Array Sorting based on dictionary key:value in swift

Question

Hare is an array, i want to sort in ascending or descending order based on array dictionary key value.

//Array Model
[
 {
 arrival_time:"12:85"
 depart_time:"35:55"
 price:"55.30"
 },
 {
 arrival_time:"09:15"
 depart_time:"18:20"
 price:"10.50"
 },
 {
 arrival_time:"15:30"
 depart_time:"19:15"
 price:"101.50"
 }
]
//Here is my swift class and method
class SortClass: NSObject {
 @objc func sortBusses (array:[Bus], sortKey:String) -> [Bus] {
 //Sort array here...
 return array
 }
}

Note: I'm using Xcode 8.0, Objective-C bridging Swift

I'm new to swift. please guide me

Answer 1

You can use the sort function and valueForKey to retrieve the value of your sortKey given your Bus class is of type NSObject.

@objc func sortBusses (array:[Bus], sortKey:String) -> [Bus] {
 let sortValue: (Bus) -> String? = {
 0ドル.value(forKey: sortKey) as? String
 }
 return array.sorted {
 sortValue(0ドル.0)! < sortValue(0ドル.1)!
 }
 }

• Callam: Just noticed a mistake, the 0ドル refers to a pair of Bus objects that you are supposed to compare. You use 0ドル.0 and 0ドル.1 to access each object.
• Lokesh Chowdary: its giving error (expected type) in second character $ sign :(

Answer 2

I tried with your array by using sort descriptor

My Code :

 let arrayInput:NSArray = [["arrival_time":"12:85","depart_time":"35:55","price":"55.30"],
 ["arrival_time":"09:15","depart_time":"18:20","price":"10.50"],
 ["arrival_time":"15:30","depart_time":"19:15","price":"101.50"]];
 //descending order
 var descriptor: SortDescriptor = SortDescriptor(key: "arrival_time", ascending: false)
 var sortedResults: NSArray = arrayInput.sortedArray(using: [descriptor])
 print("sortedResults \(sortedResults)");

Hope it helps

Happy coding ...