How to sort an array of dictionary by date?

Question

I am getting some post from Facebook for my application, I have all post data into a dictionary and that dictionary is in array. Now I have the post time from the Facebook which is in dictionary as string. I want to sort that array according to latest post which is known by the post time. I had seen several answers on SO but they did in a single dictionary I want to do that from different dictionary.

This is my array of dictionary from which I have to sort array according to dictionary postTime value.

Code:

var dateFormatter: NSDateFormatter = NSDateFormatter()
                    dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
                    var tempArray: NSMutableArray = NSMutableArray()
                    for var i = 0; i < dicts.count; i++ {
                        var dic: NSMutableDictionary = dicts[i] as! NSMutableDictionary
                        let dateConverted: NSDate = dateFormatter.dateFromString(dic["postTime"] as! String)!
                        dic["postTime"] = dateConverted
                        tempArray.addObject(dic)
                    }
                    var descriptor: NSSortDescriptor = NSSortDescriptor(key: "postTime", ascending: true)
                    var descriptors: NSArray = [descriptor]
                    var sortedArray: NSArray = tempArray.sortedArrayUsingDescriptors(descriptors as! [NSSortDescriptor])
                    NSLog("%@", sortedArray)

dicts is my array of dictionary and i have to take the post time which is seen in the image.

do you want to sort dictionary? dictionary is unsorted collection. in reality you would like to sort an array. — user3441734
– user3441734, Commented Feb 25, 2016 at 8:05

Yagnesh Dobariya · Accepted Answer · 2016-02-25 09:08:10Z

0

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
    dateFormatter.dateFormat = @"'Time: 'yyyy-MMM-dd HH:mm:ss";


    NSMutableArray *tempArray=[NSMutableArray new];
    for(NSInteger i=0;i<yourArrayOfDic.count ;i++){
        NSMutableDictionary *dic =[[NSMutableDictionary alloc] initWithDictionary:[yourArrayOfDic objectAtIndex:i]];
        NSDate *dateConverted = [dateFormatter dateFromString:[dic valueForKey:@"time"]];
        [dic setValue:dateConverted forKey:@"time"];
        [tempArray addObject:dic];
    }


    NSSortDescriptor *descriptor=[[NSSortDescriptor alloc] initWithKey:@"time" ascending:YES];
    NSArray *descriptors=[NSArray arrayWithObject: descriptor];
    NSArray *sortedArray=[tempArray sortedArrayUsingDescriptors:descriptors];
    NSLog(@"%@",sortedArray);

// In Swift.. i m weak in swift but objective c to swift may help u . let me know it work or not !!!!!

var dateFormatter: NSDateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "'Time: 'yyyy-MMM-dd HH:mm:ss"
var tempArray: NSMutableArray = NSMutableArray()
for var i = 0; i < yourArrayOfDic.count; i++ {
    var dic: NSMutableDictionary = yourArrayOfDic[i]
    var dateConverted: NSDate = dateFormatter.dateFromString(dic["time"])
    dic["time"] = dateConverted
    tempArray.addObject(dic)
}
var descriptor: NSSortDescriptor = NSSortDescriptor(key: "time", ascending: true)
var descriptors: NSArray = [descriptor]
var sortedArray: NSArray = tempArray.sortedArrayUsingDescriptors(descriptors)
NSLog("%@", sortedArray)

edited Feb 25, 2016 at 9:08

answered Feb 25, 2016 at 7:45

Yagnesh Dobariya

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4 Comments

shahin ali agharia Over a year ago

On this line let dateConverted: NSDate = dateFormatter.dateFromString(dic["postTime"]) it shows an error of Cannot convert value of type 'AnyObject?' to expected argument type 'String'.

Yagnesh Dobariya Over a year ago

var dateConverted: NSDate = dateFormatter.dateFromString(dic["time"] as! String)

shahin ali agharia Over a year ago

Now its getting crashed showing unexpectedly found nil while unwrapping an Optional value.

shahin ali agharia Over a year ago

Let us continue this discussion in chat.

Maulik Patel · Accepted Answer · 2019-04-16 14:35:03Z

0

IOS Swift 3.2

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
dateFormatter.timeZone = TimeZone(abbreviation: "GMT+0:00")
//   dateFormatter.locale = Locale.current
let tempArray: NSMutableArray = NSMutableArray()
for i in 0 ..< self.yourarr.count{
    var dicdata  = self.yourarr[i] as! [String : Any]

    var dateConverted = dateFormatter.date(from: dicdata["time"] as! String)
    dicdata["time"] = dateConverted
                    tempArray.add(dicdata)
 }
 var descriptor: NSSortDescriptor = NSSortDescriptor(key: "time", ascending: true)
 var descriptors: NSArray = [descriptor]
 var sortedArray: NSArray = tempArray.sortedArray(using: descriptors as! [NSSortDescriptor]) as NSArray
 NSLog("%@", sortedArray)

edited Apr 16, 2019 at 14:35

answered Apr 16, 2019 at 14:25

Maulik Patel

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