ios - UITableview 单元格未在 reloaddata 上更新

Question

我正在使用下面的代码来填充 tableview 行。单击一行时，我正在重新加载表数据，但未更新行。在 iOS 11 之前它工作正常，但在更新到 iOS 11 后，我遇到了这个问题:

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

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"DayCell" forIndexPath:indexPath];

UILabel *label = [cell viewWithTag:101];
UIImageView *imageView = [cell viewWithTag:102];

NSArray *days = @[@"Sunday", @"Monday", @"Tuesday", @"Wednesday", @"Thursday", @"Friday", @"Saturday"];
label.text = [days objectAtIndex:indexPath.row];

if ([_selectedDays containsObject:label.text]) {
    imageView.image = [UIImage imageNamed:@"CheckedIcon"];
} else {
    imageView.image = nil;
}

return cell;
}

我正在像这样在 didSelectRowAtIndexPath 中重新加载数据:

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[tableView deselectRowAtIndexPath:indexPath animated:NO];

UITableViewCell *cell = [self tableView:tableView cellForRowAtIndexPath:indexPath];
UILabel *label = [cell viewWithTag:101];

if ([_selectedDays containsObject:label.text]) {
    [_selectedDays removeObject:label.text];
} else {
    [_selectedDays addObject:label.text];
}

[tableView reloadData];
}

难道我做错了什么？

Answer 1

我在苹果开发者论坛上得到了答案。我必须在界面中声明天数数组并在 viewDidLoad 中初始化它并更改 didSelectRowAtIndexPath 中的代码.所以现在我的代码如下所示:

@interface SomeTableViewController {  

@property (nonatomic, strong) NSArray *days;  
@property (nonatomic, strong) NSMutableArray *selectedDays;  

}  
...  
- (void)viewDidLoad {  
  [super viewDidLoad];  

  _days = @[@"Sunday", @"Monday", @"Tuesday", @"Wednesday", @"Thursday", @"Friday", @"Saturday"];  
  _selectedDays = @[];  

   [tableView reloadData];  
  ...  
}  

...  

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

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"DayCell" forIndexPath:indexPath];  

    UILabel *label = [cell viewWithTag:101];  
    UIImageView *imageView = [cell viewWithTag:102];  

    NSString *text = _days[indexPath.row];  

    label.text = text;  

    if ([_selectedDays containsObject:text]) {  
        imageView.image = [UIImage imageNamed:@"CheckedIcon"];  
    } else {  
        imageView.image = nil;  
    }  

    return cell;  
}  

...  

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {  
    [tableView deselectRowAtIndexPath:indexPath animated:NO];  

     NSString *text = _days[indexPath.row];  

    if ([_selectedDays containsObject:text]) {  
        [_selectedDays removeObject:text];  
    } else {  
        [_selectedDays addObject:text];  
    }  

    [tableView reloadData];  
}  

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {  
  return _days.count;  
}  

引用: https://forums.developer.apple.com/message/263637#263637