我想将归档(NSCoding)协议添加到我的模型类中,然后我实现这两个方法encodeWithCoder:(NSCoder*)coder
和initWithCoder:(NSCoder*)coder
. MyModelClass 有 2 个实例变量(NSString 和 NSImage),所以我使用该encodeObject:(id)object forKey:(NSString*)string
方法对对象加上特定键的值进行编码。但我一直收到错误:
*** -encodeObject:forKey: only defined for abstract class. Define -[NSArchiver encodeObject:forKey:]!
这是我的 NSCoding 方法代码:
- (id)initWithCoder:(NSCoder *)coder {
[super init];
mainPath = [[coder decodeObjectForKey:@"mainPath"] retain];
icon = [[coder decodeObjectForKey:@"icon"] retain];
return self;
}
- (void)encodeWithCoder:(NSCoder *)coder {
NSLog(@"encode with coder is called");
[coder encodeObject:mainPath forKey:@"mainPath"];
[coder encodeObject:icon forKey:@"icon"];
}
这就是我在控制器类中调用它们的方式:
id object = [assetArray objectAtIndex: [[rows lastObject] intValue]];
if ([object isKindOfClass:[ItemAssetModel class]])
NSLog(@"object is correct");
else
return NO;
NSData *data = [NSArchiver archivedDataWithRootObject: object];
如果我更改encodeObject:(id)obj forKey:(NSString*)str
with encodeObject:(id)obj
,则错误停止,但结果是,存档数据不会复制实例变量值(cmiiw)。我错过了什么吗?
谢谢。黑边