iOS study Day15-自定义文件的解档和归档-优快云博客

本文介绍了一个Objective-C项目的归档与解档过程，通过实例演示了如何使用NSKeyedArchiver和NSKeyedUnarchiver来保存和读取自定义类的数据，并展示了如何实现NSCoding协议的方法来支持归档。

1. 归档

假设有两个类 Company 和CompanyBook

        //        建立三个Company对象
        Company* comp1 = [[Company alloc] initWithName:@"周大福" andId:1 andGongye:NO andXiao:NO andG:@"330121195501156625" andD:@"HZZDF"];
        Company* comp2 = [[Company alloc] initWithName:@"杭萧钢构" andId:2 andGongye:NO andXiao:NO andG:@"330121195501156626" andD:@"HXSS"];
        Company* comp3 = [[Company alloc] initWithName:@"浙大网新" andId:3 andGongye:NO andXiao:NO andG:@"330121195501156628" andD:@"INSIGMA"];
        //        加入CompanyBook类中
        CompanyBook* book1 = [[CompanyBook alloc] initWithName];
        [book1 addCompany:comp1];
        [book1 addCompany:comp2];
        [book1 addCompany:comp3];
        NSLog(@"%@",book1);

        //二、自定义类Companybook 的归档
        NSString* homepath = [NSSearchPathForDirectoriesInDomains(NSDesktopDirectory, NSUserDomainMask, YES) lastObject];
        NSString* path = [homepath stringByAppendingPathComponent:@"wjac.acv"];
        if([NSKeyedArchiver archiveRootObject:book1 toFile:path])
            NSLog(@"writing success!");

2 .解档

        //二、自定义类Companybook 的解档
        NSString* homepath = [NSSearchPathForDirectoriesInDomains(NSDesktopDirectory, NSUserDomainMask, YES) lastObject];
        NSString* path = [homepath stringByAppendingPathComponent:@"wjac.acv"];

        CompanyBook* book1 = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
        NSLog(@"comp1:%@",book1);

此时的CompanyBook的头文件应当是这样子

@interface CompanyBook : NSObject<NSCoding>

实现文件要有两个方法需要实现（假设该类有一个属性NSMutableArray * comArray）

- (void)encodeWithCoder:(NSCoder *)aCoder
{
    [aCoder encodeObject:comArray forKey:@"arraylist"];
    
}
- (id)initWithCoder:(NSCoder *)aDecoder
{
    if (self = [super init]) {
        comArray = [aDecoder decodeObjectForKey:@"arraylist"];
    }
    return self;
}