iOS归档 反归档 Archiving Unarchiver

Archiving: 归档

支持的类型：只要遵守NSCoding协议的对象都可以使用归档

归档步骤(写)

a. 准备可变数据对象NSMutableData

NSMutableData *mutableData = [NSMutableData data];

b. 创建归档对象NSKeyedArchiver

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

c. 针对要保存的对象进行编码encode

[archiver encodeObject:dataArray forKey:@”user”];

执行归档动作!!!![archiver finishEncoding];

d. 将数据写到文件中

[mutableData writeToFile:self.archivingFilePath atomically:YES];

反归档步骤(读)

a. 准备可变数据对象NSMutableData

NSData *data = [NSData dataWithContentsOfFile:self.archivingFilePath];

b. 创建反归档对象NSKeyedUnarchiver

NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];

c. 针对要读取的对象进行解码

NSArray *array = [unarchiver decodeObjectForKey:@”user”];

d. 执行反归档的动作

[unarchiver finishDecoding];