在Swift中对字符串字典进行排序

我正在尝试对Swift中的字典数组进行排序。我的结构是这样的：在Swift中对字符串字典进行排序

[ 
    [ 
     "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" 
    ] 
]

我想在每个字典中的每个“Timestamp”价值排序的数组。我怎样才能做到这一点？

我当前的代码（不工作）是：

self.todayArray.sortInPlace {item1,item2 in 

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

    return date1 > date2 
}

来源

2016-07-29 Albert Ghar

你的时间戳可能是一个32位整数太大。使用'return Double（item1 [“Timestamp”]！）

N/M以下所有的东西，它是由DateTime字段进行排序，你要排序的时间戳字段这已经是字典序排序，所以只需使用：

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

由于时间戳是一个字符串编码的日期，你需要将其转换为第一的东西更实用，使用NSDateFormatter是最简单的方法：

有一个在这里有很多的!，你应该做更合适的东西，但是这给你的基本思路：

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)")

来源

2016-07-29 06:17:42

foo.sort {$ 0 [“Timestamp”] <$ 1 [“Timestamp”]}是foo.sortInPlace {$ 0 [“Timestamp”] <$ 1 [“Timestamp”]}？ –

取决于你想要什么。为了模仿你的原始代码，是的，sortInPlace是合适的。我只是尽量避免在大部分时间使用它。 –

在Swift中对字符串字典进行排序

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