[英]Sort Array of dictionary in Swift
我从响应中获取数组如下
items=[{
"displayName": "Adam Codo",
"postedTime": "2011-04-04T21:31:20.000Z",
"message" : "Hello Test Message"
},
{
"displayName": "Leena",
"postedTime": "2011-04-04T20:32:20.000Z",
"message" : " Start Hello Test Message"
},
{
"displayName": "Zohn",
"postedTime": "2011-04-03T22:47:20.000Z",
"message" : "Hi Leena"
},
{
"displayName": "Leena",
"postedTime": "2011-04-04T21:32:20.000Z",
"message" : " Start Hello Test Message"
},
{
"displayName": "Adam Codo",
"postedTime": "2011-04-04T22:13:10.000Z",
"message" : "Hello Test Message"
}]
我已经按名称对数组进行排序,之后又按时间对数组进行了排序。 所以我需要像下面这样的排序数组
items=[
{
"displayName": "Adam Codo",
"postedTime": "2011-04-04T22:13:10.000Z",
"message" : "Hello reply Test Message"
},
{
"displayName": "Adam Codo",
"postedTime": "2011-04-04T21:31:20.000Z",
"message" : "Hello Test Message"
},
{
"displayName": "Leena",
"postedTime": "2011-04-04T21:32:20.000Z",
"message" : " Start Hello Test Message"
},
{
"displayName": "Leena",
"postedTime": "2011-04-04T20:32:20.000Z",
"message" : " Start Hello Test Message"
},
{
"displayName": "Zohn",
"postedTime": "2011-04-03T22:47:20.000Z",
"message" : "Hi Leena"
}
]
谁能建议我该怎么做? 任何想法都很棒。
相反,建立自己的模型,生活会更轻松。
这是模特
struct Element {
let displayName: String
let postedTime: Date
let message: String
init?(dict:[String:String]) {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSXXXXX"
guard
let displayName = dict["displayName"],
let timeText = dict["postedTime"],
let postedTime = dateFormatter.date(from: timeText),
let message = dict["message"]
else { return nil }
self.displayName = displayName
self.postedTime = postedTime
self.message = message
}
}
现在让它变得Comparable
extension Element: Comparable {
static func <(lhs: Element, rhs: Element) -> Bool {
if lhs.displayName != rhs.displayName {
return lhs.displayName < rhs.displayName
}
return lhs.postedTime < rhs.postedTime
}
static func ==(lhs: Element, rhs: Element) -> Bool {
return lhs.displayName == rhs.displayName && lhs.postedTime < rhs.postedTime
}
}
现在给出您的字典数组
let items = [
[
"displayName": "Adam Codo",
"postedTime": "2011-04-04T21:31:20.000Z",
"message" : "Hello Test Message"
],
[
"displayName": "Leena",
"postedTime": "2011-04-04T20:32:20.000Z",
"message" : " Start Hello Test Message"
],
[
"displayName": "Zohn",
"postedTime": "2011-04-03T22:47:20.000Z",
"message" : "Hi Leena"
],
[
"displayName": "Leena",
"postedTime": "2011-04-04T21:32:20.000Z",
"message" : " Start Hello Test Message"
],
[
"displayName": "Adam Codo",
"postedTime": "2011-04-04T22:13:10.000Z",
"message" : "Hello Test Message"
]
]
我们可以将其转换为一个元素数组,最后对其进行排序
let sortedElms = items.flatMap(Element.init).sorted()
结果
[
Element(displayName: "Adam Codo", postedTime: 2011-04-04 21:31:20 +0000, message: "Hello Test Message"),
Element(displayName: "Adam Codo", postedTime: 2011-04-04 22:13:10 +0000, message: "Hello Test Message"),
Element(displayName: "Leena", postedTime: 2011-04-04 20:32:20 +0000, message: " Start Hello Test Message"),
Element(displayName: "Leena", postedTime: 2011-04-04 21:32:20 +0000, message: " Start Hello Test Message"),
Element(displayName: "Zohn", postedTime: 2011-04-03 22:47:20 +0000, message: "Hi Leena")
]
var sortedResults = items.sorted {
(dictOne, dictTwo) -> Bool in
if dictOne["displayName"]! != dictTwo["displayName"]! {
return dictOne["displayName"]! < dictTwo["displayName"]!
}
return dictOne["postedTime"]! < dictTwo["postedTime"]!
};
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc]
initWithKey: @"displayName" ascending: YES];
NSArray *sortedArray = [_locations sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];
NSArray *sortedLocations = [_locations sortedArrayUsingComparator: ^(NSDictionary *d1, NSDictionary *d2) {
ISO8601DateFormatter *formatter = [[ISO8601DateFormatter alloc] init];
NSDate *theDate1 = [formatter dateFromString:[d1 valueForKey:@"postedTime"]];
NSDate *theDate2 = [formatter dateFromString:[d2 valueForKey:@"postedTime"]];
return [theDate1 compare:theDate2];
}];
要么
NSArray *sortedLocations = [_locations sortedArrayUsingComparator: ^(NSDictionary *d1, NSDictionary *d2) {
ISO8601DateFormatter *formatter = [[ISO8601DateFormatter alloc] init];
NSDate *theDate1 = [formatter dateFromString:[d1 valueForKey:@"postedTime"]];
NSDate *theDate2 = [formatter dateFromString:[d2 valueForKey:@"postedTime"]];
NSString *name1 = [d1 valueForKey:@"displayName"];
NSString *name2 = [d2 valueForKey:@"displayName"];
if ([name1 compare:name2]) {
return [theDate1 compare:theDate2];
}
return NSOrderedDescending;
}];
但是请问我没有检查
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