Question

我正在尝试使用Swift 2对包含大量词典的词典进行排序。

var dicListItems: [String: [String: AnyObject]] = [
    "Micke": ["LastName": "Andrius", "Age": 41],
    "Brian": ["LastName": "Zini", "Age": 35],
    "Frank": ["LastName": "Kramer", "Age": 28],
    "Derek": ["LastName": "Allen", "Age": 25]
]

我想以某种不同的方式排序：

1）来自姓氏：

[
    "Derek": ["LastName": "Allen", "Age": 25],
    "Micke": ["LastName": "Andrius", "Age": 41],
    "Frank": ["LastName": "Kramer", "Age": 28],
    "Brian": ["LastName": "Zini", "Age": 35]
]

2）来自FirstName：

[
    "Brian": ["LastName": "Zini", "Age": 35],
    "Derek": ["LastName": "Allen", "Age": 25],
    "Frank": ["LastName": "Kramer", "Age": 28],
    "Micke": ["LastName": "Andrius", "Age": 41]
]

3）从年龄：

[
    "Derek": ["LastName": "Allen", "Age": 25],
    "Brian": ["LastName": "Zini", "Age": 35],
    "Frank": ["LastName": "Kramer", "Age": 28],
    "Micke": ["LastName": "Andrius", "Age": 41]
]

Answer 1

您的情况有些问题：

Dictionary（和Set）是无序集合（不像数组https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/CollectionTypes.html#//apple_ref/doc/uid/TP40014097-CH8-ID105）。
您的演示数据中的“FirstName”在哪里？

我想你可以把你的数据转换成这种东西（它是一个可以排序的数组）：

var dicListItems: [[String : AnyObject]] = [
["FirstName" :"Micke", "LastName": "Andrius", "Age": 41],
["FirstName" : "Brian", "LastName": "Zini", "Age": 35],
["FirstName" : "Frank", "LastName": "Kramer", "Age": 28],
["FirstName" : "Derek", "LastName": "Allen", "Age": 25]
]

然后你可以使用swift的.sort函数来对你的数组进行排序。例如，这是FirstName的排序：

let dictListItems: [[String : AnyObject]] = [["FirstName" :"Micke", "LastName": "Andrius", "Age": 41],     ["FirstName" : "Brian", "LastName": "Zini", "Age": 35], ["FirstName" : "Frank", "LastName": "Kramer", "Age": 28], ["FirstName" : "Derek", "LastName": "Allen", "Age": 25]]

let sortedList = dictListItems.sort {
        item1, item2 in
        let firstName1 = item1["FirstName"] as! String
        let firstName2 = item2["FirstName"] as! String
        return firstName1.compare(firstName2) != NSComparisonResult.OrderedAscending
    }

Answer 2

第一个问题，它是Objective-C，而不是Swift。第二：你不能对Dictionary进行排序，你应该使用Array。 Swift 2中的解决方案如下：

var listItems = [
    ["FirstName": "Micke", "LastName": "Andrius", "Age": 41],
    ["FirstName": "Brian", "LastName": "Zini", "Age": 35],
    ["FirstName": "Frank", "LastName": "Kramer", "Age": 28],
    ["FirstName": "Derek", "LastName": "Allen", "Age": 25]
]
listItems.sortInPlace( { ($0["FirstName"] as! String) < ($1["FirstName"] as! String)} )
print(listItems)

显然你可以在排序条件下更改密钥。

将字典字典排序为字典

2 个答案: