iOS 归档解档以及删除

最近公司需求中新添加类似于微信朋友圈,保存草稿功能,不多BB,上代码:

// 写入 

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString*documentFilePath = paths.firstObject  ;

//路径名称

  NSString *filePath = [documentFilePath stringByAppendingPathComponent:@"XXX"];

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

    NSKeyedArchiver*archiver =  [[NSKeyedArchiver alloc] initForWritingWithMutableData:data]; //将数据区连接到NSKeyedArchiver对象

//需要存储的key and value

 [archiver encodeObject:aTextString forKey:@"xxxx"];

    [archiver encodeObject:infoArr forKey:@"xxxxx"];

    [archiver finishEncoding];

//写入

    [data writeToFile:filePathatomically:YES];

//取出

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString*documentFilePath = paths.firstObject  ;

    NSString *filePath = [documentFilePath stringByAppendingPathComponent:@"xxxx"];

    NSData *data = [NSData dataWithContentsOfFile:filePath];

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

   NSAttributedString*textStr =  [unarchiver decodeObjectForKey:@"xxxx"];

    self.aTextString= textStr;

    self.textString= (NSMutableString*)textStr;

    self.infoArray=  [unarchiver decodeObjectForKey:@"xxxx"];

    self.infoArrayCopy=  [unarchiver decodeObjectForKey:@"xxxx"];

    [unarchiver finishDecoding];

    //置空

    NSMutableArray *array = [NSMutableArray array];

    NSAttributedString *aTextStr = [[NSAttributedString alloc]initWithString:@""];

//重新走一遍归档

xxxxxxx

//用户退出时删除

    NSFileManager *defaultManager = [NSFileManager defaultManager];

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString*documentFilePath = paths.firstObject  ;

//找到路径

    NSString *filePath = [documentFilePath stringByAppendingPathComponent:@"xxxx"];

//判断是否包含 有直接删除

    if([defaultManager isDeletableFileAtPath:filePath]) {

        [defaultManager removeItemAtPath:filePath error:nil];

    }