I am using JKExpandTableView and I want to reload JKExpandTableview. Currently Im calling reloadData method on JKExpandTableView object but it will not call data source delegate method. Thanks.
My header file is like below:
#import "JKExpandTableView.h"
#interface IncidentsViewController : UIViewController <JKExpandTableViewDelegate, JKExpandTableViewDataSource>
#property(nonatomic,weak) IBOutlet JKExpandTableView * expandTableView;
#property(nonatomic,strong) NSMutableArray * dataModelArray;
-(void)refreshIncidentsModule;
#end
And my IncidentsController.m is:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view
[self initializeSampleDataModel];
self.expandTableView.tableViewDelegate = self;
self.expandTableView.dataSourceDelegate = self;
[self deviceOrientationDidChangeNotification:nil];
}
-(void)refreshIncidentsModule
{
[self initializeSampleDataModel];
[self.expandTableView reloadData];
}
in your viewDidLoad method set delegate and datasource.something like followings:
- (void)viewDidLoad
{
self.expandTableView.tableViewDelegate = self;
self.expandTableView.dataSourceDelegate = self;
}
Related
// userprofileform.h(viewcontroller)
#class UserProfileForm;
#protocol UserProfileFormDelegate <NSObject>
- (void) UserProfileFormDelegateReload: (UserProfileForm *) sender;
#end
#interface UserProfileForm : OTSFormViewController <UIActionSheetDelegate>
#property(nonatomic,assign) id <UserProfileFormDelegate> delegate;
#end
//userprofileform.m
#import "UserProfileForm.h"
#implementation UserProfileForm
- (void)endFlow:(id)sender {
[self.delegate UserProfileFormDelegateReload:self];
[self.navigationController popViewControllerAnimated:YES];
}
//shopprofilecontroller.h
#import "UserProfileForm.h"
#interface ShopProfileController : OTSViewController <UserProfileFormDelegate>
#end
//shoprofilecontroller.m
#implementation ShopProfileController
- (void)viewDidLoad
{
[super viewDidLoad];
self.navigationItem.title = #"Business";
UserProfileForm * userProfileForm = [[UserProfileForm alloc] init];
userProfileForm.delegate = self;
}
-(void)UserProfileFormDelegateReload:(UserProfileForm *)sender{
NSLog(#"delegates fired");
}
but the delegate method is not called upon popping the UserProfileForm.
I don't know why is it not firing. I have tried NSNotifications and it did not fire too.
I just tried your code and it worked fine.
The only thing I changed was at the end of viewDidLoad() of ShopProfileController I put the following line:
[userProfileForm endFlow:self];
So your delegate implementation should be correct.
Set a breakpoint within your endFlow() method, I bet its not getting called.
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 been creating a cocoa static library in which I have a public nsobject file where I created a custom delegate. In the app I imported the nsobject file and implemented the delegate but the delegate is not getting called... the static library name is glamApi.
the SKUIDPasser.h file of the NSObject in the library
#import <Foundation/Foundation.h>
#protocol SubClassDelegate <NSObject>
#required
- (void)MethodNameToCallBack:(NSString *)s;
#end
#interface SKUIDPasser : NSObject
-(void)getSKUIDsFromCart:(NSString *)SKUIDs;
#property (nonatomic, weak) id <SubClassDelegate> delegatePasser;
#end
and the SKUIDPasser.m file
#import "SKUIDPasser.h"
#implementation SKUIDPasser
#synthesize delegatePasser;
-(void)getSKUIDsFromCart:(NSString *)SKUIDs{
NSLog(#"getSKUIDsFromCart %#",SKUIDs);
[delegatePasser MethodNameToCallBack:SKUIDs];
}
#end
And the method is called from a Viewcontroller in static library
- (IBAction)CartShowEvent:(id)sender {
if (![cartBadge isHidden]) {
buyClicked = TRUE;
[self loadCart];
[self showCartItemsAll];
self.cartView.frame = self.view.bounds;
[self.view addSubview:self.cartView];
SKUIDPasser *pass = [[SKUIDPasser alloc] init];
[pass getSKUIDsFromCart:#"sssss"];
} else {
[Utilities alert:#"No products to display !!!"];
}
}
The Viewcontroller which the custom delegate has to be implemented Viewcontroller.h
#import <glamAPI/SKUIDPasser.h>
#interface ViewController : UIViewController<SubClassDelegate>{
SKUIDPasser *sk;
}
Viewcontroller.m
- (void)viewDidLoad {
[super viewDidLoad];
sk = [[SKUIDPasser alloc] init];
sk.delegatePasser = self;
NSLog(#"sk.delegatePasser %#",sk.delegatePasser);
}
- (void)MethodNameToCallBack:(NSString *)s
{
NSLog(#"MethodNameToCallBack %#",s);
}
I didn't get any error but the method is not calling..Please help me to resolve this
The very first thing you need to understand is that each instance object of a class is entirely different entity and maintains it's state separately.
In you case your have created an object of your static library in viewDidLoad: and set the delegate accordingly, but when you are making the call to method getSKUIDsFromCart, you are using a different instance for which you never set the delegate property. That's why there was no callback.
To solve this, you can set the delegate in method CartShowEvent: before making the call, something like this
SKUIDPasser *pass = [[SKUIDPasser alloc] init];
pass.delegatePasser = self;
[pass getSKUIDsFromCart:#"sssss"];
However i would suggest that you should use the instance variable of library which you already created in viewDidLoad:
- (IBAction)CartShowEvent:(id)sender {
if (![cartBadge isHidden]) {
buyClicked = TRUE;
[self loadCart];
[self showCartItemsAll];
self.cartView.frame = self.view.bounds;
[self.view addSubview:self.cartView];
//No need to create another object.
//SKUIDPasser *pass = [[SKUIDPasser alloc] init];
//Use the previously created instance object
[sk getSKUIDsFromCart:#"sssss"];
}
else {
[Utilities alert:#"No products to display !!!"];
}
}
The SKUIDPasser object that you are calling within (IBAction)CartShowEvent:(id)sender and the SKUIDPasser object that you are setting the delegate are NOT the same.
Just for a test, try calling the method [sk getSKUIDsFromCart:#"sssss"]; just after you set the delegate and you will see that it will be called because this instance has the delegate set correctly:
ViewController.m
- (void)viewDidLoad {
[super viewDidLoad];
sk = [[SKUIDPasser alloc] init];
sk.delegatePasser = self;
[sk getSKUIDsFromCart:#"sssss"];
NSLog(#"sk.delegatePasser %#",sk.delegatePasser);
}
- (void)MethodNameToCallBack:(NSString *)s
{
NSLog(#"MethodNameToCallBack %#",s);
}
Update
I updated my answer to help you call the trigger from the static library
ViewController.m
- (void)viewDidLoad {
[super viewDidLoad];
sk = [[SKUIDPasser alloc] init];
sk.delegatePasser = self;
/*
You now can pass this variable to the static library to get called
from there ...
example:
viewControllerOnStaticLibrary.passer = sk;
*/
NSLog(#"sk.delegatePasser %#",sk.delegatePasser);
}
- (void)MethodNameToCallBack:(NSString *)s
{
NSLog(#"MethodNameToCallBack %#",s);
}
Viewcontroller_in_static_library.h
#property (nonatomic, strong) SKUIDPasser *passer;
Viewcontroller_in_static_library.m
- (IBAction)CartShowEvent:(id)sender {
if (![cartBadge isHidden]) {
buyClicked = TRUE;
[self loadCart];
[self showCartItemsAll];
self.cartView.frame = self.view.bounds;
[self.view addSubview:self.cartView];
//now you are calling the same instance
[self.passer getSKUIDsFromCart:#"sssss"];
} else {
[Utilities alert:#"No products to display !!!"];
}
}
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
This question already has answers here:
Accessing Method from other Classes Objective-C
(8 answers)
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 !!