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Accessing Method from other Classes Objective-C
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Closed 9 years ago.
This is my viewcontroller1.m buttons userinteractionenabled function,
-(void) BtnUserInteractionStatus {
oneBtn2.userInteractionEnabled = NO;
oneBtn3.userInteractionEnabled = NO;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self BtnUserInteractionStatus];
}
This is my viewcontroller2.m buttons userinteractionenabled function access from viewcontroller1.m,
#import "ViewController1.h"
- (void)viewDidLoad {
[super viewDidLoad];
svc = [[StageViewController alloc]init];
[svc BtnUserInteractionStatus];
}
my viewcontroller2.h,
#import "ViewController1.h"
#interface ViewController2 : UIViewController {
StageViewController *svc;
}
#property (assign) StageViewController *svc;
But, this is not working. If there is any wrong please correct it.
This will be your ViewController2.m
#import "ViewController1.h"
- (void)viewDidLoad
{
[super viewDidLoad];
svc = [[ViewController1 alloc]initWithNibName:#"ViewController1" bundle:nil];
[self.view addSubview:svc.view];
}
ViewController2.h
#import "ViewController1.h"
#interface ViewController2 : UIViewController
{
ViewController1 *svc;
}
ViewController1.m
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self)
{
// Custom initialization
[self BtnUserInteractionStatus]; /*Provide your call to BtnUserInteractionStatus within init function*/
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
-(void)BtnUserInteractionStatus
{
oneBtn2.userInteractionEnabled = NO;
oneBtn3.userInteractionEnabled = NO;
}
Whenever you want the object library elements of a viewController loaded from another ViewContoller you need to define its xib and then add its corresponding view as either a subview of the present viewcontroller or push the viewcontrller from the current ViewController .Simply calling the BtnUserInteractionStatus method using its currently created instance wont help..
Hope it Helps !!
Related
I am trying to get a string from a view controller to another using delegate method.But the delegate method is not getting called.Below is the code
#protocol CustomDelegate<NSObject>
-(void)didDataRecieved;
#end
#interface CustomController:UIViewController
#property id<CustomDelegate>delegate;
#property(retain,nonatomic)NSString *string;
#end
#implementaion CustomController
-(void)viewDidLoad
{
string=#"hello";
if([self.delegate respondsToSelector#selector(didDataRecived)]) {
[self.delegate didDataRecieved];
}
}
-(IBACTION)gotoViewController
{
ViewController *view=[self.storyboard instantiateViewController:#"View"];
[self.navigationController pushViewController:view aniamted:YES];
}
#end
#interface ViewController:UIViewController<CustomDelegate>
#property (nonatomic,retain)CustomController *cust;
#end
#implementation ViewController
-(void)viewDidLoad
{
self.cust=[[CustomController alloc]init];
self.cust.delegate=self;
}
-(void)didDataRecieved
{
NSLog(#"data %#",self.cust.string);
}
#end
Can anyone point out where am going wrong...plz help.
edited the code..tried this way too.
if([self.delegate respondsToSelector#selector(didDataRecived)]){
[self.delegate didDataRecieved];
}
I will give you the sample coding.Customize the below code.
Here we have two view controllers.
ViewController
and
SecondViewController
in SecondViewController
.h
#import <UIKit/UIKit.h>
#class SecondViewController;
#protocol SecondViewControllerDelegate <NSObject>
- (void)secondViewController:(SecondViewController *)secondViewController didEnterText:(NSString *)text;
#end
#interface SecondViewController : UIViewController
#property (nonatomic, assign)id<SecondViewControllerDelegate> delegate;
#property (nonatomic, strong) IBOutlet UITextField *nameTextField;//It must connect as outlet connection
- (IBAction)doneButtonTapped:(id)sender;
#end
.m
#import "SecondViewController.h"
#interface SecondViewController ()
#end
#implementation SecondViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}
//Either use NSNotification or Delegate
- (IBAction)doneButtonTapped:(id)sender;
{
//Use Notification
[[NSNotificationCenter defaultCenter] postNotificationName:#"passingDataFromSecondViewToFirstView" object:self.nameTextField.text];
//OR Custom Delegate
[self.delegate secondViewController:self didEnterText:self.nameTextField.text];
[self.navigationController popViewControllerAnimated:YES];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
in ViewController
.h
#import <UIKit/UIKit.h>
#import "SecondViewController.h"
#interface ViewController : UIViewController<SecondViewControllerDelegate>
#property (nonatomic, strong) IBOutlet UILabel *labelName; //You must connect the label with outlet connection
- (IBAction)gotoNextView:(id)sender;
#end
.m
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
//addObserver here...
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(textFromPreviousViewControllerNotificationReceived:) name:#"passingDataFromSecondViewToFirstView" object:nil];
// Do any additional setup after loading the view, typically from a nib.
}
//addObserver Method here....
- (void)textFromPreviousViewControllerNotificationReceived:(NSNotification *)notification
{
// set text to label...
NSString *string = [notification object];
self.labelName.text = string;
}
- (IBAction)gotoNextView:(id)sender;
{
//If you use storyboard
SecondViewController *secondViewController = [self.storyboard instantiateViewControllerWithIdentifier:#"SecondViewController"];
//OR If you use XIB
SecondViewController *secondViewController = [[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
secondViewController.delegate = self;
[self.navigationController pushViewController:secondViewController animated:YES];
}
//Calling custom delegate method
- (void)secondViewController:(SecondViewController *)secondViewController didEnterText:(NSString *)text
{
self.labelName.text = text; //Getting the data and assign the data to label here.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
For your understanding the code I create a simple passing data from one second view controller to first view controller.
First we navigate the view from first view controller to second view controller.
After that we send the data from second view controller to first view controller.
NOTE : You can either use NSNotification or Custom Delegate method for sending data from One View Controller to Other View Controller
If you use NSNotification, you need to set the postNotificationName for getting data in button action method.
Next you need to write addObserver in (sending data to your required View Controller) ViewController and call the addObserver method in same View Controller.
If you use custom delegate,
Usually we go with Custom Protocol Delegate and also we need to Assign the delegate here.
Very importantly we have to set the Custom Delegate Method in the Second View Controller.Because where we send the data to first view controller once we click the done button in second view controller.
Finally we must call the Custom Delegate Method in First View Controller, where we get the data and assign that data to label.Now you can see the passed data using custom delegate.
Likewise you can send the data to other view controller using Custom Delegate Methods
how you pushing your second controller? i cant see.
but your code working for me.
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
ViewController1 *vc = [ViewController1 new];
vc.delegate = self;
[self presentViewController:vc animated:YES completion:nil];
}
-(void)didDataRecieved
{
NSLog(#"recieved");
}
#end
I have a view with a label in it. The lower side of this view is filled with a subview which has it’s own view controller. This subview has a button. My goal: I want to change the label by pressing the button in the subview.
I have tried the code beneath. It works fine when I let the ViewWillAppear method of the delegate call the ‘doSomeTask’ method of the SubviewController. A timer begins to count and after a few seconds, the SubviewController calls the delegates changeLabel method, and the label is changed. However, when I call the ‘doSomeTask’ method manually by pressing the button, the delegate isn’t listening. The call doesn’t reach the changeLabel method.
Probably I am doing something ridiculously stupid here. Forgive me, I’m just learning iOS programming. Thanks in advance for all the feedback.
MyViewController.h
#import <UIKit/UIKit.h>
#import "MySubViewController.h"
#interface MyViewController : UIViewController
#property (strong, nonatomic) IBOutlet UIView *detailView;
#property (strong, nonatomic) IBOutlet UILabel *theLabel;
- (IBAction)changeLabel:(id)sender;
#end
MyViewController.m
#import "MyViewController.h"
#import "MySubViewcontroller.h"
#interface MyViewController ()
#end
#implementation MyViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
MySubViewController *subVC = [[MySubViewController alloc] init];
[self addChildViewController:subVC];
[self.detailView addSubview:subVC.view];
// [subVC setDelegate:self]; (no success trying this)
[subVC didMoveToParentViewController:self];
}
-(void)viewWillAppear:(BOOL)animated
{
MySubViewController *mySubVC = [[MySubViewController alloc] init];
[mySubVC setDelegate:self];
[mySubVC doSomeTask]; // this works fine
}
// delegate method
- (void)changeLabel{
self.theLabel.text = #"Hello!";
}
MySubviewController.h
#import <UIKit/UIKit.h>
#protocol MySubViewControllerDelegate <NSObject>
#required
- (void)changeLabel;
#end
#interface MySubViewController : UIViewController
#property (nonatomic, assign) id delegate;
- (IBAction)changeButton:(id)sender;
- (void)doSomeTask;
- (void)goChangeLabel;
#end
MySubViewController.m
#import "MySubViewController.h"
#interface MySubViewController ()
#end
#implementation MySubViewController
#synthesize delegate;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
- (void)goChangeLabel
{
[[self delegate] changeLabel];
}
- (void)doSomeTask
{
[NSTimer scheduledTimerWithTimeInterval:5.0 target:self selector:#selector(goChangeLabel) userInfo:nil repeats:NO];
}
- (IBAction)changeButton:(id)sender {
// [self doSomeTask]; (no succes trying this)
}
#end
Your problem is this:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
MySubViewController *subVC = [[MySubViewController alloc] init];
[self addChildViewController:subVC];
[self.detailView addSubview:subVC.view];
// [subVC setDelegate:self]; (no success trying this)
[subVC didMoveToParentViewController:self];
}
-(void)viewWillAppear:(BOOL)animated
{
MySubViewController *mySubVC = [[MySubViewController alloc] init];
[mySubVC setDelegate:self];
[mySubVC doSomeTask]; // this works fine
}
In these 2 methods you have created 2 separate variables of type MySubViewController. You have only set the delegate on the variable created inside viewWillAppear.
These are not static classes, singletons or anything else similar. If you create a variable of one type it is in no way linked to the other. The same way you can create multiple NSString's that have no bearing on each other.
Create it like so:
#implementation MyViewController
{
MySubViewController *_subVC;
}
- (void)viewDidLoad
{
[super viewDidLoad];
_subVC = [[MySubViewController alloc] init];
}
now you can use _subVC everywhere in that file as the one reference
I'm trying to implement simgle AdBanner instance for multiple views in an iOS app. For implementing AdbannerDelegate in a viewController one has to do
bannerview.delegate= self;
where bannerview is an instance of AdBannerView. This delegate method however has to be implemented in every viewController which amounts up to a lot of repeating code. How can I make up a simple class that implements all delegate methods and then I call use them in every viewController.
I think the viewControllers you are using are subclasses of UIViewController.
And you are saying all the viewControllers have the same delegate methods.
So,what i want to do is create new ViewController class (UIDelgateViewController) by SubClassing UIViewController and add all delegate methods there , and have all the other viewControllers subclass UIDelgateViewController.
The code goes like this,
.h file->
#interface UIDelegateViewController : UIViewController<ADBannerViewDelegate>
#property ADBannerView *bannerView;
#end
.m file ->
#import "UIDelegateViewController.h"
#interface UIDelegateViewController ()
#end
#implementation UIDelegateViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
_bannerView = [[ADBannerView alloc] init];
_bannerView.delegate =self;
}
-(void)bannerDelegateMethod{
}
Now your Some viewController ->
#import "UIDelegateViewController.h"
#interface SomeViewController : UIDelegateViewController
#end
#import "SomeViewController.h"
#interface SomeViewController ()
#end
#implementation SomeViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[self.view addSubview:self.bannerView];
self.bannerView.frame = ..../
}
If you want to keep always on the screen the same banner while navigating and changing views, you should consider to use View Controller containtment API
A great example is that remarkable sample code written by Apple, that shows how to keep the same banner instance while moving in a tabbar or navigation controller. It could be also a great start for you project.
I have two view controllers: BSViewController and BSotherViewController. BSViewController has a button on it that is segues to BSotherViewController. That part works fine and I can see the one VC and then the "other" VC when I run on the simulator. But I have an NSLog(#"other"); in BSotherViewController's -viewDidLoad which is not showing in the console. A similar NSLog(#"other"); in BSViewController's -viewDidLoad which is showing in the console. I suspect the problem is the lack of an IBAction but I cannot figure where it should go and how it should be linked in the storyboard.
BSViewController.h
#import <UIKit/UIKit.h>
#interface BSViewController : UIViewController
#property (nonatomic) NSInteger number;
#end
BSViewController.m
#import "BSViewController.h"
#interface BSViewController ()
#end
#implementation BSViewController
#synthesize number;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.number = 25;
NSLog(#"number: %d", self.number);
}
#end
BSotherViewController.h
#import <UIKit/UIKit.h>
#interface BSotherViewController : UIViewController
#property (nonatomic) NSInteger anumber;
#end
BSotherViewController.m
#import "BSotherViewController.h"
#include "BSViewController.h"
#interface BSotherViewController ()
#end
#implementation BSotherViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
NSLog(#"other number:");
[super viewDidLoad];
// Do any additional setup after loading the view.
BSViewController *view = [[BSViewController alloc] init];
self.anumber = view.number;
NSLog(#"other number: %d", self.anumber);
}
In the storyboard is the second view controller set up as a BSotherViewController? You can verify by hovering over the view controller icon in the storyboard.
If it's not, then click it and go to the identity controller and type it in.
Header file:
#import <UIKit/UIKit.h>
#interface PFXTabControllerViewController : UITabBarController <UITabBarControllerDelegate>
#end
Implementation file:
#import "PFXTabControllerViewController.h"
#interface PFXTabControllerViewController ()
#end
#implementation PFXTabControllerViewController
- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item {
NSLog(#"tabBar didSelectItem");
}
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {
NSLog(#"tabBarController didSelectViewController");
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.tabBarController.delegate = self; // Tried it both with and without this.
}
The UITabBarcontroller shows just fine, with the tab bar. Clicking on a tab fires didSelectItem but it does not fire didSelectViewController which is the event I need to handle. The UITabBarcontroller is loading and showing different subclasses of UIViewController.
UPDATE Changing that self.tabBarController.delegate = self line to self.delegate = self works, and both fire. I don't understand why this is necessary. Setting self.delegate = self seems... silly. Any ideas?
Just change the header as follows :
#import <UIKit/UIKit.h>
#interface PFXTabControllerViewController : **UIViewController** <UITabBarControllerDelegate>
#end