利用Runtime快速归档

/*
平时用coder归档类的变量的时候，需要把每个变量都设置一个key（这个key可能还需要拼一些东西，具体未测试），这里利用runtime获取变量名加kvc赋值实现归档
需要引入#import 
*/

//coder初始化
- (id)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super init]) {
        unsigned int outCount;//变量数
        Ivar * ivars = class_copyIvarList([self class], &outCount);//获取变量列表ivars是一个Ivar数组
        for (int i = 0; i < outCount; i ++) {
            Ivar ivar = ivars[i];//取出第i个Ivar
            NSString * key = [NSString stringWithUTF8String:ivar_getName(ivar)];//根据Ivar得到变量名字的字符串
            [self setValue:[aDecoder decodeObjectForKey:key] forKey:key];//利用kvc给变量设置值
        }
    }
    return self;
}

//coder打包
- (void)encodeWithCoder:(NSCoder *)aCoder {
    unsigned int outCount;//变量数
    Ivar * ivars = class_copyIvarList([self class], &outCount);//获取变量列表ivars是一个Ivar数组
    for (int i = 0; i < outCount; i ++) {
        Ivar ivar = ivars[i];//取出第i个Ivar
        NSString * key = [NSString stringWithUTF8String:ivar_getName(ivar)];//根据Ivar得到变量名字的字符串
        [aCoder encodeObject:[self valueForKey:key] forKey:key];//利用kvc取出变量的值
    }
}

//归档自己
- (void)archiveMySelf {
    NSString * archiveKey = [[NSString stringWithUTF8String:object_getClassName(self)] stringByAppendingString:@"_archiveKey"];
    NSData * data = [NSKeyedArchiver archivedDataWithRootObject:self];
    [[NSUserDefaults standardUserDefaults] setObject:data forKey:archiveKey];
}

//解归档自己
+ (instancetype)unarchiveMySelf {
    NSString * archiveKey = [[NSString stringWithUTF8String:object_getClassName(self)] stringByAppendingString:@"_archiveKey"];
    NSData * data = [[NSUserDefaults standardUserDefaults] objectForKey:archiveKey];
    return [NSKeyedUnarchiver unarchiveObjectWithData:data];
}