iOS - 在UITableViewCell中未显示自定义AccessoryView

Question

我试图在表格视图单元格中显示带有接受按钮并拒绝按钮（作为子视图）的自定义视图。我执行以下代码：

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; 
} 

我试图调试它，但方法调用得当。

Answer 1

最后，问题不在cellForRowAtIndexPath：方法中，而是在setAccessoryViewForCell：方法中。当创建一个包含两个按钮作为子视图的视图时，我真的不应该使用帧的文字值。我重写了整个cellForRowAtIndexPath：方法，并为单元格的contentView添加了一个子视图，而不是为accessoryView属性设置视图。

- (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; 
} 

的主要区别是，对每个按钮设定的帧的情况下，我使用文字值（不是一个好的做法），现在我用的CGRect功能CGRectGetMinX（的CGRect RECT），CGRectGetMinY（的CGRect RECT），CGRectGetWidth （CGRect矩形），CGRectGetMidX（CGRect矩形）和CGRectGetHeight（CGRect矩形）来获得更精确的值来设置每个按钮的框架。这是对UIView框架如何工作的一种误解，我推荐始终使用这些函数来获取子视图的原点和大小，而不是使用文字值。

Answer 2

问题似乎是你没有从setAccessoryViewForCell方法返回UIView。

return view; 

请从上述方法返回视图，它可能会解决您的问题。