大佬教程收集整理的这篇文章主要介绍了Swift学习：12.函数，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
func sayHello(personName: String) -> String {
let greeTing = "Hello," + personName + "!"
return greeTing
}
2.外部参数
func someFunction(externalParameterName localParameterName: Int) {}
func containsCharacter(#String: String,#characterToFind: Character) -> Bool {}
func arithmeticMean(numbers: Double...) -> Double {
var @R_353_10586@l: Double = 0
}
return @R_353_10586@l / Double(numbers.count)
}
arithmeticMean(1,2,3,4,5)
arithmeticMean(3,8,19)
func join(String s1: String,toString s2: String,withJoiner joiner: String = " ") -> String {
return s1 + joiner + s2
}
join(String: "Hello",toString: "world")
func swapTwoInts(inout a: Int,inout b: Int) {
let temporaryA = a
a = b
b = temporaryA
}
var someInt = 3
var anotherInt = 107
swapTwoInts(&someInt,&anotherInt)
func addTwoInts(a: Int,b: Int) -> Int {
return a + b
}
func multiplyTwoInts(a: Int,b: Int) -> Int {
return a * b
}
这两个函数的类型是(Int,int) -> Int,读作“这个函数类型，它有两个 Int 型的参数并返回一个 Int 型的值。”println("Hello,world")
}
这个函数的类型是() -> (),读作“没有参数，并返回 Void 类型的函数”func printMathResult(mathFunction: (Int,Int) -> Int,a: Int,b: Int) {
println("Result: \(@H_48_20@mathFunction(a,b))")
}
printMathResult(addTwoInts,5)
当printMathResult 被调用时，它被传入 addTwoInts 函数和整数3和5。它用传入3和5调用 addTwoInts，并输出结果：8。
func chooseStepFunction(BACkWARDs: Bool) -> (Int) -> Int {
func stepForWARD(input: Int) -> Int { return input + 1 }
func stepBACkWARD(input: Int) -> Int { return input - 1 }
return BACkWARDs ? stepBACkWARD : stepForWARD
}
func sayHello(#userName:String,age userAge:Int = 20)->String{
return "用户名：\(userName) 年龄：\(userAge)"
}
func getName()->(name:String,age:Int){
println("No return")
return ("sn",24)
}
func countPerson(names:String...){
for name in names{
println(Name)
}
}
//sayHello(name: "sn",age: 24)
//sayHello(userName: <#String#>,age: <#Int#>)
println(sayHello(userName: "sn"))
var people = getName()
println(people.Name)
countPerson("Helen","Tom","Jike")
var myName = "sn"
func changename(inout name:String){
name = name + "AAA"
}
changename(&@H_762_551@myName)
println(@H_762_551@myName)
func alignRight(var String:String,countNum:Int,pad:String) -> String{
let num = countNum - count(String)
if num < 1{
return String
}
else{
for _ in 1...num{
}
return String
}
}
let paddedString = alignRight(originalString,10,"-")
println(paddedString)
func addTwoInts (a:Int,b:Int)->Int{
return a+b
}
//var mathFunction:(Int,int)->Int = addTwoInts
var mathFunction = addTwoInts
var num = @H_48_20@mathFunction(2,3)
println(num)
func printMathResault(mathFunction:(Int,Int)->Int,a:Int,b:Int){
println("result is \(@H_48_20@mathFunction(a,b))")
}
printMathResault(@H_762_551@mathFunction,5)
func stepForWARD (input:Int)->Int{
return input+1
}
func stepBACkWARD(input:Int)->Int{
return input-1
}
func chooseStepFunction(BACkWARDs:Bool)->(Int)->Int{
return BACkWARDs ? stepBACkWARD : stepForWARD
}
var value = -34
let moveNearToZero = chooseStepFunction(value>0)
println("current value is \(value)")
value = moveNearToZero(value)
}
以上是大佬教程为你收集整理的Swift学习：12.函数全部内容，希望文章能够帮你解决Swift学习：12.函数所遇到的程序开发问题。
如果觉得大佬教程网站内容还不错，欢迎将大佬教程推荐给程序员好友。
本图文内容来源于网友网络收集整理提供，作为学习参考使用，版权属于原作者。
如您有任何意见或建议可联系处理。小编QQ：384754419，请注明来意。