ios - Display seconds in a UILabel from a NSTimer which was selected from UIPickerView -

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how can display number of seconds in label nstimer?

imagevc.h  @property (weak, nonatomic) iboutlet uilabel *timelabel;  imagevc.m  -(void)viewdidappear:(bool)animated {     [super viewdidappear:animated];           imageviewcontroller *pickerview = [[imageviewcontroller alloc] init];             [nstimer scheduledtimerwithtimeinterval:10                                              target:self                                            selector:@selector(timeout)                                            userinfo:nil                                             repeats:no];         }];          }     }

any appreciated.

thanks

add timer 1 second interval updates label 

       -(void)viewdidappear:(bool)animated             {                 [super viewdidappear:animated];                       imageviewcontroller *pickerview = [[imageviewcontroller alloc] init];                         [nstimer scheduledtimerwithtimeinterval:10 target:self selector:@selector(timeout) userinfo:nil repeats:no];             [nstimer scheduledtimerwithtimeinterval:1 target:self selector:@selector(settimetolabel) userinfo:nil repeats:no];     } - (void)settimetolabel {      counterprivatevar += 1;      self.lbl.text = [nsstring stringwithformat:@"%d", counter]; }

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