存档数据时发送到实例的无法识别的选择器（NSCoding） [英] Unrecognized selector sent to instance while archiving data (NSCoding)

问题描述

-(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存档对象时会出现无法识别的选择器发送到实例。

I have no idea why do I get "unrecognized selector sent to instance" when trying to archive an object.

推荐答案

您需要在您的Furniture对象中实现NSCoding协议：

You need to implement NSCoding protocol inside your Furniture object:

- (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;
}

基本上你指定应该写入（编码）和从文件中读取的内容（解码）。通常对于要存储在文件中的每个属性，您可以像我在示例中所做的那样。

Basically you specify what should be written (encoded) and read from a file (decoded). Usually for each property you want to store in a file, you make same as I did here in an example.

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