归档/反归档

一.归档操作

NSArray*array =@[@"归档",@"反归档",@"开始”]

;

//1.创建归档对象   

NSMutableData*data = [NSMutableDatadata];   

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

//2.归档   

[archiverencodeObject:perforKey:@"array"];    

//3.结束归档,当结束归档之后,再归档无效   

[archiverfinishEncoding];   

[array release];   

[archiverrelease];

//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   

BOOLisSucceed = [datawriteToFile:[selfgetFiel]atomically:YES];

二.反归档操作

//1.根据文件路径初始化NSMutableData   

NSMutableData*Data = [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   

[unarchiverfinishDecoding];   

[unarchiverrelease];

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