归档自定义对象用到的编码解码

上文归档中没有提到的对自定义的对象归档，当我们对自定义的对象进行归档时会报错，因为程序对自定义的对象归档不知道该怎么编码解码，所以我们可以通过实现NSCoding协议的相关方法来告诉程序如何编码解码我们自定义类的对象，

代码：

自定义类遵守NSCoding协议，并且实现一下两个方法

#pragma mark---NSCoding

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

    [aCoder encodeObject:self.nameforKey:@"PersonName"];

//    [aCoder encodeObject:self.age forKey:@"personAge"];

    [aCoder encodeInt:self.ageforKey:@"personAge"];

    

}

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

    self.name = [aDecoderdecodeObjectForKey:@"PersonName"];

    self.age = [aDecoderdecodeIntForKey:@"personAge"];

    

    returnself;

    

}

这样我们就可以对自定义类的对象进行归档操作了，

    person *per = [[personalloc] init];

    per.name =@"zhangsan";

    per.age =12;

    

    person *new = [percopy];

    new.name =@"lisi";

    new.age =13;

    NSMutableArray *arry1 = [NSMutableArrayarrayWithObjects:per,new,nil];

    NSString *filePath =@"";

    NSString *arrPath = [filePathstringByAppendingPathComponent:@"arr.archiver"];

//归档

    [NSKeyedArchiverarchiveRootObject:arry1 toFile:arrPath];

//反归档

    NSArray *arrUnarch = [NSKeyedUnarchiverunarchiveObjectWithFile:arrPath];

    for (person *pin arrUnarch) {

        NSLog(@"%@",p.name);

    }

方法＋1

 NSMutableData *archiverData =[NSMutableData data];

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

    [archiver encodeObject:arry1 forKey:@"array1"];

    [archiver encodeObject:per forKey:@"person"];

    [archiver finishEncoding];

    [archiverData writeToFile:arrPath atomically:YES];

    

    NSMutableData *UnarchiverData = [NSMutableData dataWithContentsOfFile:arrPath];

    NSKeyedUnarchiver *Unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:UnarchiverData];

    NSArray *arr3 = [Unarchiver decodeObjectForKey:@"array1"];

    person *per3 = [Unarchiver decodeObjectForKey:@"person"];