ios - NSDate doesn't refresh -

the nsdate in first view controller wont refresh until go view controller , come it. idea why be?

viewdidload:

nstimer *timer = [nstimer scheduledtimerwithtimeinterval:1.0 target:self selector:@selector(fadein) userinfo:nil repeats:no];     [timer fire]; 

viewwillappear:

// date     nsdateformatter *formatter = [[nsdateformatter alloc] init];     [formatter setdatestyle:nsdateformatterfullstyle];     nsstring *datetoday = [formatter stringfromdate:[nsdate date]];     [datelabel settext:datetoday];     datelabel.font = [uifont fontwithname:@"helvetica-bold" size:12]; 

method:

-(void) fadein {     datelabel.alpha = 0;     [uiview beginanimations:nil context:nil];     [uiview setanimationdelay:1.0];     [uiview setanimationcurve:uiviewanimationcurveeasein];      [uiview setanimationdelegate:self];      [uiview setanimationduration:1.0];     datelabel.alpha = 1;      [uiview setanimationdidstopselector:@selector(animationdidstop:finished:context:)];     [uiview commitanimations]; } 

thanks!

edit: problem solved, people below helpful answers. looks other people didn't give answers closed question, both people gave answers below worked!

what @hotlicks saying fadein fine changing uilabel new date? need show changed date right?

-(void) fadein  {     //just example. change format in showing date.     nsdate *date = [nsdate date];     nsdateformatter *dateformat = [[nsdateformatter alloc] init];     [dateformat setdateformat:@"yyyy"];     uilabeldate.text = [dateformat stringfromdate:date];     ....   } 

update: worked @reez - oh have got now. not idea put such functions in viewwillappear view cached , method not called. better put method in viewdidload. see if works...