ios - How to read the height and weight data that we enter in the health app to our custom app -

how read height , weight data values enter in health app our custom app?

1. request healthkit authorization:

- (void)checkhealthstoreauthorization {     if ([hkhealthstore ishealthdataavailable]) {         nsset *readdatatypes = [self datatypestoread];          if (!self.healthstore) {             self.healthstore = [[hkhealthstore alloc] init];         }          static nsinteger = 0;         (hkobjecttype * quantitytype in readdatatypes) {             if ([self.healthstore authorizationstatusfortype:quantitytype] == hkauthorizationstatusnotdetermined) {                 [self.healthstore requestauthorizationtosharetypes:nil readtypes:readdatatypes completion:^(bool success, nserror *error) {                     i++;                     if (!success) {                         if (error) {                             nslog(@"requestauthorizationtosharetypes error: %@", error);                         }                         return;                     } else {                         if (i == [readdatatypes count]) {                             static dispatch_once_t oncetoken;                             dispatch_once(&oncetoken, ^{                                 [self getheight];                                 [self getweight];                             });                         }                     }                 }];             } else {                 if ([quantitytype isequal:[hkobjecttype quantitytypeforidentifier:hkquantitytypeidentifierheight]]) {                     [self getheight];                 } else if ([quantitytype isequal:[hkobjecttype quantitytypeforidentifier:hkquantitytypeidentifierbodymass]]) {                     [self getweight];                 }             }         }     } }  - (nsset *)datatypestoread {     hkquantitytype *height = [hkobjecttype quantitytypeforidentifier:hkquantitytypeidentifierheight];     hkquantitytype *weight = [hkobjecttype quantitytypeforidentifier:hkquantitytypeidentifierbodymass];     return [nsset setwithobjects:height, weight, nil]; } 

2. height , weight:

- (void)getheight {     nsdatecomponents *interval = [[nsdatecomponents alloc] init];     interval.month = 1;     hkquantitytype *quantitytype = [hkobjecttype quantitytypeforidentifier:hkquantitytypeidentifierheight];      hkstatisticscollectionquery *query =     [[hkstatisticscollectionquery alloc] initwithquantitytype:quantitytype                                       quantitysamplepredicate:nil                                                       options:hkstatisticsoptiondiscreteaverage                                                    anchordate:[nsdate date]                                            intervalcomponents:interval];      query.initialresultshandler = ^(hkstatisticscollectionquery *query, hkstatisticscollection *results, nserror *error) {         if (error) {             nslog(@"an error occurred while retrieving body mass: %@", error);         }          [results enumeratestatisticsfromdate:[self startdate]                                       todate:[nsdate date]                                    withblock:^(hkstatistics *result, bool *stop) {                                        hkquantity *quantity = result.averagequantity;                                         const int month = 30 * 24 * 60 * 60;                                        static bool islastmonthresult;                                        static double lastheight;                                         if ([[nsdate date] timeintervalsincedate:result.startdate] < month) {                                            islastmonthresult = yes;                                            if (!quantity && lastheight > 0.0) {                                                nslog(@"height: %lf", lastheight);                                            }                                        }                                         if (quantity) {                                            lastheight = [quantity doublevalueforunit:[hkunit meterunit]] * 100;                                            if (islastmonthresult) {                                                nslog(@"height: %lf", lastheight);                                            }                                        }                                    }];     };      [self.healthstore executequery:query]; }  - (void)getweight {     nsdatecomponents *interval = [[nsdatecomponents alloc] init];     interval.month = 1;     hkquantitytype *quantitytype = [hkobjecttype quantitytypeforidentifier:hkquantitytypeidentifierbodymass];      hkstatisticscollectionquery *query =     [[hkstatisticscollectionquery alloc] initwithquantitytype:quantitytype                                       quantitysamplepredicate:nil                                                       options:hkstatisticsoptiondiscreteaverage                                                    anchordate:[nsdate date]                                            intervalcomponents:interval];      query.initialresultshandler = ^(hkstatisticscollectionquery *query, hkstatisticscollection *results, nserror *error) {         if (error) {             nslog(@"an error occurred while retrieving body mass: %@", error);         }          [results enumeratestatisticsfromdate:[self startdate]                                       todate:[nsdate date]                                    withblock:^(hkstatistics *result, bool *stop) {                                        hkquantity *quantity = result.averagequantity;                                         const int month = 30 * 24 * 60 * 60;                                        static bool islastmonthresult;                                        static double lastweight;                                         if ([[nsdate date] timeintervalsincedate:result.startdate] < month) {                                            islastmonthresult = yes;                                            if (!quantity && lastweight > 0.0) {                                                nslog(@"weight: %lf", lastweight);                                            }                                        }                                         if (quantity) {                                            lastweight = [quantity doublevalueforunit:[hkunit gramunit]] / 1000;                                            if (islastmonthresult) {                                                nslog(@"weight: %lf", lastweight);                                            }                                        }                                    }];     };      [self.healthstore executequery:query]; }  - (nsdate *)startdate {     nscalendar *calendar = [nscalendar currentcalendar];     nsdatecomponents *components = [calendar components:nscalendarunitday | nscalendarunitmonth | nscalendarunityear fromdate:[nsdate date]];     components.hour = 0;     components.year -= 1;     nsdate *startdate = [calendar datefromcomponents:components];     return startdate; }