Swift bool 文字(Obj-C @YES @NO 等价物)

Question

在 Objective-C 中，您可以键入 @YES 而不是 [NSNumber numberWithBOOL:YES]。这使得代码更加整洁。

在 Swift 中，我必须编写 NSNumber.numberWithBool(true)，这有点难看。

在 Swift 中是否有等同于 @YES 和 @NO 的东西？

预先感谢您的帮助!

Answer 1

它是true 和false

xcrun swift
Welcome to Swift!  Type :help for assistance.
  1> import Foundation
  2> var t : NSNumber = true
t: __NSCFBoolean = {}
  3> var f : NSObject = false
f: __NSCFBoolean = {}
  4>

阅读:https://developer.apple.com/library/content/documentation/Swift/Conceptual/BuildingCocoaApps/WorkingWithCocoaDataTypes.html#//apple_ref/doc/uid/TP40014216-CH6-XID_43

Swift automatically bridges certain native number types, such as Int and Float, to NSNumber. This bridging lets you create an NSNumber from one of these types

All of the following types are automatically bridged to NSNumber:

• Int
• UInt
• Float
• Double
• Bool