hk_read_data_cycling_1.m

/**
 Request to read data from health application.
 */
- (void)requestToReadDataWithFinishBlock:(void (^)(NSError *error))finishBlock
{
    // read permission
    NSArray *readTypes = @[
                           [HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierDistanceCycling]
                           ];
    
    [self.healthStore requestAuthorizationToShareTypes:nil
                                             readTypes:[NSSet setWithArray:readTypes]
                                            completion:^(BOOL success, NSError * _Nullable error) {
                                                
                                                dispatch_sync(dispatch_get_main_queue(), ^{
                                                    
                                                    if (error) {
                                                        finishBlock(error);
                                                    } else {
                                                        finishBlock(nil);
                                                    }
                                                });
                                            }];
}