swift – Xcode 8 beta 6：AnyObject被Any替换：哪里是classForCoder？

Xcode 8 beta 6已经取代Any的AnyObject.

在某些情况下,我使用a.classForCoder进行调试,以查看其中的内容.使用AnyObject,这很有效.随着任何这不再起作用.

现在我必须使用Any：在Any类型的变量中查看哪种类型的首选方法是什么？

转换为AnyObject似乎不是很有用,因为在许多情况下这是一个字符串,并且自Xcode 8 beta 6以来字符串不再向AnyObject确认.

使用类型(:)

您可以使用type(of :)来查找Any类型变量中的变量类型.

let a: Any = "hello"
print(type(of: a))  // String

let b: Any = 3.14
print(type(of: b))  // Double

import Foundation
let c: Any = "hello" as Nsstring
print(type(of: c))  // __NSCFString

let d: Any = ["one": 1,"two": "two"]
print(type(of: d))  //  Dictionary<String,Any>

struct Person { var name = "Bill" }
let e: Any = Person()
print(type(of: e))  // Person

使用classForCoder

classForCoder仍然存在,您可以将Any类型的值强制转换为AnyObject,但如果该值是Swift值类型,您将获得转换结果而不是原始类型：

import Foundation // or import UIKit or import Cocoa

let f: Any = "bye"
print((f as AnyObject).classForCoder)  // Nsstring
print(type(of: f))                     // String

let g: Any = 2
print((g as AnyObject).classForCoder)  // NSNumber
print(type(of: g))                     // Int

let h: Any = [1: "one",2: 2.0]
print((h as AnyObject).classForCoder)  // NSDictionary
print(type(of: h))                     // Dictionary<Int,Any>

struct Dog { var name = "Orion" }
let i: Any = Dog()
print((i as AnyObject).classForCoder)  // _SwiftValue
print(type(of: i))                     // Dog

// For an object,the result is the same
let j: Any = UIButton()
print((j as AnyObject).classForCoder)  // UIButton
print(type(of: j))                     // UIButton