iOS - 自定义 AccessoryView 未显示在 UITableViewCell 中

Question

我试图在表格 View 单元格中显示带有接受按钮和拒绝按钮(作为 subview )的自定义 View 。我实现了以下代码:

tableView: cellForRowAtIndexPath: method

...
if ([status isEqualToString:@"pending"] || [status isEqualToString:@"declined"]){
    cell.accessoryView = [self setAccessoryViewForCell:cell];
} else {
    cell.accessoryType = UITableViewCellAccessoryNone;
}
...

- (UIView *)setAccessoryViewForCell:(UITableViewCell *)cell
{
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(192, 0, 128, 44)];
    UIButton *acceptButton = [[UIButton alloc] initWithFrame:CGRectMake(2, 5, 60, 34)];
    UIButton *declineButton = [[UIButton alloc] initWithFrame:CGRectMake(66, 5, 60, 34)];
    [acceptButton setTitle:@"A" forState:UIControlStateNormal];
    [declineButton setTitle:@"D" forState:UIControlStateNormal];
    [acceptButton addTarget:self action:@selector(acceptButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
    [declineButton addTarget:self action:@selector(declineButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
    [view addSubview:acceptButton];
    [view addSubview:declineButton];
    return view;
}

我已尝试调试它，但方法调用正确。

Answer 1

最后，问题不在cellForRowAtIndexPath:方法，而在setAccessoryViewForCell:方法。在创建包含两个按钮作为 subview 的 View 时，我真的不应该为框架使用文字值。我没有为 accessoryView 属性设置 View ，而是重写了整个 cellForRowAtIndexPath: 方法并向单元格的 contentView 添加了一个 subview 。

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {
    static NSString *identifier = @"notificationsCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
    if (!cell){
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:identifier];
    }
    PFObject *user = [self.objects objectAtIndex:indexPath.row];
    NSString *firstName = [user objectForKey:@"firstName"];
    NSString *lastName = [user objectForKey:@"lastName"];
    cell.textLabel.text = [NSString stringWithFormat:@"%@ %@", firstName, lastName];

    UIView *view = [UIView new];
    view.frame = CGRectMake(230, 2, 80, 40);
    view.backgroundColor = [UIColor whiteColor];

    UIButton *acceptButton = [UIButton buttonwithType:UIButtonTypeCustom];
    UIButton *declineButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [acceptButton setTitle:@"" forState:UIControlStateNormal];
    [declineButton setTitle:@"" forState:UIControlStateNormal];
    [acceptButton setImage:[UIImage imageNamed:@"Ok.png"] forState:UIControlStateNormal];
    [declineButton setImage:[UIImage imageNamed:@"Close.png"] forState:UIControlStateNormal];
    [acceptButton addTarget:self action:@selector(acceptButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
    [declineButton addTarget:self action:@selector(declineButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
    acceptButton.frame = CGRectMake(CGRectGetMinX(view.bounds), CGRectGetMinY(view.bounds), CGRectGetWidth(view.bounds)/2, CGRectGetHeight(view.bounds));
    declineButton.frame = CGRectMake(CGRectGetMidX(view.bounds), CGRectGetMinY(view.bounds), CGRectGetWidth(view.bounds)/2, CGRectGetHeight(view.bounds));

    [view addSubview:acceptButton];
    [view addSubview:declineButton];
    [cell.contentView addSubview:view];

    return cell;
 }

主要区别在于，在为每个按钮设置框架时，我使用了文字值(不是一个好的做法)，现在我使用了 CGRect 函数 CGRectGetMinX(CGRect rect)、CGRectGetMinY(CGRect rect)、CGRectGetWidth(CGRect rect) , CGRectGetMidX(CGRect rect) 和 CGRectGetHeight(CGRect rect) 以获得更准确的值来设置每个按钮的框架。这是对 UIView 框架工作方式的误解，我建议始终使用这些函数来获取 subview 的来源和大小，而不是使用文字值。