iOS 对象的归档、解档 runtime

悠悠 2022-07-12 02:43 181阅读 0赞

若要实例对象实现归档解档，需要该类遵守NSCoding协议，及以下协议方法

项目中以YCArchiveBase类为例，可直接添加属性使用

# pragma mark - NSCoding #

*  (void)encodeWithCoder:(NSCoder \*)aCoder\{  
    unsigned int count = 0;  
    //取出所有属性  
    objc\_property\_t \*properties = class\_copyPropertyList(\[self class\], &count);  
    //遍历属性  
    for (int i = 0; i < count; i++) \{  
    //获取当前遍历的属性的名称  
    const char \*propertyName = property\_getName(properties\[i\]);  
    NSString \*name = \[NSString stringWithUTF8String:propertyName\];
    
        id value = [self valueForKey:name];
        [aCoder encodeObject:value forKey:name];
    
    \}  
    \}
 *  (instancetype)initWithCoder:(NSCoder \*)aDecoder\{
    
    unsigned int count =0;  
    //1.取出所有的属性  
    objc\_property\_t \*propertes = class\_copyPropertyList(\[self class\], &count);  
    //2.遍历所有的属性  
    for (int i = 0; i < count; i++) \{  
    //获取当前遍历到的属性名称  
    const char \*propertyName = property\_getName(propertes\[i\]);  
    NSString \*name = \[NSString stringWithUTF8String:propertyName\];  
    //解归档前遍历得到的属性的值  
    id value = \[aDecoder decodeObjectForKey:name\];  
    // self.className = \[decoder decodeObjectForKey:@”className”\];  
    \[self setValue:value forKey:name\];  
    \}  
    return self;  
    \}

归档和接档的操作以类方法实现如下（可自己创建管理类分离出去）：  
ArchiveFilePath 为文件存储路径  
\+ (void)archiveWithObjc:(id)objc\{

NSMutableData *data = [NSMutableData data];
    //归档
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc]initForWritingWithMutableData:data];
    
    [archiver encodeObject:objc forKey:@"archive"];
    [archiver finishEncoding];
    
    NSLog(@"data:%@",data);
    [data writeToFile:ArchiveFilePath atomically:YES];

*  (id)unarchive\{  
    //解档  
    NSData \*unData = \[NSData dataWithContentsOfFile:ArchiveFilePath\];  
    NSKeyedUnarchiver \*unarchiver = \[\[NSKeyedUnarchiver alloc\]initForReadingWithData:unData\];  
    YCArchiveBase \*unmodel = \[unarchiver decodeObjectForKey:@”archive”\];  
    return unmodel;  
    \}

使用：  
YCArchiveBase \*model = \[\[YCArchiveBase alloc\]init\];  
model.name = @”testname”;  
model.num = 23;  
model.address = @”address”;  
model.ddd = 23.0;

//归档
    [YCArchiveBase archiveWithObjc:model];
    
    //解档
    YCArchiveBase *unmodel = [YCArchiveBase unarchive];
    NSLog(@"archiver:%@",unmodel.name);

git: [https://github.com/yuchenArron/Archiver-Demo][https_github.com_yuchenArron_Archiver-Demo]  
到此结束

[https_github.com_yuchenArron_Archiver-Demo]: https://github.com/yuchenArron/Archiver-Demo