objective c - Link UIPickerView to NSTimer iOS -

i building app similar snapchat take picture or video , destructs after amount of time.

i implementing uipicker within camera module , once user take picture select time how long recipient sees picture, user sends image self destructs after 1-10 seconds.

how can link uipicker nstimer class?

camera.h  @property (strong, nonatomic) iboutlet uipickerview *timepicker; @property (nonatomic, strong) nsarray *pickerdata;   picker data in camera.m file: interface // {  int secs; } @end  - (void)viewdidload {     [super viewdidload];      self.pickerdata = @[@"1 second", @"2 seconds", @"3 seconds", @"4 seconds", @"5 seconds", @"6 seconds", @" 7 seconds", @" 8 seconds", @" 9 seconds", @" 10 seconds"];      self.timepicker.datasource = self;     self.timepicker.delegate = self; }  -(long)numberofcomponentsinpickerview:(uipickerview *)pickerview {     return 1; }  -(long)pickerview:(uipickerview *)pickerview numberofrowsincomponent:(nsinteger)component {     return self.pickerdata.count; }  - (nsstring*)pickerview:(uipickerview *)pickerview titleforrow:(nsinteger)row forcomponent:(nsinteger)component {     return self.pickerdata[row]; }   -(void)pickerview:(uipickerview *)pickerview didselectrow:(nsinteger)row incomponent:(nsinteger)component             {                //help here please             } - (ibaction)next:(id)sender { //goes select friends page } 

image.m file image displayed user: image should destruct after amount of time user selects picker.

-(void)viewdidappear:(bool)animated {     [super viewdidappear:animated];      if ([self respondstoselector:@selector(timeout)]) {      [nstimer scheduledtimerwithtimeinterval:7 target:self selector:@selector(timeout)                                    userinfo:nil repeats:no];      }  }  [timeout pops root view] 

i need let user select time on picker , image in image.m file destruct after amount of time.

the user take picture below picture pickerview user selects time , presses next go select friends. half of screen picture other half uipickerview

just pass data second view controller, 1 displaying image. :

-(void)pickerview:(uipickerview *)pickerview didselectrow:(nsinteger)row incomponent:(nsinteger)component {     // leave empty  }  - (void)buttonhandler:(uibutton *)sender {     image *ivc = [[image alloc] init];     ivc.seconds = [self.timepicker selectedrowincomponent:0];      [self presentviewcontroller:ivc animated:yes]; } 

and in imageviewcontroller.h you'd need :

@interface image : uiviewcontroller  @property (nonatomic, assign) nsuinteger seconds;  @end 

then use value passed in seconds property time timer in viewdidload in camera.m