Ios setRightBarButtonItems不'；行不通

我正在尝试在

UINavigationBar

右侧设置两个按钮。下面是源代码。没有错误，但也没有按钮。它是一个

UIViewController

，而不是

UINavigationViewController

let buttonEdit: UIButton = UIButton.buttonWithType(UIButtonType.Custom) as! UIButton
buttonEdit.frame = CGRectMake(0, 0, 40, 40)
buttonEdit.setImage(UIImage(named:"me44.png"), forState: UIControlState.Normal)
buttonEdit.addTarget(self, action: "rightNavItemEditClick:", forControlEvents: UIControlEvents.TouchUpInside)
var rightBarButtonItemEdit: UIBarButtonItem = UIBarButtonItem(customView: buttonEdit)

let buttonDelete: UIButton = UIButton.buttonWithType(UIButtonType.Custom) as! UIButton
buttonDelete.frame = CGRectMake(0, 0, 40, 40)
buttonDelete.setImage(UIImage(named:"me44.png"), forState: UIControlState.Normal)
buttonDelete.addTarget(self, action: "rightNavItemDeleteClick:", forControlEvents: UIControlEvents.TouchUpInside)

var rightBarButtonItemDelete: UIBarButtonItem = UIBarButtonItem(customView: buttonDelete)

// add multiple right bar button items       
self.navigationController?.navigationItem.setRightBarButtonItems([rightBarButtonItemDelete, rightBarButtonItemEdit] as [AnyObject], animated: true)

//I also tried code below no luck either
self.navigationItem.setRightBarButtonItems([rightBarButtonItemDelete, rightBarButtonItemEdit] as [AnyObject], animated: true)

---

这个代码是错误的：

self.navigationController?.navigationItem.setRightBarButtonItems(
    [rightBarButtonItemDelete, rightBarButtonItemEdit] as [AnyObject], animated: true)

您没有设置导航控制器的

导航项

；您可以设置

navigationItem

。而且，

[AnyObject]

这个东西是不必要的。因此：

self.navigationItem.setRightBarButtonItems(
    [rightBarButtonItemDelete, rightBarButtonItemEdit], animated: true)

但是，请注意，仅当视图控制器是UINavigationController的子级时，这种方法才有效。设置视图控制器的

navigationItem

仅在这种情况下自动填充导航栏。如果您不在这种情况下-即，如果您的界面中只有一个“松散”的导航栏-您需要手动填充导航栏（通过设置其

导航项

）

---

（另外，请注意，如果您没有

“me44.png”

图像，可能是您的代码正在工作，但您什么也看不到。）

尽管前面已经指出了所有这些，但您可能看不到导航栏上添加的按钮。对于Swift 3，请在AppDelegate类中尝试此操作（请注意topItem）：

---

它是UINavigationController中的UIViewController吗？多亏了你的信息，我使用了self.navBar.topItem？.RightBarButtonims=[RightBarButtonimDelete，RightBarButtonimedIt]，效果非常好。然而，大多数人所做的是使用UINavigationController，即使没有任何导航。这样，您就可以使用第一种方法。

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    window = UIWindow()
    window?.backgroundColor = UIColor.white

    let navigationVC = UINavigationController(rootViewController: UIViewController())

    let addButton = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(addTodo))
    navigationVC.navigationBar.topItem?.rightBarButtonItem = addButton

    window?.rootViewController = navigationVC
    window?.makeKeyAndVisible()

    return true
}