在顯示之前獲取_detailItem和更改標籤數據

Question

我一直在頭撞我的桌子一個小時。我需要獲取從一個視圖控制器傳遞到下一個視圖控制器的詳細信息，然後在顯示視圖之前更新視圖。對我而言，我無法正常工作。這裏是我使用的代碼：

VC＃1（通過從數據）：

-(IBAction)NotOwed:(id)sender{ 
     InputViewController *input = [[InputViewController alloc]init]; 
    self.tdModal = input; 
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main_iPhone" bundle:nil]; 
    InputViewController *viewController = (InputViewController *)[storyboard instantiateViewControllerWithIdentifier:@"VDI"]; 
    [self presentViewController:viewController animated:YES completion:nil]; 
    [self.tdModal setDetailItem:@"NotOwed"]; 


    // do any setup you need for myNewVC 
    [self dismissSemiModalViewController:self]; 


} 

-(IBAction)Owed:(id)sender{ 


    InputViewController *input = [[InputViewController alloc]init]; 
     [self.tdModal setDetailItem:@"Owed"]; 
    self.tdModal = input; 


    [input setDetailItem:@"Owed"]; 

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main_iPhone" bundle:nil]; 
    InputViewController *viewController = (InputViewController *)[storyboard instantiateViewControllerWithIdentifier:@"VDI"]; 
    [self presentViewController:viewController animated:YES completion:nil]; 
     // do any setup you need for myNewVC 
[self dismissSemiModalViewController:self]; 


} 

VC＃2（數據）：

- (void)setDetailItem:(id)newDetailItem 
{ 
    if (_detailItem != newDetailItem) { 
     _detailItem = newDetailItem; 

     NSLog(@"THIS: %@", _detailItem); 
     [self configureView]; 

     } 

} 
- (void)viewDidLoad 
{ 
    [oField addTarget:self action:@selector(textFieldChanged:) forControlEvents:UIControlEventEditingChanged]; 
    [iField addTarget:self action:@selector(textFieldChanged:) forControlEvents:UIControlEventEditingChanged]; 


    [super viewDidLoad]; 
    id delegate = [[UIApplication sharedApplication] delegate]; 
    self.managedObjectContext = [delegate managedObjectContext]; 
    UIView *fixItView = [[UIView alloc] init]; 
    fixItView.frame = CGRectMake(0, 0, 320, 20); 
    fixItView.backgroundColor = [UIColor blackColor]; //change this to match your navigation bar 
    [self.view addSubview:fixItView]; 

    // Do any additional setup after loading the view. 
    UIDatePicker *picker = [[UIDatePicker alloc] init]; 
    picker.datePickerMode = UIDatePickerModeDate; 
    dueField.inputView = picker; 
    [picker addTarget:self action:@selector(updateTextField:) forControlEvents:UIControlEventValueChanged]; 


} 
- (void)configureView 
{ 
    // Update the user interface for the detail item. 

    if (self.detailItem) { 
     if ([[_detailItem description] isEqual: @"Owed"]){ 

      iLabel.hidden = true; 
      oLabel.hidden = true; 
      mLabel.text = @"owes me the sum of"; 

     }else{ 
      iLabel.hidden = false; 
      oLabel.hidden = false; 

      mLabel.text = @"the sum of"; 
     } 
    } 
} 
- (IBAction)submit:(id)sender 
{ 

    UIDatePicker *picker = (UIDatePicker*)dueField.inputView; 


    NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; 



    NSString *editedMoney = [[NSString alloc]init]; 
    [formatter setDateFormat:@"ddMMyyyy"]; 
    [formatter setDateStyle:NSDateFormatterFullStyle]; 
    NSDate *dt = picker.date; 
    NSString *dateAsString = [formatter stringFromDate:dt]; 
    dateOwed = YES; 
    id delegate = [[MasterViewController alloc] init]; 
    self.managedObjectContext = [delegate managedObjectContext]; 
    if ([_detailItem isEqual: @"Owed"]) { 
    editedMoney = [NSString stringWithFormat:@"+$%@", oField.text]; 

    }else{ 
     editedMoney = [NSString stringWithFormat:@"-$%@", oField.text]; 

    } 
     MasterViewController *topViewController = [[MasterViewController alloc]init]; 
    topViewController.managedObjectContext = self.managedObjectContext; 
    NSString *wow = [[NSString alloc]init]; 
    if(oLabel.hidden == true){ 
     wow = @"someoneowes"; 
    }else{ 
     wow=@"nope"; 
    } 
    MasterViewController *master = [[MasterViewController alloc]init]; 
    bool OwedYes = dateOwed; 
    [master setData:iField.text :editedMoney :picker.date :OwedYes :wow :dateAsString]; 
    NSManagedObjectContext *context = [self managedObjectContext]; 


    [UIView beginAnimations:@"LeftFlip" context:nil]; 
    [UIView setAnimationDuration:0.8]; 
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; 
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.view.superview cache:YES]; 
    [UIView commitAnimations]; 
     [self dismissViewControllerAnimated:YES completion:nil]; 
    [self.view.superview removeFromSuperview]; 


    NSLog(@"TEH %@", context); 
} 

的的NSLog上的VC＃頂部2報告正確的字符串，但如果我嘗試使用或比較字符串，它似乎不工作。

Answer 1

這

InputViewController *input = [[InputViewController alloc]init]; 
self.tdModal = input; 

在分配財產

新InputViewController並將其存儲但這

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main_iPhone" bundle:nil]; 
    InputViewController *viewController = (InputViewController *)[storyboard instantiateViewControllerWithIdentifier:@"VDI"]; 
    [self presentViewController:viewController animated:YES completion:nil]; 

另一箇中分配和InputViewController顯示它。

這

[self.tdModal setDetailItem:@"NotOwed"]; 

設置detailItem屬性在原視圖控制器 - 你沒有顯示的一個。

你想要的是

-(IBAction)NotOwed:(id)sender{ 

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main_iPhone" bundle:nil]; 
     self.tdModal = (InputViewController *)[storyboard instantiateViewControllerWithIdentifier:@"VDI"]; 
    [[self presentViewController:self.tdModal animated:YES completion:nil]; 
    [self.tdModal setDetailItem:@"NotOwed"]; 


    // do any setup you need for myNewVC 
    [self dismissSemiModalViewController:self]; 
} 

或者，因爲你要關閉當前VC，你可以與當地InputViewController變量堅持 - 你需要是一致的，要麼使用本地變量或財產。

另外，如果InputViewController與您當前的視圖控制器來自同一個故事板，則可以將它們與一個segue關聯並觸發segue。然後您可以設置詳細項目prepareForSegue