向导航栏添加后退按钮

如果使用导航控制器:

MyViewController *_myViewController = [[MyViewController alloc] initWithNibName:@"MyViewController" bundle:nil];
[[self navigationController] pushViewController:_myViewController animated:YES];
UIBarButtonItem *_backButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStyleDone target:nil action:nil];
self.navigationItem.backBarButtonItem = _backButton;
[_backButton release], _backButton = nil;
[_myViewController release], _myViewController = nil;

如果您不使用导航控制器,请查看 Three20 style 用于制作自定义条形图按钮的组件。

我是按下面的方法做的

在VIEWDIDLOAD方法中,我有以下代码:

UINavigationBar *navBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 41)];
    navBar.delegate = self;

    UINavigationItem *backItem = [[UINavigationItem alloc] initWithTitle:@"Back"];
    [navBar pushNavigationItem:backItem animated:NO];
    [backItem release];

    UINavigationItem *topItem = [[UINavigationItem alloc] initWithTitle:@"Your Title"];
    [navBar pushNavigationItem:topItem animated:NO];
    topItem.leftBarButtonItem = nil;
    [topItem release];

    [self.view addSubview:navBar];
    [navBar release];

然后在头部添加与uinavigationbardelegate协议的一致性,并通过以下方式实现委托方法:

- (BOOL)navigationBar:(UINavigationBar *)navigationBar shouldPopItem:(UINavigationItem *)item
{
    //if you want to dismiss the controller presented, you can do that here or the method btnBackClicked

    return NO;
}

解决此问题的另一种方法是设置导航栏的items属性,而不是连续地将栏项推送到导航栏堆栈中:

//Define myFrame based on your needs
let navigationBar = UINavigationBar(frame: myFrame)
let backItem = UINavigationItem(title: "Back")
let topItem = UINavigationItem(title: "My Title")
navigationBar.setItems([backItem,topItem], animated: false)