数据存储方式IOS---归档与解档

一：归档与解档

（1：：：：：：）归档

1：保存数据到模型类，如下：

- (instancetype)initWithDic:(NSDictionary*)dic

{

    self = [super init];

    if (self) {

        //

        

        //转模型

        for (NSString* key in [self getAllPropertys]) {

            //

            NSArray* tmparr = [key componentsSeparatedByString:@"p_"];

            NSString* tmpkey =tmparr.lastObject;

            

            id propertyValue = [dic valueForKey:tmpkey];

            [self setValue:[LSFactory fc_judgeObj:propertyValue placeholder:@""] forKey:key];

        }

        

        //

    }

    return self;

}

2：将该模型类归档

+(void)fc_setValueModel:(YHBaseModel *)model ForKey:(NSString *)key{

    NSMutableData * data = [[NSMutableData alloc]init];

    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc]initForWritingWithMutableData:data];

    [archiver encodeObject:model forKey:key];

    [archiver finishEncoding];

    [self fc_writeCecheFile:data withFileID:key];

}

3：将归档后的数据写进本地缓存

+(void)fc_writeCecheFile:(NSData *)data

           withFileID:(NSString *)fileID{

    NSString* path = [NSHomeDirectory() stringByAppendingString:kLS_BASE_CECHE_PATH_Archiver];

    NSFileManager * fileManager = [NSFileManager defaultManager];

    //判断目录是否存在

    if (![fileManager fileExistsAtPath:cechePath]) {

        //创建目录

        [fileManager createDirectoryAtPath:cechePath withIntermediateDirectories:YES attributes:nil error:nil];

    }

    //拼接文件路径

    NSMutableString * tempStr = [[NSMutableString alloc]init];

    for (int i=0; i<fileID.length; i++) {

        if (([fileID characterAtIndex:i]<='9'&&[fileID characterAtIndex:i]>='0')||([fileID characterAtIndex:i]<='z'&&[fileID characterAtIndex:i]>='a')||([fileID characterAtIndex:i]<='Z'&&[fileID characterAtIndex:i]>='A')) {

            [tempStr appendFormat:@"%c",[fileID characterAtIndex:i]];

        }

    }

    NSString * writePath = [cechePath stringByAppendingFormat:@"/%@",tempStr];

    [data writeToFile:writePath atomically:YES];

    //    NSLog(@"写缓存");

}

#pra mark -获取说有的成员变量

-(NSArray *)getAllPropertys{

    NSMutableArray * array = [[NSMutableArray alloc]init];

    

    unsigned int * count = malloc(sizeof(unsigned int));

    //调用runtime的方法

    //Ivar：方法返回的对象内容对象，这里将返回一个Ivar类型的指针

    //class_copyIvarList方法可以捕获到类的所有变量，将变量的数量存在一个unsigned int的指针中

    Ivar * mem = class_copyIvarList([self class], count);

    //进行遍历

    for (int i=0; i< *count ; i++) {

        //通过移动指针进行遍历

        Ivar var = * (mem+i);

        //获取变量的名称

        const char * name = ivar_getName(var);

        NSString * str = [NSString stringWithCString:name encoding:NSUTF8StringEncoding];

        [array addObject:str];

    }

    //释放内存

    free(count);

    //注意处理野指针

    count=nil;

    return array;

}

2：（接档）

1.根据路径先找data

+(NSData *)fc_readCecheFile:(NSString *)fileID fromPath:(NSString*)cechePath{

    NSMutableString * tempStr = [[NSMutableString alloc]init];

    for (int i=0; i<fileID.length; i++) {

        if (([fileID characterAtIndex:i]<='9'&&[fileID characterAtIndex:i]>='0')||([fileID characterAtIndex:i]<='z'&&[fileID characterAtIndex:i]>='a')||([fileID characterAtIndex:i]<='Z'&&[fileID characterAtIndex:i]>='A')) {

            [tempStr appendFormat:@"%c",[fileID characterAtIndex:i]];

        }

    }

    NSString * readPath = [cechePath stringByAppendingFormat:@"/%@",tempStr];

    NSFileManager * fileManager = [NSFileManager defaultManager];

    //判断文件是否

    if (![fileManager fileExistsAtPath:readPath]) {

        return nil;

    }else{

        NSData *data = [NSData dataWithContentsOfFile:readPath];

        return data;

    }

}

2.找到data 之后开始接档，创建数据模型类

+(YHBaseModel *)fc_getValueModel:(NSString *)key{

    NSString* path = [NSHomeDirectory() stringByAppendingString:kLS_BASE_CECHE_PATH_Archiver];

    NSData * data = [self fc_readCecheFile:key fromPath:path];

    NSKeyedUnarchiver * unArchiver = [[NSKeyedUnarchiver alloc]initForReadingWithData:data];

    YHBaseModel * model = [unArchiver decodeObjectForKey:key];

    [unArchiver finishDecoding];

    return model;

}