【Swift初见】Swift闭包

标签：ios   swift   闭包   

闭包有三种形式：

{ (parameters) -> return type in
statements
}

let names = ["Chris", "Alex", "Ewa", "Barry", "Daniella"]

func backwards(s1 : String , s2 : String) -> Bool {
    return s1 > s2
}
var reserve = sorted(names, backwards)
println(reserve)

[Ewa, Daniella, Chris, Barry, Alex]

var reserved = sorted(names, {(s1 : String , s2 : String) -> Bool in
    return s1 > s2
})
println(reserved)

得到的输出为：

[Ewa, Daniella, Chris, Barry, Alex]

var reserved1 = sorted(names, {s1 , s2 in return s1 > s2})
println(reserved1)

var reserved2 = sorted(names, {(s1 : String , s2 : String) -> Bool in  s1 > s2 })
println(reserved2)

let intNumbers = [2, 3, 4, 5]
var reserved3 = sorted(intNumbers, { $0 > $1 })
println(reserved3)

得到的结果是：

[5, 4, 3, 2]

【Swift初见】Swift闭包

标签：ios   swift   闭包   

原文地址：http://blog.csdn.net/weasleyqi/article/details/43968859