Objective-C issue with Segue - ios

Question

I have this Segue here:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([[segue identifier] isEqualToString:#"showDetail"]) {
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
//NSDate *object = self.objects[indexPath.row];
NSString *strPOIndex = [self.tableData[indexPath.row] valueForKey:#"POIndex"];
LHPurchaseOrderDetail *controller = (LHPurchaseOrderDetail *)[[segue destinationViewController] topViewController];
[controller setDetailItem:strPOIndex];
controller.navigationItem.leftBarButtonItem = self.splitViewController.displayModeButtonItem;
controller.navigationItem.leftItemsSupplementBackButton = YES;
}
}
and what I am trying to do with it is pass strPOIndex to setDetailItem in my detail controller from my master controller.. but when I run this, I get an error:
-[LHPurchaseOrderMaster setDetailItem:]: unrecognized selector sent to instance 0x156cce80
I dont understand why this is happening, is it an issue with my storyboard? or my master controller or detail controller? Here is my Detail Controller:
.h:
#import <UIKit/UIKit.h>
#interface LHPurchaseOrderDetail : UIViewController
#property (strong, nonatomic) IBOutlet UINavigationBar *NavBar;
#property (strong, nonatomic) id detailItem;
#property (weak, nonatomic) IBOutlet UILabel *detailDescriptionLabel;
#end
.m:
#import "LHPurchaseOrderDetail.h"
#interface LHPurchaseOrderDetail ()
#end
#implementation LHPurchaseOrderDetail
- (void)setDetailItem:(id)newDetailItem {
if (_detailItem != newDetailItem) {
_detailItem = newDetailItem;
// Update the view.
[self configureView];
}
}
- (void)configureView {
// Update the user interface for the detail item.
if (self.detailItem) {
self.detailDescriptionLabel.text = [self.detailItem description];
}
}
- (void)viewDidLoad {
[super viewDidLoad];
[self configureView];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
#end
Master Controller:
.h
#import <UIKit/UIKit.h>
#import "ShinobiDataSource.h"
#import "PopupGenerator.h"
#class LHPurchaseOrderDetail;
#interface LHPurchaseOrderMaster : UITableViewController<UIPopoverControllerDelegate, UIPickerViewDelegate>
#property (strong, nonatomic) IBOutlet UIButton *communityBtn;
#property (strong, nonatomic) IBOutlet UIButton *lotBtn;
#property (strong, nonatomic) IBOutlet UIButton *goBtn;
- (IBAction)communityBtnPressed:(id)sender;
- (IBAction)lotBtnPressed:(id)sender;
- (IBAction)goBtnPressed:(id)sender;
#property(nonatomic, retain) NSArray * tableData;
#property (strong, nonatomic) LHPurchaseOrderDetail *purchaseOrderController;
#end

Answer 1

Your error is this:
-[LHPurchaseOrderMaster setDetailItem:]: unrecognized selector sent to instance 0x156cce80
so it seems that somewhere in your LHPurchaseOrderMaster class you're trying to access and set the detailItem property as if it would be a part of LHPurchaseOrderMaster but because it doesn't exist there, you get an unrecognized selector error.
Edit
You should check for three things:
In Interface Builder check that the segue from LHPurchaseOrderMaster ViewController is to an UINavigationController that embeds the LHPurchaseOrderDetail ViewController as the first view controller in its stack.
Check the Class name returned by [segue destinationViewController]topViewController] like this:
id obj = [segue destinationViewController]topViewController];
NSLog(#"%#", NSStringFromClass([obj class]));
The class name should be LHPurchaseOrderDetail. If it's not, then you have a problem in your Storyboard where more than certainly you've connected the segue wrong.
Check your LHPurchaseOrderMaster class for any code that tries to access the "detailItem" property as if it would be part of this class.

Answer 2

It seems that the property you are trying to access is not accessible (wrong retrieved object).
Have you tried to use instead of
LHPurchaseOrderDetail *controller = (LHPurchaseOrderDetail *)[[segue destinationViewController] topViewController];
Something like
LHPurchaseOrderDetail *controller = (LHPurchaseOrderDetail *)[[segue destinationViewController] viewControllers][0];
I had sometimes the same your issue.

Answer 3

Set your detailItem not to NSString. Not to id. The problem is here,
self.detailDescriptionLabel.text = [self.detailItem description];
In configureView method change the code as follow,
- (void)configureView {
// Update the user interface for the detail item.
if (self.detailItem) {
self.detailDescriptionLabel.text = self.detailItem;
}
}
Don't forget to change this as well,
- (void)setDetailItem:(NSString *)newDetailItem {
if (_detailItem != newDetailItem) {
_detailItem = newDetailItem;
// Update the view.
[self configureView];
}
}