IOS归档操作

使用NSKeyedArchiver归档

　　　　  NSDictionary *writedic = @{@"key1":@"value1",@"key2":@"value2",@"key3":@"value3"};
        [NSKeyedArchiver archiveRootObject:writedic toFile:@"mydic.archive"];
        
        NSDictionary *readdic = [NSKeyedUnarchiver unarchiveObjectWithFile:@"mydic.archive"];
        NSLog(@"%@",readdic);

使用NSCoding对自定义对象归档

1类定义

@interface Zltobject : NSObject<NSCoding> {
    NSString *_name;
    int _age;
    float _weight;
    
}

- (void)encodeWithCoder:(NSCoder *)aCoder {
    [aCoder encodeObject:_name forKey:@"name"];
    [aCoder encodeInt:_age forKey:@"age"];
    [aCoder encodeFloat:_weight forKey:@"weight"];
    
}


- (id)initWithCoder:(NSCoder *)aDecoder {
    _name = [aDecoder decodeObjectForKey:@"name"];
    _age = [aDecoder decodeIntForKey:@"age"];
    _weight = [aDecoder decodeFloatForKey:@"weight"];
    
    return self;
}

2归档

　　　　　Zltobject *obj = [[Zltobject alloc] initWithName:@"zlt" Age:18 Weight:120.5];
        [NSKeyedArchiver archiveRootObject:obj toFile:@"obj.archive"];
        Zltobject *obj2 = [NSKeyedUnarchiver unarchiveObjectWithFile:@"obj.archive"];
        NSLog(@"%@",obj2);

如果类中的成员变量有其他的自定义类，也需要实现NSCoding协议

 使用NSData归档多个对象

　　　　　NSDictionary *archive1 = @{@"key1":@"value1"};
        Zltobject *archive2 = [[Zltobject alloc] initWithName:@"zlt" Age:18 Weight:120.5];
        NSMutableData *writeData = [NSMutableData data];
        NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:writeData];
        [archiver encodeObject:archive1 forKey:@"archive1"];
        [archiver encodeObject:archive2 forKey:@"archive2"];
        //结束归档
        [archiver finishEncoding];
        //写入文件
        [writeData writeToFile:@"mutable.archive" atomically:YES];
        
        NSData *readData = [NSData dataWithContentsOfFile:@"mutable.archive"];
        NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:readData];
        NSDictionary *dic = [unarchiver decodeObjectForKey:@"archive1"];
        Zltobject *zltobj = [unarchiver decodeObjectForKey:@"archive2"];
        //结束恢复
        [unarchiver finishDecoding];
        NSLog(@"%@,%@",dic,zltobj);