On Mar 5, 2008, at 1:40 PM, Adam P Jenkins wrote:
If you define a @property in the interface, then in the
implementation you either need use @synthesize to have the compiler
automatically generate a getter and setter, or use @dynamic to
inform the compiler that you will provide the appropriately named
getter and setter methods.
There is no *need* to specify @dynamic. In fact, doing so will
conceal a bug (at least until runtime...) if you don't intend to
create the appropriate methods at runtime (as do, for example, managed
objects) but forget to provide an implementation. If you don't
specify @dynamic, then the compiler will warn you if you don't supply
appropriate methods at compile time.
If you need to define the accessors yourself because the auto-
generated ones don't do what you want, then use @dynamic instead
like this:
@implementation Person
@dynamic firstName;
- (NSString*)firstName { ... }
- (void)setFirstName:(NSString *)newName { ... }
@end
It's perfectly reasonable also to do either:
@implementation Person
- (NSString*)firstName { ... }
- (void)setFirstName:(NSString *)newName { ... }
@end
or, for example:
@implementation Person
@synthesize firstName;
- (void)setFirstName:(NSString *)newName { ... }
@end
In the latter case, the compiler will just synthesise -firstName.
One further issue for the sake of raising it:
@property (setter=mySetMethod:,getter=myMethod) id valueTest;
Note that this implies that the accessor methods are atomic. It's
comparatively rare (unless you're using GC) that Cocoa developers
implement atomic accessor methods, so you'd typically specify:
@property (nonatomic, setter=mySetMethod:,getter=myMethod) id valueTest;
mmalc
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