ios - setRightBarButtonItems不起作用

我试图在UINavigationBar的右边有2个按钮。下面是源代码。没有错误，但也没有按钮。这是一个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)

最佳答案

这段代码是错误的:

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

您没有设置导航控制器的navigationItem；您设置navigationItem。另外，[AnyObject]东西也是不必要的。所以:

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

但是，请注意，仅当您的视图控制器是UINavigationController的子级时，该方法才有效。设置视图控制器的navigationItem只会在这种情况下自动填充导航栏。如果您不在那种情况下(即，如果您的界面中只有一个“松散”的导航栏)，则需要手动填充导航栏(通过设置其navigationItem)。

(另外，请注意，如果没有"me44.png"图像，则可能是您的代码正在运行，但您什么都没看到。)

关于ios - setRightBarButtonItems不起作用，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/31142890/