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exitLoop: for i in 0...100 { print("i=\(i)") if i == 50 { // break } else { for j in 0...100 { print("j=\(j)") if j == 50 { break exitLoop } } } } 参考: https:

位运算了解一下,哈哈哈哈哈哈... Person.swift import Foundation extension Bool { init(_ integer: Int){ self.init(integer != 0) } } struct Person { let TallMask = (0b00000001 << 0b00000000) let RichMask = (0b00000001 << 0b00000001) let HandsomeMask = (0b00000001 <

A protocol defines a blueprint of methods, properties, and other requirements that suit a particular task or piece of functionality. The protocol can then be adopted by a class, structure, or enumeration to

通用代码使您能够根据您定义的要求编写可以使用任何类型的灵活，可重用的函数和类型。您可以编写避免重复的代码，并以清晰，抽象的方式表达其意图。 泛型是Swift最强大的功能之一，Swift标准库的大部分内容都是使用通用代码构建的。 import Foundation //泛型函数 func swapTwoValues<T>(_ a: inout T, _ b: inout T) { let tmp = a a = b b = tmp } var a = 1, b = 2