如何更改uinavigationbar后退按钮文本

Question

我目前正在尝试更改加载了tablecell touch的子视图的后退按钮文本.然而,即使按照我尝试实现它的方式,它仍然在后退按钮中显示父母标题.

我试图在viewdidload方法中的后退按钮中加载一个新值,就像这样

UIBarButtonItem *myBarButtonItem = [[UIBarButtonItem alloc] init];
myBarButtonItem.title = @"Back";
self.navigationItem.backBarButtonItem = myBarButtonItem;
[myBarButtonItem release];

但它不起作用.

Answer 1

你需要改变self.navigationItem.backBarButtonItem以前的观点,而不是当前的观点(我知道,这看起来有点不合逻辑).例如,在表视图中,您可以执行以下操作:

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self setTitle:@"My title"];
    UIBarButtonItem *boton = [[UIBarButtonItem alloc] initWithTitle:@"Custom back button text" style:UIBarButtonItemStyleBordered target:self action:@selector(mySelector:)];
    self.navigationItem.backBarButtonItem  = boton;
    [boton release];
}

Answer 2

在您阅读并重新阅读并使用每个设置之前,这是文档不太清楚的地方.
要更改默认后退按钮的标题,请添加此行viewDidLoad()

self.navigationController.navigationBar.topItem.title = @"Your Label";

如果希望按钮不可见 - 则将值设置为@""空字符串.

Answer 3

好吧想通了,我在父视图tableView:didSelectRowAtIndexPath:方法中发布了这段代码.这就是我的用户可以选择多个tablecells的方式.希望这可以帮助.

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Navigation logic may go here. Create and push another view controller.
    if (indexPath.section == 0) { //--- picks (first) section

     ChildViewController *childViewController = [[ChildViewController alloc] initWithNibName:@"ChildViewController" bundle:nil];
     // ...
     // Pass the selected object to the new view controller.
     [self.navigationController pushViewController:childViewController animated:YES];
    //--- this sets the back button to "Back" every time you load the child view.
     self.navigationItem.backBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:@"Back" style: UIBarButtonItemStyleBordered target:nil action:nil] autorelease];

        if(indexPath.row == 0) { //--- picks row
            childViewController.title = @"Bike";
        }
        if(indexPath.row == 1) {
            childViewController.title = @"Model";
        }
        [vehicleSearchResponseTableViewController release];
    }


}

Answer 4

到目前为止，您的代码看起来不错。

这段代码是在之前执行的吗

[super viewDidLoad];

声明（错误）还是声明之后（好）？