前端之家收集整理的这篇文章主要介绍了
Swift学习函数和闭包，
前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。
import UIKit
var str = "Hello,playground"
//函数和闭包
//func 声明一个函数
func greet (name : String,day : String) ->String{
return "hello \(name),today is \(day)"
}
greet("Bob","Friday")
func getGasPrices()->(Double,double,Double){
return (3.59,3.69,3.79)
}
getGasPrices()
func sumof(numbers: Int...)->Int{
var sum = 0
for number in numbers{
sum += number
}
return sum
}
sumof()
sumof(43,45,100)
func returnFifteen() ->Int{
var y = 10
func add(){
y += 5
}
add()
return y
}
returnFifteen()
func makeIncrementer() ->(Int ->Int){
func addOne(numbew:Int)->Int{
return 1 + numbew
}
return addOne
}
var increment = makeIncrementer()
increment(7)
func hasAnyMatches(list:Int[],condition:Int ->Bool)->Bool{
for item in list {
if condition(item) {
return true
}
}
return false
}
func lessThanTen(number :Int)->Bool{
return number < 10
}
var numbers = [20,19,7,12 ]
hasAnyMatches(numbers,lessThanTen)
//闭包
numbers.map({
(number:Int) ->Int in
let result = 3 * number
return result
})
numbers.map({number in 3 * number})
sort ([1,5,3,12,21]) {$0 > $1}
