问题
Does anybody know why NSControl's isEnabled has been removed while setEnabled: is still working?
回答1:
In OS X 10.10 (and iOS 8), many of the getter/setter method pairs in Apple's frameworks were replaced by @property declarations. This both makes the header interface clearer and makes the import of those APIs into Swift more... well, Swifty.
// Before
- (BOOL)isEnabled;
- (void)setEnabled:(BOOL)enabled;
// After
@property(getter=isEnabled) BOOL enabled
The documentation hasn't been fully updated to reflect that, so it erroneously shows isEnabled as deprecated, even though the @property declaration means you can still do any of the following:
BOOL foo = [control isEnabled];
[control setEnabled:YES];
BOOL bar = control.enabled;
control.enabled = YES;
来源：https://stackoverflow.com/questions/28706592/nscontrol-isenabled-only-available-in-os-x-v10-0-through-os-x-v10-9