在Swift中对字符串字典数组进行排序

Question

我正在尝试在Swift中对一系列字典进行排序.我的结构是这样的:

[
    [
        "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"
    ]
]

我正在尝试按Timestamp每个字典中的每个" "值对数组进行排序.我怎样才能做到这一点？

我目前的代码(不工作)是:

self.todayArray.sortInPlace {item1,item2 in

    let date1 = Int("\(item1["Timestamp"])")
    let date2 = Int("\(item2["Timestamp"])")

    return date1 > date2
}

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!你应该做更合适的事情,但这给你基本的想法:

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)")