Instance Method

bloodTypeWithError:

Reads the user’s blood type from the HealthKit store.

Declaration

- (HKBloodTypeObject *)bloodTypeWithError:(NSError * _Nullable *)error;

Parameters

error

On input, a pointer to an error object. If an error occurs, this pointer is set to an actual error object containing information about the error. Specify nil for this parameter if you do not want to receive error information.

Return Value

A blood type object that contains information about the user’s blood type.

Discussion

If the user has not specified a blood type or if the user has denied your app permission to read the blood type, this method returns an HKBloodTypeNotSet value.

Topics

Possible Values

HKBloodTypeObject

This class acts as a wrapper for the HKBloodType enumeration.

HKBloodType

Constants indicating the user’s blood type.

See Also

Reading Characteristic Data

- biologicalSexWithError:

Reads the user’s biological sex from the HealthKit store.

- dateOfBirthWithError:

Reads the user’s date of birth from the HealthKit store.

Deprecated
- dateOfBirthComponentsWithError:

Reads the user’s date of birth from the HealthKit store.

- fitzpatrickSkinTypeWithError:

Reads the user’s Fitzpatrick Skin Type from the HealthKit store.

- wheelchairUseWithError:

Reads the user’s wheelchair use from the HealthKit store.