Question

我有一个Array：var messageArray = [AnyObject]()，Array中有一个元组，其中包含Dictionaries个10个键/值对（其中9个不重要）排序）：var messageDetailDict = [String: AnyObject]()

获取和设置这些值都可以正常工作，但现在我想按Array 的值（而不是键）对Dictionary进行排序。

示例 - ＆gt; Array的元组包含多个Dictionaries：

Dictionary（Array中的第一个元素）中的键是：＆＃39; ReceivedAt＆＃39;其值为21-03-2015

Dictionary中的密钥（Array中的第二个元素）是：＆＃39; ReceivedAt＆＃39;其值为20-03-2015

Dictionary中的密钥（Array中的第三个元素）是：＆＃39; ReceivedAt＆＃39;其值为15-03-2015

现在应该对Array进行排序，以便“接收到”的值为“{1}}。将从最早的日期到最后的日期排序。

希望这是有道理的，但有点难以解释。谢谢！

编辑＆gt;＆gt;＆gt;＆gt;＆gt;

这是println(messageArray)输出：

[(
    {
    ConversationId = "94cc96b5-d063-41a0-ae03-6d1a868836fb";
    Data = "Hello World";
    Id = "eeb5ac08-209f-4ef0-894a-72e77f01b80b";
    NeedsPush = 0;
    ReceivedAt = "/Date(1439920899537)/";
    SendAt = "/Date(1436620515000)/";
    Status = 0;
    },
    {
    ConversationId = "94cc96b5-d063-41a0-ae03-6d1a868836fb";
    Data = "Hello World";
    Id = "86b8766d-e4b2-4ef6-9112-ba9193048d9d";
    NeedsPush = 0;
    ReceivedAt = "/Date(1439921562909)/";
    SendAt = "/Date(1436620515000)/";
    Status = 0;
    }
)]

使用以下方法将收到的日期转换为字符串（我确实认为这不重要，因为它是一个时间间隔，因此可以排序）：

func getTimeStampFromAPIValue(dateTimeReceived: String) -> String {
    let newStartIndex = advance(dateTimeReceived.startIndex, 6)
    let newEndIndex = advance(dateTimeReceived.endIndex, -2)

    let substring = dateTimeReceived.substringWithRange(newStartIndex..<newEndIndex) // ell
    let receivedAtValueInInteger = (substring as NSString).doubleValue
    let receivedAtValueInDate = NSDate(timeIntervalSince1970:receivedAtValueInInteger/1000)

    //format date
    var dateFormatter = NSDateFormatter()
    dateFormatter.dateFormat = "dd-MM-yy hh:mm"
    var dateString = dateFormatter.stringFromDate(receivedAtValueInDate)

    return dateString
}

Answer 1

由于ReceivedAt的值是时间戳作为字符串，您可以应用以下算法：

var sortedArray = messageArray.sorted { (dict1, dict2) in

    // Get the ReceivedAt value as strings
    if let date1String = dict1["ReceivedAt"] as? String,
       let date2String = dict2["ReceivedAt"] as? String {

        // Compare the date strings to find the earlier of the two
        return date1String.compare(date2String) == .OrderedAscending
    }

    // Couldn't parse the date, make an assumption about the order
    return true
}

Answer 2

尝试此操作，如果需要按相反的顺序更改OrderedAscending OrderedDescending

messageArray.sortInPlace {
    ($0["ReceivedAt"] as! NSDate).compare($1["ReceivedAt"] as! NSDate) == .OrderedAscending
}

对位于数组

2 个答案: