objective-c ARC readonly properties and private setter implementation

Question

Prior to ARC, if I wanted a property to be readonly to using it but have it writeable within the class, I could do:

// Public declaration
@interface SomeClass :          


        

Answer 1

You can redeclare your property as readwrite in interface extension:

@interface SomeClass()
@property (nonatomic, strong, readwrite) NSString *myProperty;
@end

Answer 2

Yes, that is adequate, but you don't even need that much.

You can do

- (void)setMyProperty:(NSString *)newValue
{ 
      myProperty = newValue;
}

The compiler will do the right thing here.

The other thing though, is you don't even need THAT. In your class extension you can actually respecify @property declarations.

@interface SomeClass : NSObject
@property (nonatomic, readonly, strong) NSString *myProperty;
@end

@interface SomeClass()
@property (nonatomic, readwrite, strong) NSString *myProperty;
@end

Doing that, you just need to synthesize and you have a private setter that is synthesized for you.