iOS数据持久化之归档

签协议

   <NSCoding>

现在model 中 实现 

model中有两个属性

-(void)encodeWithCoder:(NSCoder*)aCoder

{
    [aCoder encodeObject:self.name forKey:@"name"];
    [aCoder encodeInteger:self.age forKey:@"age"];
   
}

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

}

 //归档

 BOOL result =   [NSKeyedArchiver archiveRootObject:stu toFile:pathStr];

   

   

  //反归档

   Student *stu1 = [NSKeyedUnarchiver  unarchiveObjectWithFile:pathStr];