我正在开发一个保存医疗记录的应用程序。我正在使用具有单个上下文和单个物理存储的核心数据。尽管调用了 [managedObjectContext save:&error]，但如果我通过 Xcode 提取容器，sqlite db 不会显示最新数据。
尝试了类似此处建议的方法：Core data not save my data，但对我没有用。更糟糕的是，数据确实会在一段时间后出现：应用程序可以通过 FTP 发送 sqlite 以转储数据以进行灾难恢复。碰巧上周的工作并不总是出现，但通常会在一周后出现。
我不明白的是：[managedObjectContext save:&error] 是否立即在实体店中写入数据？（我的猜测是否定的）我如何告诉核心数据我想当场写下我的数据（假设它实际上是可能的）？关闭应用程序和/或重新启动设备是否会使核心数据写入 sqlite？
编辑 1 - 添加一些代码 [managedObjectContext save:&error] 在 [CommonHelper SaveData:true] 中被调用；就在@try 块的开头。
_FollowUp.bMI=[NSNumber numberWithFloat: [TextBMI.text floatValue]];
_FollowUp.karfnosky=[NSNumber numberWithInt: [TextKarfnosky.text intValue]];
_FollowUp.charlson=[NSNumber numberWithInt: [TextCharlson.text intValue]];
_FollowUp.alimentazione=ButtonAlimentazione.titleLabel.text;
_FollowUp.farmaci=TextFarmaci.text;
_FollowUp.dolore=ButtonDolore.titleLabel.text;
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
@try {
[CommonHelper SaveData:true];
UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@“Data saved” message: @“Record saved successfully” delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
[alert show];
float height = self.view.bounds.size.height;
float width = self.view.bounds.size.width;
lblSincro = [[UILabel alloc]initWithFrame:CGRectMake(width/2-200 ,height/2+30, 400, 20)];
lblSincro.autoresizingMask = UIViewAutoresizingFlexibleWidth;
lblSincro.font = [UIFont boldSystemFontOfSize:16.0f];
lblSincro.numberOfLines = 1;
[lblSincro setTextAlignment:NSTextAlignmentCenter];
lblSincro.backgroundColor = [UIColor clearColor];
lblSincro.textColor = [UIColor whiteColor];
lblSincro.text = @"Uploading in progress";
UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge] ;
spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge] ;
spinner.frame = CGRectMake(0, 0, width,height);
spinner.tag = 3;
UIColor *color = [[UIColor alloc] initWithRed:0.0 green:0.0 blue:0.0 alpha:0.5];
spinner.backgroundColor =color;
lblSincroDet = [[UILabel alloc]initWithFrame:CGRectMake(width/2-200 ,height/2+70, 400, 20)];
lblSincroDet.autoresizingMask = UIViewAutoresizingFlexibleWidth;
lblSincroDet.font = [UIFont boldSystemFontOfSize:16.0f];
lblSincroDet.numberOfLines = 1;
[lblSincroDet setTextAlignment:NSTextAlignmentCenter];
lblSincroDet.backgroundColor = [UIColor clearColor];
lblSincroDet.textColor = [UIColor whiteColor];
[self.view addSubview:lblSincro];
[self.view addSubview:lblSincroDet];
[self.view addSubview:spinner];
[spinner addSubview:lblSincro];
[spinner addSubview:lblSincroDet];
[spinner startAnimating];
dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void){
SyncHelper *sync=[SyncHelper alloc];
BOOL result=sync.Sincronize;
dispatch_async(dispatch_get_main_queue(), ^(void){
[spinner stopAnimating];
[lblSincro removeFromSuperview];
[lblSincroDet removeFromSuperview];
[lblSincro removeFromSuperview];
if(result){
_SaveView = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"successSincro", @"") message:NSLocalizedString(@"successSincroMessage", @"") delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
[_SaveView show];
}else{
_SaveView = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"failedSincro", @"") message:NSLocalizedString(@"failedSincroMessage", @"")
delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
[_SaveView show];
}
});
});
_FollowUpLoad=_FollowUp;
_isNew=false;
}@catch (NSException *ex)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message: @“Failed to save data” delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
[alert show];
}