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Category和Associative

Category,类目,可以为已有的类添加新的方法,但是要想在Category里扩展属性就要使用Runtime的Associative,使用Runtime来添加类目的属性。


static void * MyObjectMyCustomPorpertyKey = (void *)@"MyObjectMyCustomPorpertyKey";

@implementation MyObject (ExtendedProperties)

- (id)myCustomProperty
{
        return objc_getAssociatedObject(self, MyObjectMyCustomPorpertyKey);
}

- (void)setMyCustomProperty:(id)myCustomProperty
{
        objc_setAssociatedObject(self, MyObjectMyCustomPorpertyKey, myCustomProperty, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

@end


以上即是使用Associative把self和myCustomProperty两个对象进行关联,从而达到为类目添加属性的目的。


objc_setAssociatedObject(self, KEY_TAGSTRING, nil,OBJC_ASSOCIATION_RETAIN_NONATOMIC);   //可以用来断开Associative



Category和Associative