如何确定HKQuantitySample数量类型？

Question

I am trying to determine what kind of HKQuantityTypeIdentifier matches the measurements provided in a particular Health Kit sample To determine this, I have tried the following:

if(hkSample.quantityType == HKQuantityTypeIdentifierDistanceCycling) ...

if([hkSample.quantityType isEqual: HKQuantityTypeIdentifierDistanceCycling]) ...

and

if([hkSample.quantityType isEqualToString: HKQuantityTypeIdentifierDistanceCycling]) ...

The first two options run but give a negative result even when the types should be matching and the last option gives a run-time NSException error for an unknown method. What's the proper way to determine which type maths an HKQuantitySample type?

Answer 1

quantityType is an HKQuantityType, not a string, so it doesn't respond to -isEqualToString: . You need to compare it with another HKQuantityType via -isEqual: , like this:

if ([hkSample.quantityType isEqual:[HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierDistanceCycling]])