修改NavigationController中backbutton

在父viewController中如下设置:
    UIBarButtonItem *backbutton = [[UIBarButtonItem alloc]init];
    backbutton.title = @"返回列表";
    self.navigationItem.backBarButtonItem = backbutton;

    [backbutton release];

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或者在界面中添加了按钮之后，重新定义按钮的方法

    [self.backButton setAction:@selector(OnClick_btnBack:)];

    [self.backButton setTarget:self];

-(IBAction)OnClick_btnBack:(id)sender  {

    [self.navigationController popViewControllerAnimated:YES];

    //[self.navigationController pushViewController:self.navigationController.parentViewController animated:YES];

}