Objective c NSSortDescriptor未正确排序整数
我正在尝试按日期排序,然后按开始时间排序。开始时间是午夜后几分钟。因此,如果开始时间<100,它将无法正确排序Objective c NSSortDescriptor未正确排序整数,objective-c,ios5,nssortdescriptor,nsfetchedresultscontroller,Objective C,Ios5,Nssortdescriptor,Nsfetchedresultscontroller,我正在尝试按日期排序,然后按开始时间排序。开始时间是午夜后几分钟。因此,如果开始时间
- (NSFetchedResultsController *)fetchedResultsController {
if (fetchedResultsController != nil) {
return fetchedResultsController;
}
/*
Set up the fetched results controller.
*/
// Create the fetch request for the entity.
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
// Edit the entity name as appropriate.
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Appointments" inManagedObjectContext:[[DataManager sharedInstance] managedObjectContext]];
[fetchRequest setEntity:entity];
[fetchRequest setIncludesPendingChanges:YES];
// Set the batch size to a suitable number.
//[fetchRequest setFetchBatchSize:20];
// Sort using the date / then time property.
NSSortDescriptor *sortDescriptorDate = [[NSSortDescriptor alloc] initWithKey:@"date" ascending:YES];
NSSortDescriptor *sortDescriptorTime = [[NSSortDescriptor alloc] initWithKey:@"start_time" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptorDate, sortDescriptorTime, nil];
[fetchRequest setSortDescriptors:sortDescriptors];
// Use the sectionIdentifier property to group into sections.
NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:[[DataManager sharedInstance] managedObjectContext] sectionNameKeyPath:@"date" cacheName:@"List"];
aFetchedResultsController.delegate = self;
self.fetchedResultsController = aFetchedResultsController;
NSLog(@"FetchedController: %@", fetchedResultsController);
return fetchedResultsController;
}
如何正确地将此排序整数?如果开始时间是一个字符串,则它将按字母顺序排序,这意味着
aa
在b
之前,这也意味着11
在2
之前
要以更人性化的方式进行排序,请使用NSString
的本地化标准比较:
作为选择器
[NSSortDescriptor sortDescriptorWithKey:@"start_time" ascending:YES selector:@selector(localizedStandardCompare:)]
我希望您的开始时间(在您的核心数据对象模型中)是一个NSNumber对象,而不是字符串。就是这样!谢谢我把它作为字符串放在我的核心数据中,因为它是作为字符串而不是数字从API中输入的。正是我想要的。我有一个问题,我的字符串列是这样排序的1,10,11,2,3,4。。。上述解决方案解决了此问题。NSSortDescriptor*描述符=[NSSortDescriptor SortDescriptor With Key:@“DateTimeInSet”升序:是选择器:@selector(localizedStandardCompare:)];我的应用程序崩溃了。开始时间是类型NSString属性还是NSNumber?错误为-[\uu NSCFNumber localizedStandardCompare:]:无法识别的选择器发送到实例0x16dc40c0,用户信息为空)