navigationController问题

Question

我有以下几点：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath(NSIndexPath*)indexPath
{

     audiChassisInputViewController = [[myAudiChassisInputViewController alloc] init];    

    [self.navigationController pushViewController:audiChassisInputViewController animated:YES];

    self.navigationController.navigationBarHidden = NO;

    UIBarButtonItem *retourButton = [[UIBarButtonItem alloc] initWithTitle:@"Retour" style:UIBarButtonItemStyleBordered target:self.navigationController action:@selector(popViewControllerAnimated:)]; 
    [self.navigationController.navigationBar.topItem setLeftBarButtonItem:retourButton];
    [self.navigationController.navigationBar.topItem setTitle:@"Chassis Input"];
    [retourButton release];

    [audiChassisInputViewController release];

}

并展示了这个workes...the新视图。

在新观点中：

myAudiChassisInputViewController.h

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    chassisInputTextView.layer.cornerRadius = 15;
    chassisInputTextView.clipsToBounds = YES;
    [chassisInputTextView becomeFirstResponder];

    UIBarButtonItem *okButton = [[UIBarButtonItem alloc] initWithTitle:@"OK" style:UIBarButtonItemStyleBordered target:self action:@selector(chassisOkPressed)];  
    [self.navigationController.navigationBar.topItem setRightBarButtonItem:okButton];
    [okButton release];

}

我没有错误，但是没有正确的酒吧按钮shown.Anyone，知道为什么吗？

Answer 1

更改这一行：

[self.navigationController.navigationBar.topItem setRightBarButtonItem:okButton];

用这一行：

[[self navigationItem] setRightBarButtonItem:okButton];

问题是，在执行viewDidLoad时，导航栏(self.navigationController.navigationBar.topItem)的顶部项仍然指向后视图控制器的导航项。

后视图控制器是在当前顶视图控制器被推到堆栈([[viewControllers objectAtIndex:[viewControllers count] - 2] navigationItem])之前曾经是顶视图控制器的控制器。下面的片段显示导航栏的顶部项如何仍然指向viewDidLoad中的back视图控制器的导航项，仅用于说明目的：

// the view controllers currently on the navigation stack
NSArray *viewControllers = self.navigationController.viewControllers;
// The root view controller is at index 0 in the array, the back view controller is at index n-2, and the top controller is at index n-1, where n is the number of items in the array.
UIViewController *backViewController = [viewControllers objectAtIndex:[viewControllers count] - 2];
// get the navigation item of the back view controller
UINavigationItem *backNavigationItem = backViewController.navigationItem;
UINavigationItem *topItem = self.navigationController.navigationBar.topItem;
if  (backNavigationItem == topItem) {
    NSLog(@"This gets logged to the console");
}

Answer 2

去你的

myAudiChassisInputViewController.m文件

位置跟随代码

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    UIBarButtonItem *retourButton = [[UIBarButtonItem alloc] initWithTitle:@"Retour" style:UIBarButtonItemStyleBordered target:self.navigationController action:@selector(popViewControllerAnimated:)];

    UIBarButtonItem *itemOkey=[[UIBarButtonItem alloc] initWithTitle:@"OK" style:UIBarButtonItemStyleBordered target:self action:@selector(chassisOkPressed)];

    self.navigationItem.rightBarButtonItem=itemOkey;
    self.navigationItem.leftBarButtonItem=retourButton;
}

我有如下所需的有效输出：

​

希望它对你有帮助。

Answer 3

如果您有类的xib文件，那么添加导航控制器并添加导航条，然后在导航栏下面添加UIBarButton。