iphone - uitableview reloadRowsAtIndexPaths 不工作

Question

我有一个 tableviewcell在RegisterViewController ，当我点击它时，它会推送到 SelectCityViewController我可以从 uipickerview 中选择一个城市.我在 SelectCityViewController 中定义了一个委托(delegate).但是当我实现委托(delegate)方法时，我从 pickerview 得到了城市。和选定的 indexpath来自 didSelectRowAtIndexPath在RegisterViewController .当我检查日志时，我得到了城市和选定的 indexpath .但是当我调用reloadRowsAtIndexPaths ，单元格仍然有旧的 titlelabel 文本。代码:

SelectCityViewController.h

@protocol SelectCityDelegate <NSObject>

- (void)didGetCity:(City *)city;

@end

SelectCityViewController.m

- (void)finished:(UIBarButtonItem *)buttonItem
{
    if ([self.delegate respondsToSelector:@selector(didGetCity:)]) {
        [self.delegate didGetCity:self.city];
    }
    NSLog(@"%@", self.city.city);
    [self.navigationController popViewControllerAnimated:YES];
}

RegisterViewController.m

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (indexPath.section == 2) {
        self.selectedIndexPath = indexPath;
        UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"MainStoryboard_iPhone" bundle:nil];
        SelectCityViewController *signUp = [storyBoard instantiateViewControllerWithIdentifier:@"SignVC"];
        signUp.delegate = self;
        [self.navigationController pushViewController:signUp animated:YES];
    }
}

- (void)didGetCity:(City *)city
{
    NSLog(@"%@", city.city);
    NSLog(@"%@", selectedIndexPath);
    UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:selectedIndexPath];
    cell.textLabel.text = city.city;
    [self.tableView reloadRowsAtIndexPaths:@[selectedIndexPath] withRowAnimation:UITableViewRowAnimationFade];
}

Answer 1

我认为问题出在下面的代码中，您不必在此处设置值，因为当您重新加载时，它将使用您创建单元格的函数中的值覆盖该值。

UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:selectedIndexPath];
cell.textLabel.text = city.city;

只需重新加载单元格，并将上面的代码放入您的

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

   //Cell intialization and other things

      cell.textLabel.text = city.city;
}