无法使用附件指标Segue公司 [英] Unable to segue using an accessory indicator
问题描述
我有三个转变（见下文code）一SEGUE。从按钮的第一个。这完美的作品。通过点击在表视图单元格中的第二个。一个完美的作品了。三是在实现代码如下细胞作为附件按钮。这一次开辟了正确的视图控制器，但不传递给患者的参考，因为我有codeD。我已经在新的视图控制器的viewDidLoad中的声明的NSLog验证了这个，它显示病人为被空。
- （无效）prepareForSegue：（UIStoryboardSegue *）赛格瑞发件人：（ID）发送{ 如果（[SEGUE符] isEqualToString：@addPatient]）{ //添加一个新的病人（选择SEGUE） UINavigationController的* navigationController = segue.destinationViewController; RXAddPatientViewController * addPatientViewController =（RXAddPatientViewController *）navigationController.topViewController; 患者* addPatient = [NSEntityDescription insertNewObjectForEntityForName：@病人inManagedObjectContext：自managedObjectContext]]; addPatientViewController.addPatient = addPatient;
} 如果（[SEGUE符] isEqualToString：@，以prescriptions]）{ //查看所选病人prescriptions（选择SEGUE） RX prescriptionsViewController * prescriptionViewController = [Segue公司destinationViewController] NSIndexPath * indexPath = [self.tableView indexPathForSelectedRow] 病人* selectedPatient =（病人*）[self.fetchedResultsController objectAtIndexPath：indexPath]; prescriptionViewController.selectedPatient = selectedPatient; 的NSLog（@选定的患者是％@，selectedPatient.patientFirstName）; } 如果（[SEGUE符] isEqualToString：@editPatient]）{ //编辑选定的患者（附件动作） UINavigationController的* navigationController = segue.destinationViewController; RXEditPatientViewController * editPatientViewController =（RXEditPatientViewController *）navigationController.topViewController; NSIndexPath * indexPath = [self.tableView indexPathForSelectedRow] 病人* editPatient =（病人*）[self.fetchedResultsController objectAtIndexPath：indexPath]; //传递一个参考editPatientViewController
editPatientViewController.editPatient = editPatient; 的NSLog（@选定病人％@，editPatient.patientFirstName）;
}
}
该indexPathForSelectedRow将是空的，当你在附件按钮点击，因为你不选择行。然而，在prepareForSegue发件人的说法：发件人：将是附件按钮包含在细胞所以，你应该用下面的方法来获取indexPath（请注意，我是从改变参数的打字的UITableViewCell。 ID）：
- （无效）prepareForSegue：（UIStoryboardSegue *）赛格瑞发件人：（*的UITableViewCell）发送{ 如果（[SEGUE符] isEqualToString：@editPatient]）{ //编辑选定的患者（附件动作） UINavigationController的* navigationController = segue.destinationViewController; RXEditPatientViewController * editPatientViewController =（RXEditPatientViewController *）navigationController.topViewController; NSIndexPath * indexPath = [self.tableView indexPathForCell：寄件人]; 病人* editPatient =（病人*）[self.fetchedResultsController objectAtIndexPath：indexPath]; //传递一个参考editPatientViewController
editPatientViewController.editPatient = editPatient; 的NSLog（@选定病人％@，editPatient.patientFirstName）;
}
I have a segue with three transitions (see code below). The first from a button. That works perfectly. The second by tapping on the cell in a table view. That one works perfectly too. The third is an accessory button in the tableview cell. This one opens the proper view controller, but does not pass a reference to the patient as I have coded. I have verified this by an NSLog statement in the viewDidLoad of the new view controller and it shows patient as being null.
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([[segue identifier] isEqualToString:@"addPatient"]) {
// to add a new patient (selection segue)
UINavigationController *navigationController = segue.destinationViewController;
RXAddPatientViewController *addPatientViewController = (RXAddPatientViewController*)navigationController.topViewController;
Patient *addPatient = [NSEntityDescription insertNewObjectForEntityForName:@"Patient" inManagedObjectContext:[self managedObjectContext]];
addPatientViewController.addPatient = addPatient;
}
if ([[segue identifier] isEqualToString:@"toPrescriptions"]) {
// to view prescriptions for the selected patient (selection segue)
RXPrescriptionsViewController *prescriptionViewController = [segue destinationViewController];
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
Patient *selectedPatient = (Patient*) [self.fetchedResultsController objectAtIndexPath:indexPath];
prescriptionViewController.selectedPatient = selectedPatient;
NSLog(@"Selected Patient is %@", selectedPatient.patientFirstName);
}
if ([[segue identifier] isEqualToString:@"editPatient"]) {
// to edit the selected patient (accessory action)
UINavigationController *navigationController = segue.destinationViewController;
RXEditPatientViewController *editPatientViewController = (RXEditPatientViewController*)navigationController.topViewController;
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
Patient *editPatient = (Patient*) [self.fetchedResultsController objectAtIndexPath:indexPath];
// passing a reference to the editPatientViewController
editPatientViewController.editPatient = editPatient;
NSLog(@"Selected patient is %@", editPatient.patientFirstName);
}
}
The indexPathForSelectedRow will be null when you click on the accessory button because you're not selecting the row. However, the sender argument in prepareForSegue:sender: will be the cell that the accessory button is contained in. So, you should use the following method to get the indexPath (notice that I changed the typing of the argument to UITableViewCell from id):
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(UITableViewCell *)sender {
if ([[segue identifier] isEqualToString:@"editPatient"]) {
// to edit the selected patient (accessory action)
UINavigationController *navigationController = segue.destinationViewController;
RXEditPatientViewController *editPatientViewController = (RXEditPatientViewController*)navigationController.topViewController;
NSIndexPath *indexPath = [self.tableView indexPathForCell:sender];
Patient *editPatient = (Patient*) [self.fetchedResultsController objectAtIndexPath:indexPath];
// passing a reference to the editPatientViewController
editPatientViewController.editPatient = editPatient;
NSLog(@"Selected patient is %@", editPatient.patientFirstName);
}
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