Sort Array of dictionary in Swift - ios

Question

I am getting an array from response as below
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"
}]
I have so sort the array by the name & later by the time. so I need sorted array like below
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"
}
]
Can anyone suggest me how to do this? Any idea would be great.

Answer 1

Do NOT use dictionaries
Build your own model instead and life will be easier.
Here's the model
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
}
}
Now let's make it 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
}
}
Now given your array of dictionaries
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"
]
]
we can convert it to an array of Element(s) and finally sorting it
let sortedElms = items.flatMap(Element.init).sorted()
Result
[
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")
]

Answer 2

var sortedResults = items.sorted {
(dictOne, dictTwo) -> Bool in
if dictOne["displayName"]! != dictTwo["displayName"]! {
return dictOne["displayName"]! < dictTwo["displayName"]!
}
return dictOne["postedTime"]! < dictTwo["postedTime"]!
};

Answer 3

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];
}];
OR
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;
}];
But be awere I did not check it