Uses modern version detection API instead of floating point comparison.

[steipete]

While the current way of checking for the version is not deprecated,
converting the system version string to float isn’t a good idea either.

The framework is for iOS 8 and above, so we can use the new Foundation API.

[Tricertops]

I would make a function.

[steipete]

I was debating extracting this into a macro or function, but wanted to keep it close to the original.

[jwe-apple]

Yep, looks good to me, but we should also remove the #if's while we're here. The project has nullability in the headers so pre-8.3 tools cannot be used anymore.

[Tricertops]

What about using +instancesRespondToSelector: check? Or that UIFont method was present (and private) before iOS 8.2?

[UIFont instancesRespondToSelector:@selector(systemFontOfSize:weight:)];

Edit: Not sure what about the other cases.

[steipete]

@jwe-apple: re __IPHONE_8_2: Good point, overlooked that. I've updated my PR.

[jwe-apple]

@iMartinKiss Just responding to the selector is not indicative whether the API was public in this case.

[jwe-apple]

Almost! Remove the HKBiologicalSexOther redefinition too, that was only for pre-8.2 tools.

[steipete]

Great. Deleting code is always fun :)

[JGiola]

I back @iMartinKiss and even for the check if the class can register to the HKUserPreferencesDidChangeNotification notification, as for the Apple documentation https://developer.apple.com/library/ios/documentation/DeveloperTools/Conceptual/cross_development/Using/using.html is better use a control in the like of
if (&HKUserPreferencesDidChangeNotification != NULL)