NSKeyedArchiver被调用两次

Question

当我在iphone应用程序关闭时查看控制台时，看起来好像我的encodewithcoder被调用了两次。即使我只编码一次'NewsItems'一次。

这是正常的吗？

(void)encodeWithCoder:(NSCoder *)encoder { 
    NSLog(@"News encode called %@", self.title);  

    [encoder encodeObject:self.newsItemId forKey:KNewsItemNewsIdKey]; 
    [encoder encodeObject:self.title forKey:KNewsItemTitleKey]; 
    [encoder encodeObject:self.author forKey:KNewsItemAuthorKey]; 
    [encoder encodeObject:self.description forKey:KNewsItemDescriptionKey]; 
    [encoder encodeObject:self.imageUrl forKey:KNewsItemImageUrlKey]; 
    [encoder encodeObject:self.thumbnailUrl forKey:KNewsItemThumbnailUrlKey]; 
    [encoder encodeObject:self.createdAt forKey:KNewsItemCreatedAtKey]; 

    //Images 
    //convert from PNG to NSData, other method available for JPG 
    NSData *savedImageData = UIImagePNGRepresentation(self.savedImage); 
    [encoder encodeObject:savedImageData forKey:KNewsItemSavedImageKey]; 

    NSData *thumbnailImageData = UIImagePNGRepresentation(self.savedThumbnail); 
    [encoder encodeObject:thumbnailImageData forKey:KNewsItemSavedThumbnailKey]; 

} 


//code to encode 
    [archiver encodeObject:self.newsArray forKey:KNewsArrayDataKey]; 

Answer 1

把你NSLog()声明一个断点，并检查堆栈跟踪，看看谁在每次给你打电话。