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iOS runtime归档

iOS runtime归档

作者: 木_穆 | 来源:发表于2019-01-20 19:06 被阅读0次
    - (void)encodeWithCoder:(NSCoder *)coder{
        //告诉系统归档的属性是哪些
        unsigned int count = 0;//表示对象的属性个数
        Ivar *ivars = class_copyIvarList([UserDataModel class], &count);
        for (int i = 0; i<count; i++) {
            //拿到Ivar
            Ivar ivar = ivars[i];
            const char *name = ivar_getName(ivar);//获取到属性的C字符串名称
            NSString *key = [NSString stringWithUTF8String:name];//转成对应的OC名称
            //归档 -- 利用KVC
            [coder encodeObject:[self valueForKey:key] forKey:key];
        }
        free(ivars);//在OC中使用了Copy、Creat、New类型的函数,需要释放指针!!(注:ARC管不了C函数)
    }
    
    - (instancetype)initWithCoder:(NSCoder *)coder{
        self = [super init];
        if (self) {
            //解档
            unsigned int count = 0;
            Ivar *ivars = class_copyIvarList([UserDataModel class], &count);
            for (int i = 0; i<count; i++) {
                //拿到Ivar
                Ivar ivar = ivars[i];
                const char *name = ivar_getName(ivar);
                NSString *key = [NSString stringWithUTF8String:name];
                //解档
                id value = [coder decodeObjectForKey:key];
                // 利用KVC赋值
                [self setValue:value forKey:key];
            }
            free(ivars);
        }
        return self;
    }
    - (IBAction)save:(UIButton *)sender {
        UserDataModel *person = [[UserDataModel alloc] init];
        //这里以temp路径为例,存到temp路径下
        NSString *temp = NSTemporaryDirectory();
        NSString *filePath = [temp stringByAppendingPathComponent:@"obj.data"]; //注:保存文件的扩展名可以任意取,不影响。
        NSLog(@"%@", filePath);
        //归档
        [NSKeyedArchiver archiveRootObject:person toFile:filePath];
    }
    
    - (IBAction)read:(UIButton *)sender {
        //取出归档的文件再解档
        NSString *filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"obj.data"];
        //解档
        UserDataModel *person = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
    }
    海到尽头天为岸
    链接:https://www.jianshu.com/p/3e08fa21316d
    
    
    

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