Swift閉包（Closure）

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文法： 

{ (parameters) ->return type in statements}

 執行個體：採用函數實現：

 

let names =["Chris", "Alex", "Ewa", "Barry", "Daniella"]funcbackwards(s1: String, s2: String) -> Bool {return s1 > s2}var reversed = sort(names, backwards)println(reversed)//sort 排序函數，backwards 通過定序的函數 採用閉包實現：var reversed = sort(names, { (s1: String, s2: String) -> Bool inreturn s1 > s2 })println(reversed)

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