Objective C runtime - Associatet Objects问题

Question

我很想知道，我试图用

访问一个对象

id objc_getAssociatedObject(id object, void *key)

但是从

调用方法时它无效

-(void)encodeWithCoderOv:(NSCoder *)aCoder

它返回null。

请帮忙!!! 这是代码。

+ (void)load { 
    MethodSwizzle(self, @selector(encodeWithCoder:),@selector(encodeWithCoderOv:)); 
    MethodSwizzle(self, @selector(initWithCoder:),  @selector(initWithCoderOv:)); 
}


// this method will return associated Object when its being called from anywhere,but will
// return null when its being called from  encodeWithCoder.

- (id)getObject {
    return [self associatedObject];
}


- (id)associatedObject {
    return [objc_getAssociatedObject(self,&ObjectKey)retain];
}

- (void)setAssociatedObject:(UIImage*)newObject {
    objc_setAssociatedObject(self,&ObjectKey,newObject,OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

 -(void)encodeWithCoderOv:(NSCoder *)aCoder {
    [aCoder encodeObject:[self associatedObject] forKey:@"someKey"]; 
    NSLog(@"object in encoder %@",[self associatedObject]); //  object is null
}

Answer 1

传递ObjectKey，而不是＆amp; ObjectKey。