从一个界面push到下一界面左上角返回按钮文字设置

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

   navigationbar的back键 触发其他事件
   UIButton *back =[[UIButton alloc] initWithFrame:CGRectMake(200, 25, 63, 30)]; 
   [back addTarget:self action:@selector(reloadRowData:) forControlEvents:UIControlEventTouchUpInside];
   [back setImage:[UIImage imageNamed:@"返回按钮.png"] forState:UIControlStateNormal];
   UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:back]; 
   self.navigationItem.leftBarButtonItem = loginButtonItem