数据存储之归档

归档有两种方法:

第一种:一个对象创建一个归档文件,缺点:太麻烦

比如,归档一个数组

    NSArray *array = @[@"123" , @"abc" , @"132"];
    // 拿到创建用户的根路径
    NSString *homePath = NSHomeDirectory();
    NSLog(@"%@" , homePath);
    NSString *path = [homePath stringByAppendingPathComponent:@"text.yaalv"];
    BOOL success = [NSKeyedArchiver archiveRootObject:array toFile:path];
    if (success) {
        NSLog(@"归档成功");
    }

解归档的方法

    NSString *homePath = NSHomeDirectory();
    NSLog(@"%@" , homePath);
    NSString *path = [homePath stringByAppendingPathComponent:@"text.yaalv"];
    NSArray *data = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
    NSLog(@"%@" , data[0]);

第二种就是建一个归档文件,将要保存的内容归档

    NSString *homePath = NSHomeDirectory();
    NSLog(@"%@" , homePath);
    NSString *filePath = [homePath stringByAppendingPathComponent:@"custom.text"];
    NSMutableData *data = [NSMutableData data];
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
    [archiver encodeFloat:50.0 forKey:@"weight"];
    // @"李四"这里可以填任很多的数据的数据类型,比如数组什么的
    [archiver encodeObject:@"李四" forKey:@"name"];
    [archiver encodeInt:12 forKey:@"age"];
    [archiver finishEncoding];
    
    BOOL success = [data writeToFile:filePath atomically:YES];
    if (success) {
        NSLog(@"------归档成功");
    }

解归档的方法

    NSString *homePath = NSHomeDirectory();
    NSLog(@"%@" , homePath);
    NSString *filePath = [homePath stringByAppendingPathComponent:@"custom.text"];
    NSData *data = [NSData dataWithContentsOfFile:filePath];
    NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
    NSString *name = [unarchiver decodeObjectForKey:@"name"];
    NSLog(@"name:%@" , name);

本文demo下载:
https://github.com/TheifSeaMew/-.git