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注意:数据请求要在info.plist文件里加上App Transport Security Settings并设置Allow Arbitrary Loads为YESAppDelegate.swiftimport UIKitimport CoreData@UIApplicationMainclass AppDelegate: UIResponder, UIApplicationDelegate

import Foundationclass IntArray{ //嵌套定义一个表示异常信息的枚举 enum ArrayError:Error { case EmptyError,OutOfRangeError } var array = [Int]() func show(i:Int)throws -> Void { guar

import Foundation//给Double添加延展extension Double{ var km:Double{ get{ return self*0.5 } } var m:Double{ get{ return 500*self } }

import Foundation//协议protocol Print { var name: String {set get} init(name: String) func printContents(content:String) -> Void}//协议继承protocol Show:Print { func show() -> Void}struc

import Foundationprotocol A { func show() -> Void}protocol B { func eat() -> Void}protocol C: A,B{ func run() -> Void}class One: A { func show() { print("A类的show方法") }}c

import Foundationfunc exchange<T>(a:inout T,b:inout T) -> Void { let temp = a a = b b = temp}var x = 10var y = 20print(x,y)exchange(a: &x, b: &y)print(x,y)var str1 = "china"var str2 = "

import Foundationprotocol Show { func showMessage()}protocol Print { //实例方法 var printName:String {get set} //可读写 var factory:String {get} //只读 func show() -> Void func disp

import Foundationclass Huamn { var name = "" var age = 0 func show() -> Void { print("\(name)") } func run() -> Void { print("run") }}var h = Huamn()h.name = "旺旺

import Foundationclass Complex { var real = 0 var virtual = 0 init(real: Int,virtual: Int) { self.real = real; self.virtual = virtual } func show() -> Void {

编写一个程序，能交换两个变量的数值 例如： 变量a值为20，变量b值为30，调用函数后，a的值变为30，b 的值变为20答案: -func swap(a: inout Int , b:inout Int){ let temp = a a = b b = temp } var x = 20

import Foundationclass Complex { var real = 0 // 实部 var virtual = 0 // 虚部 func add(other:Complex)->Complex{ let sum:Complex = Complex() sum.real = self.real + other.real