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归档与反归档

2024-07-23 12:22:13   220人阅读

一.归档操作

   NSArray *array =@[@"归档",@"反归档",@"开始”];

    //1.创建归档对象   

    NSMutableData *data = http://www.mamicode.com/[NSMutableDatadata];   

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

    //2.归档   

   [archiver encodeObject:perforKey:@"array"];    

    //3.结束归档,当结束归档之后,再归档无效   

    [archiver finishEncoding];   

    [array release];   

    [archiver release];

   
    //4.获取写入文件路径,没有会自动创建一个
    NSString *documentPath =     
[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES)firstObject];
 NSString *newFiel = [documentPathstringByAppendingPathComponent:@"bb.txt"];
   

    //5.data写入文件   

     BOOL isSucceed = [datawriteToFile:[selfgetFiel]atomically:YES];

 

二.反归档操作

   //1.根据文件路径初始化NSMutableData   

     NSMutableData *Data = http://www.mamicode.com/[NSMutableDatadataWithContentsOfFile:/Users/lanouhn/Library/Application Support/iPhone Simulator/7.1/Applications/300BEFD5-1F93-47A3-A1B3-936195FAA53F];

    //2.创建一个反归档类

    NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiveralloc]initForReadingWithData:Data];    

    //3.反归档   

    NSArray *array  = [unarchiverdecodeObjectForKey:@"array"];

    

    //4.结束反归档   

    [unarchiver finishDecoding];   

    [unarchiver release];


三 .注意

1.如果要对一个类的对象实现归档操作,必须让该类实现NSCoding协议

2.当对象为字符串,数组,字典,集合时,属性的语义特性声明为copy.

3.定义完属性的在给实例变量赋值时,要使用setter方法.

如下例
@interface Person : NSObject<NSCoding]]>
@property (nonatomic , copy)NSString *name 

归档与反归档


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