Question

我试图在Swift中对一组字典进行排序。我的结构是这样的：

  data = new[10];
  foreach(data[ii]) data[ii] = $urandom;

我试图按照每个＆＃34; [ [ "DateTime": "8/16/16, 4:00 PM", "Owner": "Teacher1", "Subject": "AP Euro", "Address": "Mr. Hughes\' Room", "Type": "Final", "Timestamp": "2016081616009498", "Location": "On Campus", "Duration": "50 min", "Members": "ownerKey,1,107434,109431" ], [ "DateTime": "7/29/16, 6:35 AM", "Owner": "109431", "Subject": "Algebra 2 Acc", "Address": "Library", "Type": "Quiz", "Timestamp": "2016072906356642", "Location": "On Campus", "Duration": "5 min", "Members": "ownerKey" ] ]＆＃34;对数组进行排序。每个字典中的值。我怎么能这样做？

我目前的代码（不工作）是：

Timestamp

Answer 1

N / M下面的所有内容，它是按DateTime字段排序，你试图对已经按字典顺序排序的Timestamp字段进行排序，所以只需使用：

foo.sortInPlace { $0["Timestamp"] < $1["Timestamp"] }

由于timestamp是一个字符串编码的日期，你需要先将它转换为更有用的东西，使用NSDateFormatter是最简单的方法：

这里有很多!你应该做一些更合适的事情，但这会给你一个基本的想法：

let foo = [
    [
        "DateTime": "8/16/16, 4:00 PM",
        "Owner": "Teacher1",
        "Subject": "AP Euro",
        "Address": "Mr. Hughes\' Room",
        "Type": "Final",
        "Timestamp": "2016081616009498",
        "Location": "On Campus",
        "Duration": "50 min",
        "Members": "ownerKey,1,107434,109431"
    ],
    [
        "DateTime": "7/29/16, 6:35 AM",
        "Owner": "109431",
        "Subject": "Algebra 2 Acc",
        "Address": "Library",
        "Type": "Quiz",
        "Timestamp": "2016072906356642",
        "Location": "On Campus",
        "Duration": "5 min",
        "Members": "ownerKey"
    ]
]

let formatter = NSDateFormatter()
formatter.dateFormat = "M/dd/yy, h:mm a"

let sorted = foo.sort {
    formatter.dateFromString($0["DateTime"]!)!.compare(formatter.dateFromString($1["DateTime"]!)!) != .OrderedDescending
}
print("\(sorted)")

在Swift中对字符串字典数组进行排序

1 个答案: