CODEWITHSUNDEEP
iosarraysxcodeswiftdate
SentientBacon
SentientBacon

Reputation: 1559

Insert date string into array of ordered date strings at correct index

I have an array of dates that are in the form of strings, and I want to organize them by the oldest dates last. The circumstances are I have a list of dates(already organized), and I am inserting a date. For instance, I want to insert "08/23/2015" in

["08/27/2015", "08/27/2015", "08/25/2015", "08/21/2015"]

So it appears at index 3.

I tried:

        var id = -1
        var index = datesArray.dates.count
        let newDate = "08/23/2015"

        let dDateStr = stringFromDate("08/23/2015")
        let cDateStr = stringFromDate(NSDate())

        if dDateStr != cDateStr {
            while id < 0 && index > 0 {
                if dateFromString(dDateStr).timeIntervalSinceNow >= dateFromString(destView.dates[index]).timeIntervalSinceNow  {
                    id = index
                }
                index = index - 1
            }
            id = 0
        }
        else {
            id = 0
        }
        datesArray.insert(newDate, atIndex: id)

Yet, it always gives me id = -1. Any advice?

I am using Swift 1.2 on Xcode 6.4 for iOS 8

Upvotes: 2

Views: 501

Answers (1)

luk2302
luk2302

Reputation: 57114

I changed your code quite a bit but it works now (changed because I partially did not understand what your code was supposed to do exactly.):

func dateFromString (string:String) -> NSDate {
    let df = NSDateFormatter()
    df.dateFormat = "MM/dd/yyyy"
    return df.dateFromString(string)!
}

var datesArray = ["08/27/2015", "08/27/2015", "08/25/2015", "08/21/2015"]
var id = 0
var index = datesArray.count
let newDateString = "08/23/2015"
let newDate = dateFromString(newDateString).timeIntervalSinceNow

for index in 0..<datesArray.count {
    if dateFromString(datesArray[index]).timeIntervalSinceNow >= newDate {
        id = index + 1
    }
}

datesArray.insert(newDateString, atIndex: id)

Please note that it still is not the most performant code possible.

But it outputs

3

and can insert at the first and last position as well.

You may have to change the array reference and stuff like that because I do not know in what way you are planning to include this snippet.

Upvotes: 2

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