本文介绍了在Swift中获取UIBarButtonItem的框架？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
如何在swift中获取rightbarbuttonItem的框架？我发现了这个：但是它说无法将NSString转换为UIView，或者无法将NSString转换为String：
how could I get the frame of a rightbarbuttonItem in swift? I found this : UIBarButtonItem: How can I find its frame? but it says cannot convert NSString to UIView, or cannot convert NSString to String :
let str : NSString = "view" //or type String
let theView : UIView = self.navigationItem.rightBarButtonItem!.valueForKey("view")//or 'str'
目标是删除rightBarButtonItem，改为添加imageView，并使用fadeOut效果移动它。
The goal is to remove the rightBarButtonItem, add an imageView instead, and move it with a fadeOut effect.
谢谢
推荐答案
您应该尝试：
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
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