectMake(10, 10, 30, 30);
        [selectButton setImage:[UIImage imageNamed:@"unselected"] forState:UIControlStateNormal];
        [selectButton setImage:[UIImage imageNamed:@"selected"] forState:UIControlStateSelected];
        [selectButton addTarget:self action:@selector(selectRow:) forControlEvents:UIControlEventTouchUpInside];
        [cell.contentView addSubview:selectButton];
    }
    
    // 设置勾选框状态
    UIButton *selectButton = [cell.contentView viewWithTag:100];
    selectButton.selected = [self.selectedArray[indexPath.row] boolValue];
    
    // 设置cell内容
    cell.textLabel.text = [NSString stringWithFormat:@"第%ld行", indexPath.row+1];
    
    return cell;
}

- (void)selectRow:(UIButton *)sender {
    // 获取点击的cell的indexPath
    UITableViewCell *cell = (UITableViewCell *)sender.superview.superview;
    NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
    
    // 修改勾选状态
    BOOL isSelected = [self.selectedArray[indexPath.row] boolValue];
    isSelected = !isSelected;
    [self.selectedArray replaceObjectAtIndex:indexPath.row withObject:@(isSelected)];
    
    // 更新勾选框状态
    sender.selected = isSelected;
    
    // 判断是否全部勾选，更新“全选”按钮状态
    NSInteger selectedCount = 0;
    for (NSNumber *isSelected in self.selectedArray) {
        if ([isSelected boolValue]) {
            selectedCount++;
        }
    }
    self.isAllSelected = (selectedCount == self.selectedArray.count);
    self.navigationItem.rightBarButtonItem.title = self.isAllSelected ? @"取消全选" : @"全选";
}

- (void)selectAllRows:(id)sender {
    // 修改勾选状态
    self.isAllSelected = !self.isAllSelected;
    for (NSInteger i = 0; i < self.selectedArray.count; i++) {
        [self.selectedArray replaceObjectAtIndex:i withObject:@(self.isAllSelected)];
    }
    
    // 更新勾选框状态
    [self.tableView reloadData];
    
    // 更新“全选”按钮状态
    self.navigationItem.rightBarButtonItem.title = self.isAllSelected ? @"取消全选" : @"全选";
}

- (void)finishButtonClicked:(id)sender {
    // 遍历勾选状态进行操作
    for (NSInteger i = 0; i < self.selectedArray.count; i++) {
        if ([self.selectedArray[i] boolValue]) {
            // 执行相应的操作
        }
    }
}

以上代码实现了在 tableview 中添加全部勾选检查框的功能，通过点击勾选框来修改勾选状态，通过 “全选” 按钮来修改所有行的勾选状态。在点击完成按钮时，遍历所有行的勾选状态进行相应操作。