swift数组乱序

//

//  Array-Catagory.swift

//  zjfae

//

//  Created by CJW on 17/5/12.

//  Copyright © 2017年 onight. All rights reserved.

//

import Foundation

import UIKit

extension Array{

    mutatingfunc randamArray() -> Array {

        var list =self

        for indexin 0..<list.count {

            let newIndex =Int(arc4random_uniform(UInt32(list.count-index))) + index

            if index != newIndex {

                swap(&list[index], &list[newIndex])

            }

        }

        self = list

        return list

        

    }

}