ios - Swift: Required initializer giving me an error message -


i have class named alarm inheriting nsobject, , in it, have property i'm having issue with, alarmlasttriggereddate:

class alarm: nsobject {     var alarmlasttriggereddate: nsdate      override init() {         super.init()     }      func encodewithcoder(acoder: nscoder) {         acoder.encodeobject(alarmlasttriggereddate, forkey: "alarmlasttriggereddate")     }      required init(coder adecoder: nscoder) {         if let alarmlasttriggereddatedecoded = adecoder.decodeobjectforkey("alarmlasttriggereddate") as? nsdate         {             alarmlasttriggereddate = alarmlasttriggereddatedecoded         }     } }

i'm new swift, , not sure why i'm getting following errors:

@override init: property 'self.alarmlasttriggereddate' not initialized @ super.init call @required init: property 'self.alarmlasttriggereddate' not initialized @ implicitly generated super.init call

it seems way fix problem initialized in both places, that's redundant code, , seems wrong. missing something?

the compiler must sure every non optional property initialized:

  • before call super init performed
  • and before object initialisation has been completed

that's why need populate alarmlasttriggereddate inside bot initializers.

and no, it's not redundant code since use 1 of 2 initializers create alarm object.


-

Comments

Post a Comment

Popular posts from this blog

amazon web services - S3 Pre-signed POST validate file type? -

i know it's possible put limit on file size content-length-range header. possible validate file type? https://docs.aws.amazon.com/amazons3/latest/dev/httppostforms.html#policyconditions i see there content-type header, if set say, audio/mp3 allow mp3 files , return error if file not mp3? i found previous question answers mention validating file size: s3 direct upload restricting file size , type you can specify content-type @ post request. you can specify @ signature, post must done content-type: { "expiration": "2007-12-01t12:00:00.000z", "conditions": [ {"acl": "public-read" }, {"bucket": "johnsmith" }, {"content-type: "audio/mp3"} ] } creating html form (using aws signature version 4) edit: @ previous question found, checking content-type.
Read more

c# - Check Keyboard Input Winforms -

i wondering if instead of doing this protected override void onkeydown(keyeventargs e) { if (e.keycode == keys.a) console.writeline("the key down."); } i set bool method , this: if(keydown(keys.a)) // whatever here i've been sitting here ages trying figure out how it. can't wrap head around it. in case wondering, plan call bool inside different method, check input. since want perform action after pressing key, using keydown event enough. but in cases suppose want check if specific key down in middle of process, can use getkeystate method way: [dllimport("user32.dll", charset = charset.auto, exactspelling = true)] public static extern short getkeystate(int keycode); public const int key_pressed = 0x8000; public static bool iskeydown(keys key) { return convert.toboolean(getkeystate((int)key) & key_pressed); } you should know, each time check key state using example iskeydown(keys.a) method returns true if ke...
Read more