unrecognized selector at popover segue - ios

Question

I'm using this code in my app to pass data with the corresponding seque:
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"readMoreDetail"]) {
MoreViewController *destinationViewController = segue.destinationViewController;
destinationViewController.openSubject = [self.detailItem description];
} else if ([segue.identifier isEqualToString:#"notesSegue"]) {
NSLog(#"segue");
NotesTableViewController *destinationViewController = segue.destinationViewController;
destinationViewController.openSubject = [self.detailItem description];
} else {
// Do nothing
}
}
I've embedded a UIViewController in a NavigationController and created a popover segue from another UIViewController to the NavigationController - but when I navigate I get this error:
-[UINavigationController setOpenSubject:]: unrecognized selector sent to instance 0x15e532a0
Any ideas why?
Thanks!
NotesTableViewController.h
#import <UIKit/UIKit.h>
#interface NotesTableViewController : UITableViewController <UINavigationControllerDelegate>
#property(nonatomic, strong)NSString *openSubject;
#end
NotesTableViewController.m
#import "NotesTableViewController.h"
#interface NotesTableViewController ()
{
NSMutableArray *_objects;
}
#end
#implementation NotesTableViewController
#synthesize openSubject;
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
if (openSubject.length == 0) {
// There's currently no subject open, write it in the navigationbar
// Prompt = open subject
// Title = notes header
self.navigationItem.prompt = #"No subject selected";
self.navigationItem.title = #"My Notes";
} else {
// Open the subject
// Prompt = notes header
// Title = open subject
self.navigationItem.prompt = openSubject;
self.navigationItem.title = #"My notes";
// Load the notes data
// Create the key
NSString *partOfKey = #"-notes";
NSString *notesKey = [NSString stringWithFormat:#"%#%#", openSubject, partOfKey];
// Load the _objects from NSUserdefaults
_objects = [[NSUserDefaults standardUserDefaults] objectForKey:notesKey];
}
// Uncomment the following line to preserve selection between presentations.
// self.clearsSelectionOnViewWillAppear = NO;
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
self.navigationItem.leftBarButtonItem = self.editButtonItem;
// Register a class or nib file using registerNib:forCellReuseIdentifier
// o registerClass:forCellReuiseIdentifier: method before calling this method
[self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:#"Cell"];
}
- (void)awakeFromNib
{
self.clearsSelectionOnViewWillAppear = NO;
self.preferredContentSize = CGSizeMake(320.0, 600.0);
[super awakeFromNib];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)addNote:(id)sender {
// Create a new note
if (openSubject.length == 0) {
// The openSubject is nil, can't add a subject - tell the user
UIAlertView *alert = [[UIAlertView alloc] initWithTitle: #"No subject" message: #"Please select a subject prior to adding a note" delegate: nil cancelButtonTitle:#"OK" otherButtonTitles:nil]; [alert show];
} else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"New note" message:#"Enter a note" delegate:self cancelButtonTitle:#"Cancel" otherButtonTitles:#"Add", nil];
alert.alertViewStyle = UIAlertViewStylePlainTextInput;
[alert show];
}
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
// The user created a new subject, add it
if (buttonIndex == 1) {
// Get the input text
NSString *newNote = [[alertView textFieldAtIndex:0] text];
// Initialize objects
if (!_objects) {
_objects = [[NSMutableArray alloc] init];
}
// Check if the note already exist
if ([_objects containsObject:newNote]) {
// Tell the user this note already exists
UIAlertView *alert = [[UIAlertView alloc] initWithTitle: #"Already exists" message: #"This note already exist, sorry" delegate: nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
} else {
// The note doesn't exist, add it
[_objects insertObject:newNote atIndex:0];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self.tableView insertRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
// Save the new _objects
[self saveObjects];
}
}
}
-(void)saveObjects {
// Create the key
NSString *partOfKey = #"-notes";
// Save the new objects
NSString *notesKey = [NSString stringWithFormat:#"%#%#", openSubject, partOfKey];
[[NSUserDefaults standardUserDefaults] setObject:_objects forKey:notesKey];
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
#warning Potentially incomplete method implementation.
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return _objects.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"Cell" forIndexPath:indexPath];
NSString *object = _objects[indexPath.row];
cell.textLabel.text = [object description];
return cell;
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
[_objects removeObjectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationFade];
// Save the new objects
[self saveObjects];
} else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
}
}
/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the specified item to be editable.
return YES;
}
*/
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
#end
(I trust everyone to not steal this code)

Answer 1

If you trigger a segue to a UINavigationController the segue.destinationViewController will be the navigation controller and not the view controller contained in the navigation controller.
You can however get a reference to your NotesTableViewController:
UINavigationController *navController = segue.destinationViewController;
NotesTableViewController *notesTableVC = (NotesTableViewController *)[navController topViewController];
and then you can use
notesTableVC.openSubject = [self.detailItem description];
etc. to set the properties in your NotesTableViewController.

Answer 2

make sure your segue Identifiers are identified correctly as "notesSegue" and "readMoreDetail" , sometime you have to clean the project and run it again.