从一个界面push到下一界面左上角返回按钮文字设置（常用功能）

//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];
//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
[back release];
[backButtonItem release];