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闭包（相当于匿名函数）的几种情况 利用sorted()排序方法来进行示例 1、sorted()正常引用的情况 var str=["d","a","c","b"] var sort=str.sorted() //["a", "b", "c", "d"] 2、设置函数导致sorted()倒序 var str=["d","a","c","b"]
func sortdown(a:String,b:String)->Bool{
return a>b
}
var sort1=str.sorted(by:sortdown) //["d", "c", "b", "a"]
3、闭包进行改写 （1）最正常的改写 var str=["d","a","c","b"]
var sort1=str.sorted{(a:String,b:String)->Bool in //["d","c","b","a"]
return a>b
}
（2）利用函数自动推断，参数和返回值都可以自动推断，return也可以省略 var str=["d","a","c","b"]
var sort1=str.sorted{(a,b)in
a>b //["d","c","b","a"]
}
（3）利用快捷参数直接引用 var str=["d","a","c","b"]
var sort1=str.sorted{$0>$1} //["d","c","b","a"]
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