关于导航控制器

Question

在我的应用程序中，我在viewWillAppear方法中编程创建了一个leftbarbuttonitem，我有两次点击两次来工作，我的代码如下。

Code for creating UIBarButtonItem(left bar button) 

    goingBackButton = [[UIBarButtonItem alloc] init]; 
goingBackButton.title = @"Back"; 
goingBackButton.target = self; 
goingBackButton.action = @selector(backAction); 
self.navigationItem.leftBarButtonItem = goingBackButton; 
[goingBackButton release]; 


    Action code 

    - (IBAction) backAction { 

NSLog(@"Inside the backAction of uploadViewController"); 
[self.navigationController popViewControllerAnimated:YES]; 
    NSLog(@"Inside the backAction1 of uploadViewController"); 
    } 

Answer 1

试试下面的代码：

UIBarButtonItem *bar = [[UIBarButtonItem alloc]initWithTitle:@"back" style:UIBarButtonItemStyleDone target:nil action:@selector(back)]; 
self.navigationItem.leftBarButtonItem = bar; 
[bar release]; 

-(void)back 
{ 
[self.navigationController popViewControllerAnimated:YES]; 

}