ios - 归档数据时发送到实例的无法识别的选择器(NSCoding)

Question

-(void)transformObjects:(NSMutableArray*)array key:(NSString*)key
{
    NSMutableArray* archiveArray = [[NSMutableArray alloc]initWithCapacity:array.count];

    for (Furniture *furniture in array) {

        // The error occurs on the line below
        NSData *furnitureEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:furniture];
        [archiveArray addObject:furnitureEncodedObject];
    }

    NSUserDefaults *userData = [NSUserDefaults standardUserDefaults];
    [userData setObject:archiveArray forKey:key];
}

错误日志:

2014-03-04 10:55:27.881 AppName[10641:60b] -[Furniture encodeWithCoder:]: unrecognized selector sent to instance 0x15d43350

我不知道为什么在尝试归档对象时会收到“无法识别的选择器发送到实例”。

Answer 1

您需要在 Furniture 对象中实现 NSCoding 协议(protocol):

- (void)encodeWithCoder:(NSCoder *)aCoder{
  [aCoder encodeObject:self.yourpoperty forKey:@"PROPERTY_KEY"];
}

-(id)initWithCoder:(NSCoder *)aDecoder{
  if(self = [super init]){
    self.yourpoperty = [aDecoder decodeObjectForKey:@"PROPERTY_KEY"];
  }
  return self;
}

基本上，您指定应该写入(编码)和从文件中读取(解码)的内容。通常对于您想要存储在文件中的每个属性，您都可以像我在此处的示例中所做的那样。