ios - 在 Swift 中获取 UIBarButtonItem 的框架？

Question

我怎样才能快速获得 rightbarbuttonItem 的框架？我发现这个:UIBarButtonItem: How can I find its frame?但它说不能将 NSString 转换为 UIView，或者不能将 NSString 转换为 String:

let str : NSString = "view" //or type String
let theView : UIView = self.navigationItem.rightBarButtonItem!.valueForKey("view")//or 'str'

目标是删除 rightBarButtonItem，添加一个 imageView，并使用淡出效果移动它。

谢谢

Answer 1

你应该这样尝试:

var barButtonItem = self.navigationItem.rightBarButtonItem!
var buttonItemView = barButtonItem.valueForKey("view")

var buttonItemSize = buttonItemView?.size

编辑(Swift 3):

var barButtonItem = self.navigationItem.rightBarButtonItem!
let buttonItemView = barButtonItem.value(forKey: "view") as? UIView
var buttonItemSize = buttonItemView?.size