ios - Swift2: String to date, format it and back to string. Found nil -


i have date string: sun, 07 feb 2016 21:16:21 +0000

and need in: dd.mm.yyyy

following method throws fatal error: nil

if parsedelement == "date" {     if currentarticle.date.isempty {          let dateformatter = nsdateformatter()          dateformatter.dateformat = "eee, dd mmm yyyy hh:mm:ss z"         let tempdate = dateformatter.datefromstring(str)         dateformatter.dateformat = "dd.mm.yyyy"         let converteddate = dateformatter.stringfromdate(tempdate!)          currentarticle.date = converteddate      } }

debug:

str string "sun, 07 feb 2016 21:16:21 +0000"

tempdate nsdate? 2016-02-07 21:16:21 utc 0xe41bc67eba500000​

converteddate string "07.02.2016"

looks great, moment release "currentarticle.date = converteddate"​ says converteddate​ = nil

ideas?

ps: currentarticle.date == isempty

edit: if loop runs 5 times. if give currentarticle.date = str (only date string), debugger says:

1. str string "sun, 07 feb 2016 21:16:21 +0000"

2. str ""

3. str string "thu, 04 feb 2016 21:18:34 +0000"

4. str ""

5. str string "thu, 04 feb 2016 18:57:14 +0000"

you're getting fatal error:

unexpectedly found nil while unwrapping optional value -> tempdate

i assume you're getting error in line:

let converteddate = dateformatter.stringfromdate(tempdate!)

this because you're force unwrapping optional equal nil. should use optional binding unwrap it, i.e.:

if let tempdate = tempdate {     let converteddate = dateformatter.stringfromdate(tempdate)     currentarticle.date = converteddate }

now question of why date formatter not returning value str in instance data. can add else above optional binding code block display str in instance narrow down problem.


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