关于navigationcontroller

Question

在我的应用程序中，我用viewWillAppear方法程序化地创建了一个左栏按钮项目，我有两次点击来做这件事，我的代码如下所示。

    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];

}