写一个自定义对象数组

  • Z时代
  • 2024-01-10
  • 分类：问答

我在我的代码中有一组自定义对象。写一个自定义对象数组

我想将此数组写入文档文件夹中的文件。在这个答案iPhone - archiving array of custom objects我看到了，我需要实现这个方法：

- (void)encodeWithCoder:(NSCoder *)aCoder; 
- (id)initWithCoder:(NSCoder *)aDecoder;

所以我实现了他们：

- (void)encodeWithCoder:(NSCoder *)encoder { 
    [encoder encodeObject:self.data forKey:@"data"]; 
    [encoder encodeObject:self.nome forKey:@"nome"]; 
    [encoder encodeObject:self.celular forKey:@"celular"]; 
    [encoder encodeObject:self.endereco forKey:@"endereco"]; 
    [encoder encodeObject:self.horaConclusao forKey:@"horaConclusao"]; 
    [encoder encodeObject:self.horaAtendimento forKey:@"horaAtendimento"]; 
} 
- (id)initWithCoder:(NSCoder *)decoder { 
    self = [super init]; 
    if (self) { 
    self.data = [decoder decodeObjectForKey:@"data"]; 
    self.nome = [decoder decodeObjectForKey:@"nome"]; 
    self.celular = [decoder decodeObjectForKey:@"celular"]; 
    self.endereco = [decoder decodeObjectForKey:@"endereco"]; 
    self.horaConclusao = [decoder decodeObjectForKey:@"horaConclusao"]; 
    self.horaAtendimento = [decoder decodeObjectForKey:@"horaAtendimento"]; 
    } 
    return self; 
}

，并在我的代码我写使用这种方法：

这段代码删除旧文件

-(NSString *) plistHistoryFile { 
    NSError *error; 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 
    NSString *path = [documentsDirectory stringByAppendingPathComponent:[nameFile stringByAppendingPathExtension:@"plist"]]; 
    NSFileManager *filemgr = [NSFileManager defaultManager]; 
    if ([filemgr fileExistsAtPath:path]) { 
    [filemgr removeItemAtPath:path error:&error]; 
    } 
    return path; 
}

我在这个方法中调用写入：

-(void) writeArrayToHistoryFile:(NSArray *) array { 
    NSString *path = [self plistHistoryFile]; 
    NSLog(@"%@", path); 
    if ([array writeToFile:path atomically:NO]) { 
    NSLog(@"YES"); 
    } else { 
    NSLog(@"NO"); 
    } 
}

但我对日志的回应总是NO，我做错了什么？

回答：

你需要找出错误是什么，但是你不能使用-[NSArray writeToFile:atomically:]得到错误。相反，这样写文件：

NSError *error; 
NSData *data = [NSPropertyListSerialization dataWithPropertyList:array 
    format: NSPropertyListBinaryFormat_v1_0 options:0 error:&error]; 
if (!data) { 
    NSLog(@"failed to convert array to data: %@", error); 
    return; 
} 
if (![data writeToFile:path options:NSDataWritingAtomic error:&error]) { 
    NSLog(@"failed to write data to file: %@", error); 
    return; 
} 
NSLog(@"wrote data successfully");

以上是 写一个自定义对象数组 的全部内容， 来源链接： utcz.com/qa/257196.html

回到顶部