iOS对象的归档-创新互联

对象归档的定义：

对象归档就是将对象归档以文件的形式保存到磁盘中，使用的时候以该文件保存的路径读取文件中的内容

使用NSKeyedArichiver进行归档、NSKeyedUnarchiver进行接档，这种方式会在写入、读出数据之前对数据进行序列化、反序列化操作。

单对象归档，多个对象归档，自定义对象归档

常用的归档一般用在工具类中，对不可变的数据进行归档，可变的数据不进行归档，用起来更加方便

 //1.一个对象归档

  NSString *homeDictionary = NSHomeDirectory();//获取根目录

  NSString *homePath = [homeDictionary stringByAppendingPathComponent:@"archiver.data"];//添加储存的文件名

  //归档 toFile:路径 archiveRootObject:id对象

  [NSKeyedArchiver archiveRootObject:@"对象" toFile:homePath];

  //接档

  id object = [NSKeyedUnarchiver unarchiveObjectWithFile:homePath];

  NSLog(@"%@",object);

  //2.将多个对象归档

  NSMutableData *data = [NSMutableData data];

  //归档

  NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];

  int aInt = 100;

  NSString *aString = @"I is an Apple";

  NSDictionary *aDict = @{@"a":@"b",@"c":@"d"};

  [archiver encodeObject:@(aInt) forKey:@"aInt"];

  [archiver encodeObject:aString forKey:@"aString"];

  [archiver encodeObject:aDict forKey:@"aDict"];

  [archiver finishEncoding];

  NSString *dataHomePath = [NSHomeDirectory() stringByAppendingPathComponent:@"data.archiver"];

  [data writeToFile:dataHomePath atomically:YES];

  //接档

  NSMutableData *muData = [[NSMutableData alloc]initWithContentsOfFile:dataHomePath];

  NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc]initForReadingWithData:muData];

  NSInteger anInt = [[unarchiver decodeObjectForKey:@"aInt"] integerValue];

  NSString *anString = [unarchiver decodeObjectForKey:@"aString"];

  NSDictionary *anDict = [unarchiver decodeObjectForKey:@"aDict"];

  [unarchiver finishDecoding];

  NSLog(@"anInt=%@,anString=%@,anDict=%@",@(anInt),anString,anDict);

  //3.自定义对象归档实现copy协议

  #import

  @interface ArchiveCopy : NSObject

  @property (copy,nonatomic) NSString *name;

  @property (copy,nonatomic) NSString *anAge;

  end

- (void)encodeWithCoder:(NSCoder *)aCoder{

  [aCoder encodeObject:@"name"];

  [aCoder encodeObject:@"anAge"];

}

- (id)initWithCoder:(NSCoder *)aDecoder {

  if (self = [super init]) {

    _name = [aDecoder decodeObjectForKey:@"name"];

    _anAge = [aDecoder decodeIntegerForKey:@"anAge"];

  }

  return self;

}

#pragma mark - NSCoping

- (id)copyWithZone:(NSZone *)zone {

  ArchiveCopy *copy = [[[self class] allocWithZone:zone] init];

  copy.name = [self.name copyWithZone:zone];

  copy.anAge = [self.address copyWithZone:zone];

  return copy;

}

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