Using a storyboard I've set up two different view controllers (A&B) where one of them (B) have a UITextView.
How can I access and change the text in the textview from View Controller A?
The code below doesn't give any errors but the text isn't set, even though the function is called correctly.
If I run [self.desc setText:text]; inside viewDidLoad in ViewControllerB it works.
ViewControllerA.h
#interface ViewControllerA : UIViewController
{
}
#end
ViewControllerA.m
#import "ViewControllerA.h"
#import "ViewControllerB.h"
#interface ViewControllerA ()
#end
#implementation ViewControllerA
- (void)viewDidLoad
{
[super viewDidLoad];
ViewControllerB *bInstance = [[ViewControllerB alloc] init];
[bInstance setDescription:#"this is some new text";
}
#end
ViewControllerB.h
#interface ViewControllerB : UIViewController
{
UITextView *desc;
}
- (void)setDescription:(NSString *) text;
#property (nonatomic, retain) IBOutlet UITextView *desc;
#end
ViewControllerB.m
#import "ViewControllerB.h"
#interface ViewControllerB ()
#end
#implementation ViewControllerB
#synthesize desc;
- (void)setDescription:(NSString *)text{
NSLog(#"called!");
[self.desc setText:text];
}
#end
You should not manipulate another view controller's views, ever. It is bad design in general, and often doesn't work at all (as you've discovered.)
Instead, set up a string property in your second view controller. Set that (in prepareForSegue, if you're using storyboards.)
Then, in your second view controller's viewWillAppear, put the string into the text field.
Do the following:
#interface ViewControllerA : UIViewController
{
UITextView *desc;
#public
ViewControllerB objB;
}
When you launch:
ObjectOfAToLaunch.objB = ObjectOfBToLaunch;
In view did load
- (void)viewDidLoad
{
[super viewDidLoad];
[Objb setDescription:#"this is some new text"];
}
Good Luck.
You can implement prepareForSegue method in the controller that launch A and B.
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Make sure your segue name in storyboard is the same as this line
if ([[segue identifier] isEqualToString:#"YOUR_SEGUE_NAME_HERE"])
{
// Get reference to the destination view controller
UIViewController *vc = [segue destinationViewController];
if ([vc isKindOfClass:ViewControllerB])
{
ObjB = vc; // ObjB is a public member you must declare in interface
if (ObjA!=nil)vc->ObjA = ObjB;
}
if ([vc isKindOfClass:ViewControllerA])
{
ObjA = vc; // ObjA is a public member you must declare in interface
if (ObjB!=nil)vc->ObjA = ObjB;
}
}
}
Good Luck.
bInstance is another instance of the class. not the same one.
Related
I'd like to trigger a message from viewController to another viewController.
And I coded like below, but viewController didn't call delegate.
I want to call delegate without stroyboard. I just want to send a message to another viewController.
viewController2.h
#protocol ViewController2Delegate;
#interface ViewController2 : UIViewController
#property (nonatomic, weak) id<ViewController2Delegate> delegate;
#end
#protocol ViewController2Delegate <NSObject>
- (void)showSomethingByDelegate;
#end
viewController2.m
#import "ViewController2.h"
#interface ViewController2 ()
#end
#implementation ViewController2
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (IBAction)buttonPressed:(id)sender {
[self.delegate showSomethingByDelegate];
}
#end
viewController.m
#import "ViewController.h"
#import "ViewController2.h"
#interface ViewController ()
<ViewController2Delegate>
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
ViewController2 *vc2 = [[ViewController2 alloc] init];
vc2.delegate = self;
}
// Below method was not called by delegate.
- (void)showSomethingByDelegate {
NSLog(#"Button Was Pressed!!!");
}
#end
well let me show an example more simple.
File: firstVC.h
/* This define the protocol object,
you can write methods required or optional the diference is when
the protocol is used in a class, xcode show you a yellow warning with required methods
like UITableViewDelegate, UITextFieldDelegate... */
#protocol firstVCDelegate <NSObject>
#required
- (void)didMessageFromOtherViewController: (NSString *)messageStr;
#optional
- (void)didOtherMessageNotRequired: (NSString *)messageStr;
#end
/* This is the definition of first UIViewController */
#interface firstViewController : UIViewController
#end
/* This is the definition of second UIViewController object with
a property that is our protocol 'firstVCDelegate' */
#interface secondViewController : UIViewController
#property (nonatomic, weak) id <firstVCDelegate> firstVCDelegate;
- (void)executeDelegateProcess;
#end
File: firstVC.m
#import "firstVC.h"
#pragma mark - First UIViewController with delegate
#interface firstViewController() <firstVCDelegate>
#end
#implementation firstViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Creating the 'secondViewController' object with delegate on this class
secondViewController *svc = [secondViewController new];
// Assign the delegate class
[svc setFirstVCDelegate: self];
// Run the delegate logic
[svc executeDelegateProcess];
}
- (void)didMessageFromOtherViewController:(NSString *)messageStr
{
// Receiving the message from the instance of our protocol in the 'secondViewController' class
NSLog(#"MESSAGE #1: %#", messageStr);
}
- (void)didOtherMessageNotRequired:(NSString *)messageStr
{
// Receiving the message in optional method
NSLog(#"MESSAGE #2: %#", messageStr);
}
#end
#pragma mark - Second UIViewController
#implementation secondViewController
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (void)setFirstVCDelegate:(id<firstVCDelegate>)firstVCDelegate
{
if (firstVCDelegate)
_firstVCDelegate = firstVCDelegate;
}
- (void)executeDelegateProcess
{
// This method is only for demo
// You can execute your delegate in the way you need to use
if (_firstVCDelegate) {
[_firstVCDelegate didMessageFromOtherViewController: #"Hello world, using the required method from secondViewController class"];
[_firstVCDelegate didOtherMessageNotRequired: #"Hello code using the optional method"];
}
}
#end
In your appDelegate.m in the method didFinishLaunchingWithOptions you can put this, and you need to #import "firstVC.h"
self.window = [[UIWindow alloc] initWithFrame: [[UIScreen mainScreen] bounds]];
self.window.autoresizesSubviews = YES;
[self.window makeKeyAndVisible];
[_window setRootViewController: [firstViewController new]];
Execute and see two logs messages, I hope I've helped :)
ViewController2 *vc2 = [[ViewController2 alloc] init];
This line of code is not doing what you think it is, this is creating a NEW instance of ViewController2 and storing it inside the variable vc2. At no point (based on your code) is this variable added to the navigation stack and displayed on screen.
Edit
Also as noticed by Holex, your vc2 variable will be removed from memory after the viewDidLoad is finished as you are not holding onto a reference of it. You would either need to create a property to hold onto it, or push it onto the navigation stack for the navigationController to hold onto it.
There are multiple ways to solve this issue:
Instead of creating a new viewController2, find a reference to the one already displayed on the screen (if it is on the screen).
If its not on the navigation stack, add vc2 to the navigation stack [self.navigationController pushViewController:vc2 animated:YES]; (assuming you have a navigation controller).
If not on the stack, and not intending to use a navigationController, present vc2 modally, such as [self presentViewController:vc2 animated:YES completion:nil];
I have a publicly declared NSString, NSString *characterString in my mainViewController.m and just before I perform a [self performSegueWithIdentifier:#"segueToFinal" sender:self]; I update this characterString with the latest data. like so:
characterString=[NSString stringWithFormat:#"final string %#",truncatedString];
[self performSegueWithIdentifier:#"segueToBlueprints" sender:self];
When the new view controller finishes appearing, the user will press a button some time that will call a method that will want the characterString and possibly other publicly declared instance variables from that previous view controller. I was trying [[mainViewController alloc]getCharacterString] (with getCharacterString being a method implemented in mainViewController) but that of course creates a new instance of mainViewController and does not solve the issue.
How Can I access the data currently in 'characterString' and other variables from the old view controller?
Keep all you global variables in you AppDelegate:
YourAppDelegate.h
#interface BTAppDelegate : UIResponder <UIApplicationDelegate>
#property (strong, nonatomic) UIWindow *window;
#property (strong, nonatomic) NSString * characterString;
#end
YourViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
YourAppDelegate* app = (YourAppDelegate*)[UIApplication sharedApplication].delegate;
app.characterString = #"Hello";
}
YourSecondViewController.m
- (IBAction)pressButton:(id)sender{
YourAppDelegate* app = (YourAppDelegate*)[UIApplication sharedApplication].delegate;
app.characterString = #"Hello2";
}
etc.
Try this out :
#interface NewVC :UIViewController
#property (nonatomic) NSString *newCharacterString;
#end
Now in the mainViewController import the NewViewController class :
#import "NewViewController.h"
.......
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
NewViewController *destinationViewController = [segue destinationViewController];
destinationViewController.newCharacterString = self.characterString;
}
and you can access the value of the character string in your NewViewController through the newCharacterString property.
HTH :)
The only thing I can think of is passing the old data from the view controller along with the segue. Or, you could even pass the entire old view controller if you have multiple properties you want to keep.
In the new VC (the one being segued to), add a property that you want to keep from the old VC (the one being segued from) such as the NSString *.
#interface NewVC :UIViewController
#property (nonatomic) NSString *newCharacterString;
#end
Then, while you are segue - ing, just pass the value to the new VC.
characterString=[NSString stringWithFormat:#"final string %#",truncatedString];
newViewControllerIWantToPassAValueTo.newCharacterString = characterString;
// passes new string forward to View Controller
[self performSegueWithIdentifier:#"segueToBlueprints" sender:self];
Why you dont pass this characterString to the secondViewController
In SecondViewController:
#interface SecondViewController:UIViewController
#property (strong, nonatomic) NSString *newCharacterString;
#end
In MainViewController:
[self performSegueWithIdentifier:#"segueToBlueprints" sender:self];
And you have to add the preparePerform Segue to MainViewController
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Make sure your segue name in storyboard is the same as this line
if ([[segue identifier] isEqualToString:#"YOUR_SEGUE_NAME_HERE"])
{
SecondViewController *vc = [segue destinationViewController];
// Pass any objects to the view controller here, like...
vc.newCharacterString = self.characterString;
}
}
And you could use newCharacterString in SecondViewController without callback to the MainViewController
I have a ViewController1 with a UILabel that can present a ViewController2 with a Modal Segue. I have a UITextField in ViewController2 that I need to access from ViewController1 so I can set my UILabel with the collected text.
I've tried working with the prepareForSegue without success. What should I do?
EDIT:
I'm using a Delegate, but I'm doing something wrong. Here's the code I'm using in ViewController2.h:
#class ViewController2;
#protocol VCProtocol
-(void)setName:(NSString *)name;
#end
#interface ViewController2 : UIViewController
#property (nonatomic, weak) id<VCProtocol> delegate;
#property (strong, nonatomic) IBOutlet UITextField *nameField;
- (IBAction)setButton:(id)sender
#end
ViewController2.m
-(IBAction)setButton:(id)sender
{
[self.delegate setName:nameField.text];
}
I conform to VCProtocol in my ViewController1.h. Then, in my ViewController1.m, I have this code:
- (void)setName:(NSString *)name
{
self.firstSignatureNameLabel.text = name;
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqual:#"Sign"])
{
ViewController2 *VC = [segue destinationViewController];
VC.delegate = self;
}
}
You can create a protocol and set VC1 as delegate of VC2, and using prepareForSegue to set VC1 as VC2's delegate should work. I know that you said it didn't work, but I can't see why. Have a try with this :
Give an identifier to your segue (on storyboard), and implement prepareForSegue as shown below :
VC2Delegate.h :
#protocol VC2Delegate
- (void)updateLabel:(NSString *)text;
#end
VC1.h :
#import "VC2Delegate.h"
#interface VC1 : UIViewController <VC2Delegate>
// All your stuff
#end
VC1.m :
- (void)updateLabel:(NSString *)text {
[_label setText:text];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([[segue identifier] isEqualToString:#"YourSegueIdentifier"]) {
VC2 * vc = [segue destinationViewController];
[vc2 setDelegate:self];
}
}
VC2.h :
#import "VC2Delegate.h"
#interface VC2 : UIViewController
#property (weak, nonatomic) id<VC2Delegate>delegate;
#end
VC2.m
- (void)textWasUpdated { // or whatever method where you detect the text has been changed
if (_delegate)
[_delegate updateLabel:[_textView text]];
}
Tell me if it works. Else, is prepareForSegue even been called ?
EDIT : Updated my answer (wasn't exactly what you needed).
But as you say it doesn't work :
Is prepareForSegue called ?
If so, is the delegate method called ?
If the delegate method isn't called, check that delegate is not nil.
You might want to remove the segue, and present it modally by yourself, using presentViewController:animated:completion:, like that :
- (IBAction)buttonWasTapped {
static NSString * const idModalView = #"modalView";
static NSString * const storyBoardName = #"MainStoryBoard"
UIStoryboard * storyboard = [UIStoryboard storyboardWithName:storyBoardName bundle:nil];
VC2 * vc = [storyboard instantiateViewControllerWithIdentifier:idModalView];
[vc setDelegate:self];
[self.navigationController presentViewController:vc2 animated:YES completion:nil];
}
When I ran into this problem, I chose the singleton approach and it works.
I have two view controllers. MainViewController pushes SignUp ViewController. Once SignUp View Controller dismisses, I need access to the same instance of MainViewController to update a UIButton.title.
.h MainView
//MainViewController.h
#import <UIKit/UIKit.h>
#interface MainViewController : UITableViewController
-(void)loggedIn;
#end
.m
#interface MainViewController ()
#end
-(void)loggedIn
{
NSLog (#"This is Logged in inside MainView.m");
self.logInOutButton.title = #"Logout";
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
UIViewController *destinationViewController = segue.destinationViewController;
Signup *signUp = [destinationViewController isKindOfClass:[SignUp class]] ? (Signup*)destinationViewController : nil;
signUp.mainViewController = self;
NSLog(#"Preapre For Segue %#", self);
}
.h SignUp
#import <UIKit/UIKit.h>
#import "MainViewController.h"
#interface SignUp : UIViewController
#property (strong, nonatomic) MainViewController *mainViewController;
#end
.m
#synthesize mainViewController;
- (void) loggedIn
{
NSLog(#" MainViewController %#", mainViewController);
[mainViewController loggedIn];
self.presentingViewController dismissViewControllerAnimated:YES completion:nil];
}
When I do NSLog I'm getting different values:
Preapre For Seg <STMainViewController: 0x9f7d600>
MainViewController (null)
Create a protocol / delegate. There are numerous resources on how to achieve this. In summary, you create the protocol on the destination viewController with the method you wish to run on the source and then you subscribe to that delegate from the source viewController.
Protocol Delegate
Dont forget to set the delegate from your prepareForSegue method
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
Signup *signUp = segue.destinationViewController;
signup.delegate = self;
NSLog(#"Preapre For Segue %#", self);
}
In a view, let's call it firstView I created a secondView as follows and pushed it if certain thing happened in the firstView:
SecondViewController *secondVC = [[secondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
[self.navigationController pushViewController:secondVC animated:YES];
[secondVC release];
Now when I'm in the secondView if let say a button is pressed I want to go back to firstView and also pass back a value from secondView to the firstView (let say an integer value of a textfield from secondView to the firstView).
Here is what I tried:
#protocol SecondViewControllerDelegate;
#import <UIKit/UIKit.h>
#import "firstViewController.h"
#interface SecondViewController : UIViewController <UITextFieldDelegate>
{
UITextField *xInput;
id <SecondViewControllerDelegate> delegate;
}
- (IBAction)useXPressed:(UIButton *)sender;
#property (assign) id <SecondViewControllerDelegate> delegate;
#property (retain) IBOutlet UITextField *xInput;
#end
#protocol SecondViewControllerDelegate
- (void)secondViewController:(SecondViewController *)sender xValue:(int)value;
#end
And in the m file
- (IBAction)useXPressed:(UIButton *)sender
{
[self.delegate secondViewController:self xValue:1234]; // 1234 is just for test
}
And then in the firstView I did:
#import "SecondViewController.h"
#interface FirstViewController : UITableViewController <SecondViewControllerDelegate> {
}
#end
And implemented:
- (void) secondViewController:(SecondViewController *)sender xValue:(int)value
{
[self.navigationController popViewControllerAnimated:YES];
}
Now, the problem is for one in FirstViewController I get the warning that "No definition of protocol "SecondViewControllerDelegate" is found, and for two the delegate method (last piece of code above) does not get invoked at all. Can somebody please tell me what's wrong?
After this line
SecondViewController *secondVC = [[secondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
Add
secondVC.delegate = self;
Also instead of
- (void) secondViewController:(SecondViewController *)sender xValue:(int)value
{
[self.navigationController popViewControllerAnimated:YES];
}
You should use
- (void) secondViewController:(SecondViewController *)sender xValue:(int)value
{
[sender popViewControllerAnimated:YES];
}
In FirstViewController .h file :
#import "SecondViewController.h"
#interface FirstViewController : UITableViewController <SecondViewControllerDelegate> {
SecondViewController *secondViewController;
}
#end
In implementation file , where you init SecondViewController instance next line assign self to delegate property :
secondViewController.delegate = self;
Next define delegate method :
- (void)secondViewController:(SecondViewController *)sender xValue:(int)value
{
NSLog ("This is a Second View Controller with value %i",value)
}
For problem 1: The #protocol definition for SecondViewControllerDelegate looks like it's in secondViewController.h; are you sure this file is imported in firstViewController.h? Otherwise it won't know about the protocol.
Problem 2: It might be totally unrelated to problem 1. Are you sure the action is hooked up properly? Can you put a NSLog() call in your useXPressed: to make sure that method is actually getting called when you expect it to?