'NSInvalidArgumentException'，原因：' - [UINavigationController setMed：]：無法識別的選擇發送到實例0x746dda0'

Question

我正在製作一個應用程序，將幫助有特定健康狀況的人管理他們的藥物。我創建了一種模式來添加使用核心數據工作並保存新葯物的藥物。

我現在正試圖讓人們在保存後編輯藥物。要做到這一點，我試圖發送藥物的管理對象到「fibromappMedsEditViewController」，並在類的viewDidLoad方法中分配信息。

我不斷收到此錯誤：

'NSInvalidArgumentException', reason: '-[UINavigationController setMed:]: unrecognized selector sent to instance 0x746dda0' 

有誰告訴我什麼，我做錯了什麼？

在fibromappMedsListViewController.m相關方法

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ //selMed declared at top of file as NSManagedObject *selMed; 
    selMed = [self.meds objectAtIndex:indexPath.row]; 
    NSLog(@"SELECTED MED: %@",[selMed valueForKey:@"name"]); 
    UIStoryboardSegue *segueString = [NSString stringWithFormat:@"%@",@"editMeds"]; 

    NSLog(@"%@",segueString); 

    [self performSegueWithIdentifier:@"editMeds" sender:indexPath]; 

} 

-(void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{ 


    NSLog(@"%@",segue.destinationViewController); 

    NSLog(@"%@",[selMed valueForKey:@"name"]); 

    fibroMappMedsEditViewController *dest = segue.destinationViewController; 
    dest.med = selMed; 


} 

的fibroMappMedsEditViewController.h

#import <UIKit/UIKit.h> 

@interface fibroMappMedsEditViewController : UITableViewController 
- (IBAction)saveChanges:(id)sender; 
- (IBAction)deleteBtnPressed:(id)sender; 
- (IBAction)dosageChanged:(id)sender; 
- (IBAction)maxDosageChanged:(id)sender; 
- (IBAction)cancel:(id)sender; 
- (IBAction)typeChanged:(id)sender; 

@property (weak, nonatomic) IBOutlet UITextField *tbName; 
@property (weak, nonatomic) IBOutlet UITextField *tbDose; 
@property (weak, nonatomic) IBOutlet UITextField *tbMaxDose; 
@property (weak, nonatomic) IBOutlet UITextField *tbType; 
@property (weak, nonatomic) IBOutlet UIStepper *stepperDose; 
@property (weak, nonatomic) IBOutlet UIStepper *stepperMaxDose; 
@property (weak, nonatomic) IBOutlet UISegmentedControl *changeMeasure; 
@property (strong, nonatomic) NSManagedObject *med; 

@end 

的fibroMappMedsEditViewController.m - 只是我改變影響的方式，部分控制器負載

#import "fibroMappMedsEditViewController.h" 
#import "fibroMappAppDelegate.h" 
#import <CoreData/CoreData.h> 

@interface fibroMappMedsEditViewController() 

@end 

@implementation fibroMappMedsEditViewController 


@synthesize tbName; 
@synthesize tbDose; 
@synthesize tbMaxDose; 
@synthesize tbType; 
@synthesize med; 
double dose; 
double maxDose; 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    tbName.text = [med valueForKey:@"name"];//name is a string in the model 
    tbDose.text = [med valueForKey:@"dose"];//dose is a double in the model 
    tbMaxDose.text = [med valueForKey:@"maxDose"];//maxDose is a double in the model 
    tbType.text = [med valueForKey:@"type"];//type is a string in the model 

} 

如果您需要查看其他內容，請隨時詢問。

此外，我正在使用這個應用程序的故事板。

Answer 1

從該日誌中可以看出，您的fibroMappMedsEditViewController（應該以大寫字母BTW開頭）嵌入導航控制器中。你需要去那個導航控制器的根視圖控制器。

-(void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{ 
    UINavigationController *nav = segue.destinationViewController; 
    fibroMappMedsEditViewController *dest = (fibroMappMedsEditViewController *)nav.topViewController; 
    dest.med = selMed; 
}