归档小结，归档时iOS 数据存储方式之一，可以用来存储自定义数据模型。

归档有两个主要的API：

第一种：NSKeyedArchiver的实例方法

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的类方法

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NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *path = [docPath stringByAppendingPathComponent:@"address.plist"];
[NSKeyedArchiver archiveRootObject:model toFile:path];