iOS study Day15-自定义文件的解档和归档

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;
}