swift - Xcode 8 beta 6：AnyObject 替换为 Any：classForCoder 在哪里？

Question

Xcode 8 beta 6 已AnyObject被Any.

在某些情况下，我a.classForCoder出于调试原因使用它来查看其中的内容。有了AnyObject这个工作。有了Any这个不再起作用。

现在我必须使用Any：查看类型变量中的类型的首选方法是什么Any？

Casting toAnyObject似乎不是很有用，因为在许多情况下，这是一个String并且自 Xcode 8 beta 6 以来String不再确认。AnyObject

Answer 1

Using type(of:)

You can use type(of:) to find out what type of variable is in a variable of type Any.

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

---

Using classForCoder

classForCoder is still there, and you can cast a value of type Any to AnyObject, but if the value is a Swift value type, you'll get a converted result and not the original type:

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