Question

我有一个表视图，其中包含用户可以更新的不同信息。其中一个是＆＃34;试点信息＆＃34;。当用户点击此行时，他们将转到另一个视图控制器，在那里他们填写有关飞行员的信息。（姓名电话号码等）然后，他们可以点击保存或取消两者，将它们返回到上一个表视图控制器。我想要做的是让用户能够再次点击导频信息，并查看他们刚输入的数据并在他们选择时进行编辑。我的解决方案是添加另一个segue并使用以下代码为其提供唯一标识符。（pilot是我核心数据模型中实体的名称，updatepilot是我给segue的名字。）

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"UpdatePilot"]) {
        NSManagedObject *selectedPilot = [self.pilots objectAtIndex:[[self.tableView indexPathForSelectedRow] row]];
        PilotViewController *destViewController = segue.destinationViewController;
        destViewController.pilot = selectedPilot;
    }
}

！http://tinypic.com/r/2ihbera/8

但是，我得到了未声明标识符＆＃39; destviewcontroller＆＃34;的错误使用。你的意思是UIViewController？我有没有看到这里的东西？任何帮助将不胜感激！

#import "PilotViewController.h"

@interface PilotViewController ()

@end

@implementation PilotViewController
- (NSManagedObjectContext *)managedObjectContext {
    NSManagedObjectContext *context = nil;
    id delegate = [[UIApplication sharedApplication] delegate];
    if ([delegate performSelector:@selector(managedObjectContext)]) {
        context = [delegate managedObjectContext];
    }
    return context;
}

@synthesize pilot;


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {

        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    if (self.pilot) {
        [self.nameField setText:[self.pilot valueForKey:@"pilotName"]];
        [self.emailField setText:[self.pilot valueForKey:@"pilotEmail"]];
        [self.phoneField setText:[self.pilot valueForKey:@"pilotPhone"]];
        [self.insuranceField setText:[self.pilot valueForKey:@"pilotInsurance"]];



    }
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

//Code created for cancel and save buttons
- (IBAction)cancel:(id)sender {
    [self dismissViewControllerAnimated:YES completion:nil];
}

- (IBAction)save:(id)sender {

    NSManagedObjectContext *context = [self managedObjectContext];

    if (self.pilot) {
        // Update existing Pilot
        [self.pilot setValue:self.nameField.text forKey:@"pilotName"];
        [self.pilot setValue:self.phoneField.text forKey:@"pilotPhone"];
        [self.pilot setValue:self.insuranceField.text forKey:@"pilotInsurance"];
        [self.pilot setValue:self.emailField.text forKey:@"pilotEmail"];

    } else {
        // Create a new pilot
        NSManagedObject *newPilot = [NSEntityDescription insertNewObjectForEntityForName:@"Pilot" inManagedObjectContext:context];
        [newPilot setValue:self.nameField.text forKey:@"pilotName"];
        [newPilot setValue:self.phoneField.text forKey:@"pilotPhone"];
        [newPilot setValue:self.insuranceField.text forKey:@"pilotInsurance"];
         [newPilot setValue:self.emailField.text forKey:@"pilotEmail"];
    }

    NSError *error = nil;
    // Save the object to persistent store
    if (![context save:&error]) {
        NSLog(@"Can't Save! %@ %@", error, [error localizedDescription]);
    }

    [self dismissViewControllerAnimated:YES completion:nil];
}
@end

Answer 1

尝试将segue.destinationViewController（类型id）强制转换为PilotViewController。

PilotViewController *destViewController = (PilotViewController *)segue.destinationViewController;

在Xcode的早期版本中，我相信我认为这是一个警告;您的构建设置可能设置为将所有警告视为错误。

表视图控制器的多个Segue

1 个答案: