歸檔小結，歸檔時iOS 數據存儲方式之一，能夠用來存儲自定義數據模型。

歸檔有兩個主要的API：

第一種：NSKeyedArchiver的實例方法

NSMutableData *data = [[NSMutableData alloc] init];

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

    [archiver encodeObject:student forKey:kData];

    [archiver finishEncoding];

    [data writeToFile:[self getFilePath] atomically:YES];

其二： NSKeyedArchiver的類方法

NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];

    NSString *path = [docPath stringByAppendingPathComponent:@"address.plist"];

    [NSKeyedArchiver archiveRootObject:model toFile:path];