I have a big noob problem. I new in iOS and I'm trying to do this:
I have two ViewControllers. The first one has an button that if it is pushed, control goes to a second view controller.
That works but the problem is when I try to get data in my second view controller. The UITextfield doesn't work.
I'm trying to display which I insert into textfield in the label. But THE TEXTFIELD DOESN'T WORK :(
I putted the IBOutlets succesfully in the xibs and connect the buttons with their IBActions...
This is my code:
ViewController.h
#import <UIKit/UIKit.h>
#import "SecondViewController.h"
#class SecondViewController;
#interface ViewController : UIViewController
#property (strong, nonatomic) SecondViewController *secondViewController;
-(IBAction)buttonClicked:(id)sender;
#end
ViewController.m
#import "ViewController.h"
#implementation ViewController
#synthesize secondViewController;
-(IBAction)buttonClicked:(id)sender {
self.secondViewController = [[SecondViewController alloc]initWithNibName:#"SecondViewController" bundle:nil];
[self presentViewController:self.secondViewController animated:YES completion:nil];
}
SecondViewController.h
#import <UIKit/UIKit.h>
#interface SecondViewController : UIViewController {
IBOutlet UITextField *textField;
UIButton *obtener;
IBOutlet UILabel *label;
}
#property (nonatomic, retain) IBOutlet UITextField *textField;
#property (nonatomic, retain) IBOutlet UIButton *obtener;
#property (nonatomic, retain) IBOutlet UILabel *label;
-(IBAction)obtenerClicked:(id)sender;
#end
SecondViewController.m
#import "SecondViewController.h"
#implementation SecondViewController
#synthesize obtener, textField, label;
-(IBAction)obtenerClicked:(id)sender {
label.text = textField.text;
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return YES;
}
#end
In your SecondViewController.h, add this property:
#property(nonatomic, readwrite) NSString* myString;
now in firstViewController's onClick method, add this line
-(IBAction)buttonClicked:(id)sender {
//....... Previous code....
self.secondViewController.myString= #"String to be sent";
}
This will pass the string for you..
if you want to pass the string in text field, use this:
-(IBAction)buttonClicked:(id)sender {
//....... Previous code....
self.secondViewController.textField.text= #"String to be sent";
}
hope it will work fine for your requirement.
UPDATE:
Do the following to get expected results:
1. make your secondViewController a textView delegate.
in your secondViewController.h
replace #interface SecondViewController : UIViewController with #interface SecondViewController : UIViewController<UITextFieldDelegate>
put a button in your secondViewController & create an IBAction for it.
on Click event of button, write this:
self.label.text= self.textfield.text;
tell me if it does not work.
Related
I am trying yo pass data of two textfields in secondViewController to ViewController and set text of labels in ViewController.
But the delegate method for passing data is not being called. I have checked it by putting break point. Hence label text is not changing.
SecondViewController.h
#import <UIKit/UIKit.h>
#class SecondViewController;
#protocol SecondViewDelegate <NSObject>
-(void)getText1:(NSString*)str1 andText2:(NSString*)str2;
#end
#interface SecondViewController : UIViewController<UITextFieldDelegate>
#property (weak, nonatomic) IBOutlet UITextField *textField1;
#property (weak, nonatomic) IBOutlet UITextField *textField2;
#property (weak) id<SecondViewDelegate>delegate;
#end
SecondViewController.m
#import "SecondViewController.h"
#interface SecondViewController ()
#end
#implementation SecondViewController
#synthesize delegate=_delegate;
- (void)viewDidLoad {
[super viewDidLoad];
self.textField1.delegate=self;
self.textField2.delegate=self;
[self.textField1 becomeFirstResponder];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
if ( textField == self.textField1 ) { [self.textField1 resignFirstResponder]; [self.textField2 becomeFirstResponder]; }
else if ( textField == self.textField2) {
[_delegate getText1:self.textField1.text andText2:self.textField2.text];
NSLog(#"%#",self.textField1.text);
[self.navigationController popToRootViewControllerAnimated:YES];
}
return YES;
}
#end
View Controller.h
#import <UIKit/UIKit.h>
#import "SecondViewController.h"
#interface ViewController : UIViewController<SecondViewDelegate>
-(void)getText1:(NSString *)str1 andText2:(NSString *)str2;
#end
View Controller.m
#import "ViewController.h"
#interface ViewController ()
#property (weak, nonatomic) IBOutlet UILabel *label1;
#property (weak, nonatomic) IBOutlet UILabel *label2;
#end
#implementation ViewController
#synthesize label1;
#synthesize label2;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)onClick:(id)sender {
SecondViewController* sv= [[SecondViewController alloc] init];
sv.delegate=self;
[self performSegueWithIdentifier:#"moveToSecondController" sender:self];
}
-(void)getText1:(NSString *)str1 andText2:(NSString *)str2{
[label1 setText:str1];
[label2 setText:str2];
}
#end
The problem is that you've created two SecondViewController objects and made your ViewController the delegate of the wrong one.
This: [[SecondViewController alloc] init] creates an object in code. This: [self performSegueWithIdentifier:#"moveToSecondController" sender:self] creates an object from a storyboard definition.
Don't bother creating the first one, just perform the segue. Then, implement the prepareForSegue method and set your delegate there, using the destination controller (which will be the correct SecondViewController).
Try setting your delegate in prepareForSegue method like:
- (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
SecondViewController *vc = [segue destinationViewController];
vc.delegate=self;
}
}
You don't need to declare your delegate method in ViewController.h. It has already been done in SecondViewController.h as the delegate method.
import
import "SecondViewController.h"
#interface ViewController : UIViewController
// Remove this method in ViewController.h file this is call as a simple method for ViewController class
-(void)getText1:(NSString *)str1 andText2:(NSString *)str2;
#end
I am having trouble getting the keyboard to disappear after entering text. I have many solutions for previous versions of Xcode, but nothing for Xcode 7. My current ViewController.h file looks like:
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController <UITextFieldDelegate>
#property (strong, nonatomic) IBOutlet UITextField *txtUsername;
#property (strong, nonatomic) IBOutlet UITextField *txtPassword;
#end
My .m file looks like:
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize txtUsername;
#synthesize txtPassword;
- (void)viewDidLoad {
[super viewDidLoad];
self.txtUsername.delegate = self;
self.txtPassword.delegate = self;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
- (BOOL) textFieldShouldReturn:(UITextField *)textField {
[textField resignFirstResponder];
return YES;
}
#end
I have assigned the delegate from the textField to the ViewController as well.
Update The View I was working with was not assigned to the ViewController class and therefore did not inherit the textFielfShouldReturn method I needed.
Try:
[self.view endEditing:YES];
I'm currently developing an app that has three buttons at the bottom of the layout (for customization reasons I couldn't use TabBar Controller or Segmented Control).
When I click one of these buttons, a new view should show up and inherite the buttons bar, along with its state (buttons can be in selected or unselected state).
I'm completely new to iOS development, so I tried following this guide (http://www.thinkandbuild.it/working-with-custom-container-view-controllers/), but problem is when I click a button, child view doesn't show up.
ContainerViewController.h
#interface ContainerViewController : UIViewController
#property (weak, nonatomic) IBOutlet UIButton *firstButton;
#property (weak, nonatomic) IBOutlet UIButton *secondButton;
#property (weak, nonatomic) IBOutlet UIButton *thirdButton;
#property (weak, nonatomic) IBOutlet UIView *detailView;
- (IBAction)click:(id)sender;
#end
ContainerViewController.m
#import "ContainerViewController.h"
#import "FirstViewController.h"
#interface ContainerViewController ()
#property UIContainerViewController *currentDetailContainerViewController;
#end
#implementation ContainerViewController
#synthesize firstButton, secondButton, thirdButton;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)click:(id)sender
{
// switch buttons state
// ...
[self addDetailController:sender];
}
- (void)presentDetailController:(UIContainerViewController*)detailVC{
//0. Remove the current Detail View Controller showed
if(self.currentDetailContainerViewController){
[self removeCurrentDetailContainerViewController];
}
//1. Add the detail controller as child of the container
[self addChildContainerViewController:detailVC];
//2. Define the detail controller's view size
detailVC.view.frame = [self frameForDetailController];
//3. Add the Detail controller's view to the Container's detail view and save a reference to the detail View Controller
[self.detailView addSubview:detailVC.view];
self.currentDetailContainerViewController = detailVC;
//4. Complete the add flow calling the function didMoveToParentContainerViewController
[detailVC didMoveToParentContainerViewController:self];
}
- (void)removeCurrentDetailContainerViewController{
//1. Call the willMoveToParentContainerViewController with nil
// This is the last method where your detailContainerViewController can perform some operations before neing removed
[self.currentDetailContainerViewController willMoveToParentContainerViewController:nil];
//2. Remove the DetailContainerViewController's view from the Container
[self.currentDetailContainerViewController.view removeFromSuperview];
//3. Update the hierarchy"
// Automatically the method didMoveToParentContainerViewController: will be called on the detailContainerViewController)
[self.currentDetailContainerViewController removeFromParentContainerViewController];
}
- (CGRect)frameForDetailController{
CGRect detailFrame = self.detailView.bounds;
return detailFrame;
}
- (void)addDetailController:(id)sender {
FirstViewController *detailVC = [[FirstViewController alloc]initWithString:#"First view"];
[self presentDetailController:detailVC];
}
#end
FirstViewController.h
#import <UIKit/UIKit.h>
#class ContainerViewController;
#interface FirstViewController : UIViewController
#property (weak, nonatomic) IBOutlet UILabel *label;
- (id)initWithString:(NSString*)string;
#end
FirstViewController.m
#import "FirstViewController.h"
#interface FirstViewController (){
NSString *text;
}
#end
#implementation FirstViewController
- (id)initWithString:(NSString*)string {
self = [super init];
if(self){
text = string;
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.label.text = text;
}
#end
In my iOS application, I have a main View Controller with three buttons, which work like a tab bar: when I click one of the buttons, a new view controller is invoked.
I tried to implement this via container view containers, so I tried following this guide (http://www.thinkandbuild.it/working-with-custom-container-view-controllers/) and invoke the presentDetailController method in the viewDidLoad of the main controller.
Actually, no views are showed: someone can help me figuring out why? Thanks.
ViewController.h
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
#property (weak, nonatomic) IBOutlet UIButton *btnOne;
#property (weak, nonatomic) IBOutlet UIButton *btnTwo;
#property (weak, nonatomic) IBOutlet UIButton *btnThree;
#property (weak, nonatomic) IBOutlet UIView *detailView;
- (IBAction)click:(id)sender;
#end
ViewController.m
#import "ViewController.h"
#import "FirstViewController.h"
#interface ViewController ()
#property UIViewController *currentDetailViewController;
#end
#implementation ViewController
#synthesize btnOne, btnTwo, btnThree;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
FirstViewController *fvc = [[FirstViewController alloc]initWithString:#"I'm the first Controller!"];
[self presentDetailController:fvc];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)click:(id)sender
{
// button selection stuff
[self addDetailController:sender];
}
- (void)presentDetailController:(UIViewController*)detailVC{
//0. Remove the current Detail View Controller showed
if(self.currentDetailViewController){
[self removeCurrentDetailViewController];
}
//1. Add the detail controller as child of the container
[self addChildViewController:detailVC];
//2. Define the detail controller's view size
detailVC.view.frame = [self frameForDetailController];
//3. Add the Detail controller's view to the Container's detail view and save a reference to the detail View Controller
[self.detailView addSubview:detailVC.view];
self.currentDetailViewController = detailVC;
//4. Complete the add flow calling the function didMoveToParentViewController
[detailVC didMoveToParentViewController:self];
}
- (void)removeCurrentDetailViewController{
//1. Call the willMoveToParentViewController with nil
// This is the last method where your detailViewController can perform some operations before neing removed
[self.currentDetailViewController willMoveToParentViewController:nil];
//2. Remove the DetailViewController's view from the Container
[self.currentDetailViewController.view removeFromSuperview];
//3. Update the hierarchy"
// Automatically the method didMoveToParentViewController: will be called on the detailViewController)
[self.currentDetailViewController removeFromParentViewController];
}
- (CGRect)frameForDetailController{
// newFrame's height should be currentFrame's height minus buttons' height
CGRect detailFrame = CGRectMake(0, 0, self.detailView.bounds.size.width, self.detailView.bounds.size.height-self.btnOne.frame.size.height);
return detailFrame;
}
- (void)addDetailController:(id)sender {
FirstViewController *detailVC = [[FirstViewController alloc]initWithString:#"First button clicked"];
[self presentDetailController:detailVC];
}
#end
FirstViewController.h
#import <UIKit/UIKit.h>
#class ViewController;
#interface FirstViewController : UIViewController
#property (weak, nonatomic) IBOutlet UILabel *label;
#property (weak, nonatomic) IBOutlet UIButton *btnOne;
#property (weak, nonatomic) IBOutlet UIButton *btnTwo;
#property (weak, nonatomic) IBOutlet UIButton *btnThree;
- (id)initWithString:(NSString*)string;
#end
FirstViewController.m
#import "FirstViewController.h"
#interface FirstViewController (){
NSString *text;
}
#end
#implementation FirstViewController
- (id)initWithString:(NSString*)string {
self = [super init];
if(self){
text = string;
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.label.text = text;
}
#end
As part of creating FirstViewController, you are calling [super init] which produces a bare UIViewController. From your diagram, it seems as if you want to load a FirstViewController from your storyboard instead.
I suggest a sequence where you create your controller using instantiateViewControllerWithIdentifier:, then set a string property in the controller that you want to use as the label, and finally assign the string to the label when the controller's view loads.
I'm trying to separate the UITextViewDelegate methods from the main class of my project, I created a class to manage the delegate methods, but I can not change the values of the IBOulets from the main class.
I made a test project with a ViewController and a TextFieldController, in the Storyboard I add a text field and a label. What I want to do is change the text of the label when I start to write in the text field. Here is the code:
ViewController.h:
#import <UIKit/UIKit.h>
#import "TextFieldController.h"
#interface ViewController : UIViewController
#property (strong, nonatomic) IBOutlet UITextField *textField;
#property (strong, nonatomic) IBOutlet UILabel *charactersLabel;
#end
ViewController.m:
#import "ViewController.h"
#interface ViewController ()
#property (nonatomic, strong) TextFieldController *textFieldController;
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
_textFieldController = [[TextFieldController alloc] init];
_textField.delegate = _textFieldController;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
#end
TextFieldController.h:
#import <UIKit/UIKit.h>
#import "ViewController.h"
#interface TextFieldController : UIViewController <UITextFieldDelegate>
#end
Text Field Controller.m:
#import "TextFieldController.h"
#interface TextFieldController ()
#property ViewController *viewController;
#end
#implementation TextFieldController
- (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.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (BOOL) textFieldShouldBeginEditing:(UITextField *)textField {
NSLog(#"hello");
_viewController.charactersLabel.text = #"hello";
return YES;
}
#end
When I start writing in the text field the message "Hello" is printed in the log, but the text of the label does not change. I want to know how to change the label text value from the other class.
First change the TextFieldController.h like this:
#import <UIKit/UIKit.h>
#import "ViewController.h"
#interface TextFieldController : NSObject <UITextFieldDelegate>
{
}
#property (nonatomic, assign) ViewController *viewController;
#end
Then change your TextFieldController.m file like this:
#import "TextFieldController.h"
#interface TextFieldController ()
#end
#implementation TextFieldController
- (BOOL) textFieldShouldBeginEditing:(UITextField *)textField {
NSLog(#"hello");
self.viewController.charactersLabel.text = #"hello";
return YES;
}
#end
In the ViewController.m do like that:
#import "ViewController.h"
#interface ViewController ()
#property (nonatomic, strong) TextFieldController *textFieldController;
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
_textFieldController = [[TextFieldController alloc] init];
_textFieldController.viewController = self;
_textField.delegate = _textFieldController;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
#end
This will work but I personally dont like that way you took.
Good luck :)
It's failing because _viewController is nil. You need to assign the viewController property in your delegate in order to support the two way communication.
Also, I'd strongly recommend you make your delegate object a subclass of NSObject, and not UIViewController. It does nothing with controlling views. You can just manually instantiate it in your ViewController objects viewDidLoad.
In TextViewController I don't see where the viewController property (_viewController ivar) is being set so it is probably nil. You should set it when you create the TextViewController instance.
When you are navigating to other controllers using storyboad's segue then you need to implement prepareForSegue method to initialised its properties as follows
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if([segue.identifier isEqualToString:#"segue for textFieldController"])
{
TextFieldController *_textFieldController = [segue destinationViewController];
_textField.delegate = _textFieldController;
}
}
But I was wondering, why are you setting textFieldDelegate here, why can't you set in TextFieldController's viewDidLoad method as then you didn't you to implement above prepareForSegue method call?
Besides you are keeping strong reference of each other and you are creating strong retain cycle.
One more thing, following code
_textField.delegate = _textFieldController;
will not work, until textFieldController is loaded and its viewDidLoad method is being called as you are only initialising it but its outlets will not be connected until view is loaded into navigation stack.