I looked at lots of threads about delegation but couldn't find why this isn't working
I have UINavigationController in storyboard in Xcode 5 and here is how the delegate is assigned:
in MasterViewController I have:
//
// MasterViewController.h
//
#protocol MyViewDelegate
#required
- (void) getBackContacts:(NSArray *)c andEmails:(NSArray *)e;
#end
#interface ListContactsViewController : UITableViewController <MyViewDelegate> {
}
#property (strong, nonatomic) NSString* myString;
#property (strong, nonatomic) ABContact* currentML;
#end
//
// MasterViewController.m
//
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
DetailtViewController *vc = [segue destinationViewController];
vc.delegate = self;
vc.currentML = _currentML;
vc.contacts = _contacts;
vc.emails = _emails;
}
- (void) getBackContacts:(NSArray *)c andEmails:(NSArray *)e
{
_contacts = [NSMutableArray arrayWithArray:c];
_emails = [NSMutableArray arrayWithArray:e];
}
for DetailViewController I have:
//
// DetailViewController.h
//
#protocol MyViewDelegate;
#interface SelectContactViewController : UITableViewController {
id< MyViewDelegate > delegate;
}
-(IBAction) save;
#property (nonatomic, strong) id< MyViewDelegate > delegate;
#property (strong, nonatomic) ABContact* currentML;
#property (strong, nonatomic) NSMutableArray* contacts;
#property (strong, nonatomic) NSMutableArray* emails;
//
// DetailViewController.m
//
- (IBAction) save
{
// *** this line compiles with error
[delegate getBackContacts:_contacts andEmails:_emails];
}
When I compile compiler says:
No known instance method for selector 'getBackContacts:andEmails:'
Related
I need to pass complex double value from ViewController to another ViewController. XCODE prompted me with this error "Assigning to NSString from incompatible type 'complex number'"
ViewController.m
complex double A=0+0*I;
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if([segue.identifier isEqualToString:#"Calculate"]){
[self ComputeABCD];
ResultViewController *controller = (ResultViewController *)segue.destinationViewController;
controller.textContent = cascadedA;
}
}
ResultViewController.m
#implementation ResultViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.result.text = self.textContent;
}
ResultViewController.h
#interface ResultViewController : UIViewController
#property (strong, nonatomic) IBOutlet UILabel *result;
#property (nonatomic, assign) complex double textContent;
#property (nonatomic, assign) complex double textValue;
#end
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
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.
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.
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];
}
}
I have two storyboards and each one has its own respective view controller but I need to change the appearance of the second storyboard based on the button pressed in the first view controller.
In the first view controller I have:
// First view controller .h
#import <UIKit/UIKit.h>
#import "SecondViewController.h"
#interface FirstViewController : UIViewController
#property (strong, nonatomic) IBOutlet UIButton *LevelOneButton; // tag 0
#property (strong, nonatomic) IBOutlet UIButton *LevelTwoButton; // tag 1
-(IBAction)selectLevel:(UIButton *)sender; // both buttons connected to this method
#property (assign, nonatomic) int levelSelect;
#end
then in the first .m file:
//FirstViewController.m
-(IBAction)selectLevel:(UIButton *)sender {
if (sender.tag == 0) {
_levelSelect = 0;
}
if (sender.tag == 1) {
_levelSelect = 1;
}
}
This code works fine but the problem occurs in the secondViewController that I have. When I try and access the levelSelect property in the SecondViewController I get the errors "Property 'levelSelect' not found on object of type 'FirstViewController'" or "Unexpected identifier levelSelect" or something among those lines. I've tried every single thing I could think of and every question I found on StackOverflow relating to this but none have fixed the problem. Anyone know what I'm doing wrong?
You should be setting the property on the second view controller as you're pushing or segueing.
So in your first view controller it should look something like this:
#import "ViewController.h"
#import "SecondViewController.h"
#interface ViewController ()
#property (strong, nonatomic) IBOutlet UIButton *levelOne;
#property (strong, nonatomic) IBOutlet UIButton *levelTwo;
#property (assign, nonatomic) int selectedLevel;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.levelOne.tag = 1;
self.levelTwo.tag = 2;
}
- (IBAction)selectLevel:(UIButton *)sender
{
if (sender.tag == 1) {
self.selectedLevel = 1;
} else {
self.selectedLevel = 2;
}
[self performSegueWithIdentifier:#"pushToSecond" sender:self];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
SecondViewController *dest = segue.destinationViewController;
dest.levelSelect = self.selectedLevel;
}
#end
Now, when viewDidLoad gets called on the SecondViewController that property will be set and you can use it. Like so:
#import "SecondViewController.h"
#interface SecondViewController ()
#property (strong, nonatomic) IBOutlet UILabel *levelLabel;
#end
#implementation SecondViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.levelLabel.text = [#(self.levelSelect) stringValue];
}
#end
Quick Edit, if you're not using segues you can do the same thing by pushing manually. Would look something like:
- (IBAction)selectLevel:(UIButton *)sender
{
if (sender.tag == 1) {
self.selectedLevel = 1;
} else {
self.selectedLevel = 2;
}
SecondViewController *secondVC = [[UIStoryboard storyboardWithName:#"Main" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:#"second"];
secondVC.levelSelect = self.selectedLevel;
[self.navigationController pushViewController:secondVC animated:YES];
}
I'm building my first iOS app to try and learn iOS coding. However, I need to pass a value xAuthToken from one controller to the other. I can't seem to get it working to. I init the value in the first controller ViewController, but then I need it in SettingsController. I keep getting errors and the one it throws now is: Property 'ViewController' not found on object of type 'ViewController'
What am I doing wrong?
ViewController.h
#import <UIKit/UIKit.h>
#import "SettingsController.h"
#interface ViewController : UIViewController <UITextFieldDelegate>
#property (weak, nonatomic) IBOutlet UITextField *txtUsername;
#property (weak, nonatomic) IBOutlet UITextField *txtPassword;
- (IBAction)sigininClicked:(id)sender;
- (IBAction)backgroundTap:(id)sender;
#end
ViewController.m
#import "ViewController.h"
#interface ViewController ()
#property (nonatomic) NSString *xAuthToken;
#end
#implementation ViewController
- (IBAction)sigininClicked:(id)sender {
NSString *xAuthToken = #"0";
self.viewController = [[SettingsController alloc] init];
self.viewController.xAuthToken = xAuthToken;
[self performSegueWithIdentifier:#"login_success" sender:self];
}
SettingsController.h
#import <Foundation/Foundation.h>
#interface SettingsController : UIViewController
#end
SettingsController.m
#interface SettingsController ()
#property (weak, nonatomic) IBOutlet UITextField *myTextField;
#property (weak, nonatomic) IBOutlet UISwitch *mySwitch;
#end
#implementation SettingsController
//THIS IS WHERE I NEED XAUTHTOKEN
If you have a segue that presents your SettingsController, pass the information it needs in prepareForSegue. Don't create a new local SettingsController.
You can do something like
viewController = [self.storyboard instantiateviewcontrollerwithidentifier:#"your vc name"];
viewController.Xauthtoken = data;
// Do something else with this.
Or another way ( I don't know if it's good or bad, use it while your vc is already active ):
Use NSNotificationCenter and pass values between it.
Third way is create delegate for first Viewcontroller.
Try this in your ViewController.m:
#import "ViewController.h"
#interface ViewController ()
#property (nonatomic) NSString *xAuthToken;
#end
#implementation ViewController
- (IBAction)sigininClicked:(id)sender {
xAuthToken = #"Your Value Here";
[self performSegueWithIdentifier:#"login_success" sender:self];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"login_success"]) {
SettingsController *destViewController = segue.destinationViewController;
destViewController.xAuthToken = xAuthToken;
}
}
And in your SettingsController.h
#import <Foundation/Foundation.h>
#interface SettingsController : UIViewController
#property (nonatomic,strong) NSString *xAuthToken;
#end
SettingsController.m
#interface SettingsController ()
#property (weak, nonatomic) IBOutlet UITextField *myTextField;
#property (weak, nonatomic) IBOutlet UISwitch *mySwitch;
#end
#implementation SettingsController
-(void)viewDidLoad{
NSLog("%#",xAuthToken);
}
I've got 2 views. The firstView and the secondView. The firstView needs the favourites array from the secondView, so I try to call the getFavourites method defined in the protocol. This returns null however, which seems strange to me because everything makes sense.
Here is the firstViewController.h:
#import <UIKit/UIKit.h>
#import "Drink.h"
#protocol firstViewControllerDelegate;
#interface FirstViewController : UIViewController
{
id <firstViewControllerDelegate> delegate;
NSMutableArray *labels;
UIButton *button1;
UIButton *button2;
UIButton *button3;
UIButton *button4;
}
- (IBAction) buttonClick: (id) sender;
#property (nonatomic, assign) id <firstViewControllerDelegate> delegate;
#property (nonatomic, retain) IBOutlet UIButton *button1;
#property (nonatomic, retain) IBOutlet UIButton *button2;
#property (nonatomic, retain) IBOutlet UIButton *button3;
#property (nonatomic, retain) IBOutlet UIButton *button4;
#end
#protocol firstViewControllerDelegate
- (NSMutableArray *) getFavourites;
- (void) setFavourites: NSMutableArray;
#end
firstViewController.m
#synthesize delegate;
.......
- (void) viewWillAppear:(BOOL)animated
{
NSMutableArray *favourites = [delegate getFavourites]; // favourites is empty after this line
[button1 setTitle:[[favourites objectAtIndex:1] name] forState:UIControlStateNormal];
NSLog(#"VIEW APPEARED. BUTTON TITLE IS: %#", button1.currentTitle);
}
SecondViewController.h
#import <UIKit/UIKit.h>
#import "FirstViewController.h"
#interface SecondViewController: UIViewController <UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate, firstViewControllerDelegate>
{
NSMutableArray *favourites;
NSMutableArray *drinks;
}
#property (nonatomic, retain) NSMutableArray *drinks;
#property (nonatomic, retain, getter = getFavourites) NSMutableArray *favourites;
- (void) addDrink: (NSString *) name;
#end
Does anybody have any idea why this isn't working?
Are you sure you're setting the delegate property of FirstViewController? i.e.:
FirstViewController *firstController = // Instantiate the controller;
firstController.delegate = secondController;
[self.navigationController pushViewController:firstController animated:YES];
secondController should exist before instantiation, otherwise you're setting a nil value