如何以升序对数组进行快速排序 2.3答案

【问题标题】：How to Sort an array in an ascending order swift 2.3如何以升序对数组进行快速排序 2.3
【发布时间】：2016-09-25 07:46:15
【问题描述】：

[{
msg = "Hi This is Jecky";
name = Susheel;
sender = 77;
timestamp = 1464241769520;
username = susheel;
}, {
msg = Dubai;
name = Jecky;
sender = 78;
timestamp = 1464246547147;
username = Jecky;
}, {
msg = "How are you ?";
name = Susheel;
sender = 77;
timestamp = 1464243480381;
username = susheel;
}, {
msg = "Aje dekhai nai";
name = Jecky;
sender = 78;
timestamp = 1464244974198;
username = Jecky;
}]

我有一个这样的数组。我想在 swift 2.3 或最新版本的 swift 中使用时间戳对这个数组进行排序。任何人都可以帮助我吗？

【问题讨论】：

升序是什么？姓名？时间戳？用户名？
对不起，我忘记了。这是时间戳
检查这个答案：stackoverflow.com/a/24685377/3202193
这是一个数组而不是 NSArray，所以 Sortdescriptor 在这里不起作用。
这正是我想要的！！！

标签： ios iphone arrays swift sorting

【解决方案1】：

let array=[
        [
            "msg":"Hi This is Jecky",
            "name":"Susheel",
            "sender":77,
            "timestamp":1464241769520,
            "username":"susheel",
        ],
        [
            "msg":"Dubai",
            "name":"Jecky",
            "sender":78,
            "timestamp":1464246547147,
            "username":"Jecky",
        ],
        [
            "msg":"How are you ?",
            "name":"Susheel",
            "sender":77,
            "timestamp":1464243480381,
            "username":"susheel",
        ],
        [
            "msg":"Aje dekhai nai",
            "name":"Jecky",
            "sender":78,
            "timestamp":1464244974198,
            "username":"Jecky",
        ],
    ]
    print("array = \(array)")
    let sortedArray=array.sort { (obj1, obj2) -> Bool in
        return (obj1["timestamp"] as! Double) < (obj2["timestamp"] as! Double)
    }
    print("sortedArray = \(sortedArray)")

【讨论】：

【解决方案2】：

如果您的数组是可变的，您可以使用sortInPlace

yourArray.sortInPlace{$0.timestamp < $1.timestamp}

如果没有，您可以从排序创建一个新数组，就像 Kristijan 建议的那样（尽管尾随闭包不需要括号）：

let newArray = yourArray.sort{$0.timestamp < $1.timestamp}

【讨论】：

【解决方案3】：

您可以使用扩展获得此功能：

extension NSArray{
 //sorting- ascending
  func ascendingArrayWithKeyValue(key:String) -> NSArray{
    let ns = NSSortDescriptor.init(key: key, ascending: true)
    let aa = NSArray(object: ns)
    let arrResult = self.sortedArray(using: aa as! [NSSortDescriptor])
    return arrResult as NSArray
  }

  //sorting - descending
  func discendingArrayWithKeyValue(key:String) -> NSArray{
    let ns = NSSortDescriptor.init(key: key, ascending: false)
    let aa = NSArray(object: ns)
    let arrResult = self.sortedArray(using: aa as! [NSSortDescriptor])
    return arrResult as NSArray
  }
}

这样使用：

 let array=[
      [
        "msg":"Hi This is Jecky",
        "name":"Susheel",
        "sender":77,
        "timestamp":1464241769520,
        "username":"susheel",
        ],
      [
        "msg":"Dubai",
        "name":"Jecky",
        "sender":78,
        "timestamp":1464246547147,
        "username":"Jecky",
        ],
      [
        "msg":"How are you ?",
        "name":"Susheel",
        "sender":77,
        "timestamp":1464243480381,
        "username":"susheel",
        ],
      [
        "msg":"Aje dekhai nai",
        "name":"Jecky",
        "sender":78,
        "timestamp":1464244974198,
        "username":"Jecky",
        ],
      ]

    let a = NSArray.init(array: array)
    let filArray = a.ascendingArrayWithKeyValue(key: "timestamp")
    print(filArray)

【讨论】：

【解决方案4】：

customArray.sortInPlace { 
  (element1, element2) -> Bool in
   return element1.someSortableField < element2.someSortableField
}

看看这个 https://www.hackingwithswift.com/example-code/arrays/how-to-sort-an-array-using-sort

【讨论】：

【解决方案5】：

按属性“时间戳”排序

array.sorted{$1["timestamp"] as? Long > $0["timestamp"] as? Long}

【讨论】：

【解决方案6】：

=> 首先，将您的 Json 转换为对象。（检查此链接以执行此操作：- http://roadfiresoftware.com/2015/10/how-to-parse-json-with-swift-2/）

=> 然后将 Array 声明为类型化数组，以便在迭代时调用方法：

var array : [yourObjectClassName] = []

=> 然后您可以简单地按以下方式对值进行排序：

array.sort({ $0.name > $1.name })

上面的示例按名称对所有数组进行排序。如果您需要按 timeStamp 排序，您可以将名称更改为 timeStamp ..etc

查看此链接了解更多排序示例：Swift how to sort array of custom objects by property value

【讨论】：

这看起来不像 JSON。
我指的是@fnc12 的答案并教它是 json ：p