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Subclassing with Properties

You can override a readonly property to make it writable. For example, you could define a class MyInteger with a readonly property, value: 

@interface MyInteger : NSObject
{
    NSInteger value;
}
@property(readonly) NSInteger value;
@end
 
@implementation MyInteger
@synthesize value;
@end

You could then implement a subclass, MyMutableInteger, which redefines the property to make it writable:

@interface MyMutableInteger : MyInteger
@property(readwrite) NSInteger value;
@end
 
@implementation MyMutableInteger
@dynamic value;
 
- (void)setValue:(NSInteger)newX
{
    value = newX;
}
@end


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Last updated: 2008-02-05

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