objective c - Watch Connectivity not working -

i trying create app can send information apple watch ios parent app. have written code when run watchconnectivity app, information not transfer between apple watch , parent ios app. may problem code or may because reason watch not start app. have go simulator , click on app started. why code not working?

interfacecontroller.m

#import "interfacecontroller.h" #import <watchconnectivity/watchconnectivity.h>  @interface interfacecontroller() <wcsessiondelegate>  @property (strong, nonatomic) wcsession *session;  @end  @implementation interfacecontroller  -(instancetype)init {     self = [super init];      if (self) {         if ([wcsession issupported]) {             self.session = [wcsession defaultsession];             self.session.delegate = self;             [self.session activatesession];         }     } return self; }   - (ibaction)catpressed {      [self sendtext:@"cat"]; } - (ibaction)dogpressed {      [self sendtext:@"dog"]; } - (ibaction)pandapressed {     [self sendtext:@"panda"]; } - (ibaction)bunnypressed {     [self sendtext:@"bunny"];  }  -(void)sendtext:(nsstring *)text {      nsdictionary *applicationdict = @{@"emoji":text};      [self.session updateapplicationcontext:applicationdict error:nil];  } 

viewcontroller.m

#import "viewcontroller.h" #import <watchconnectivity/watchconnectivity.h>  @interface viewcontroller () <wcsessiondelegate> @property (weak, nonatomic) iboutlet uilabel *textlabel;  @end  @implementation viewcontroller  - (void)viewdidload {      [super viewdidload];      if ([wcsession issupported]) {          wcsession *session = [wcsession defaultsession];          session.delegate = self;          [session activatesession];           nslog(@"hiiii");      }  }   - (void)session:(nonnull wcsession *)session didreceiveapplicationcontext:(nonnull nsdictionary<nsstring *,id> *)applicationcontext {      nsstring *text = [applicationcontext objectforkey:@"text"];      dispatch_async(dispatch_get_main_queue(), ^{     [self.textlabel settext:[nsstring stringwithformat:@"text: %@", text]];     }); } 

it turns out needed open parent app on iphone first start sharing information between iphone , watch. msu_bulldog suggesting idea.