Hey guys I'm a newbie developer with cocoa and I'm Trying to create a simple app. which display 4 differents pages that you can select via a tab bar.
My Problem: I made a UIButton on the First/Home page (==>FirstView.xib) with IB and i tried to link it to my second page (==>SecondView.xib) with some code found on the net.
The thing is that i can build my code but nothing happens when I try to click on my button, can you help me ?
Code for FirstView.h:
#import <UIKit/UIKit.h>
#interface FirstViewController : UIViewController {
UIButton *button;}
#property (nonatomic, retain) IBOutlet UIButton *button;
- (IBAction)goToViewTwo;
#end
Code for FirstView.m:
#implementation FirstViewController
#synthesize button;
- (IBAction)goToViewTwo {
SecondViewController *SecondView= [[SecondViewController alloc] initWithNibName: #"SecondView" bundle:[NSBundle mainBundle]];
[self.navigationController pushViewController:SecondView animated:YES];
}
- (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.
}
- (void)dealloc {
[super dealloc];
[button release];
}
#end
About the outlets in FIrstVIew.xib:
I linked "Touch Up Inside" to "goToViewTwo" and "b^utton" to "File's Owner'
I'm under the impression this is in a tab bar where each tab bar button displays a .xib file. If this is the case, the solution is fairly simple. Your tabBarController manages your views in an array of view controllers. To switch between them, your IBAction method should be the following:
- (IBAction)goToViewTwo {
self.tabBarController.selectedIndex = 1;
}
This tells your tab bar controller to switch from your current view controller (at index 0) to the second (at index 1)
Related
I'm trying to make a button take me to a new UIViewController based on the content of a textField, but when I run it and hit the button (with the right condition in the text field to take me to the new UIViewController), the screen blacks out. This is what I wrote in my .h and .m files. Can anyone help me (Im using storyboards)
#interface ViewController : UIViewController
- (IBAction)boton:(id)sender;
#property (strong, nonatomic) IBOutlet UITextField *texto;
#end
#import "ViewController.h"
#import "ViewController2.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize texto;
- (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)boton:(id)sender {
if ([texto.text isEqualToString:#"1"]) {
ViewController2 *vc1=[[ViewController2 alloc]init];
[self presentViewController:vc1 animated:YES completion:nil];
}
}
#end
As you say the screen is blacking out, I expect your viewController is getting initialised without a view.
To initialise with a view hierarchy from a xib(nib) file:
- (id)initWithNibName:(NSString *)nibName bundle:(NSBundle *)nibBundle
where nibName can be nil if it shares it's name with the View Controller, and nibBundle can be nil it the nib is in the main bundle.
i.e....
ViewController2 *vc2;
vc2 = [[ViewController2 alloc] initWithNibName:nil
bundle:nil];
where the xib file is named ViewController2.xib
To initialise from a storyboard:
UIStoryboard *storyboard = self.storyboard;
vc2 = [storyboard instantiateViewControllerWithIdentifier:#"ViewController2"];
(you need to set up a viewController in storyboard and give it a matching identifier)
To initialise with neither storyboard or xib, you should override your view controller's - (void)loadView, create a view and assign it to self.view.
Update
In answer to your comment - the UIStoryboard... and ViewController2 *vc2= ... code would go into your button code (in your case it you would replace / adapt the line containing vc1=.... It would look like this:
- (IBAction)boton:(id)sender {
if ([texto.text isEqualToString:#"1"]) {
ViewController2 *vc2;
UIStoryboard *storyboard = self.storyboard;
vc2 = [storyboard instantiateViewControllerWithIdentifier:#"ViewController2"];
[self presentViewController:vc2 animated:YES completion:nil];
}
You will need to have created a storyboard scene in your storyboard with a viewController whose custom class is ViewController2 and identifier is "ViewController2". The identifier name is arbitrary, but must match the identifier string you use in your code.
As you are using storyboards, an alternative way to do this is to create a modal segue from the 'ViewController' scene to a 'ViewController2' scene, give it an identifier, and use performSegueWithIdentifier in your button method.
I am using a single view application template in xcode. I created the first view controller, and then added another with a new .m and .h and xib.
I can click a button IBAction, and get to my second view, however the code I am using for the "back" button wont take me back to my first view, everything crashes. I have included my code which seems to follow the tutorial I was using. Additionally I just control clicked my button and dragged the line to my IBAction in the .h to hook in the secondViewController buttons, which is what I did on the first view controller and it seems to work there.
If anyone can help that would be great!
//from my first view controller .h which works
-(IBAction) buttonPressedPayTable: (id) sender;
//from my first view controller.m which also works and gets me to the second view
-(IBAction) buttonPressedPayTable: (id) sender
{
SecondViewController *payTableView = [[SecondViewController alloc]
initWithNibName:#"SecondViewController" bundle:nil];
[self.view addSubview:payTableView.view];
}
//from my second view controller .h that will not get me back to the first view without crashing
#import <UIKit/UIKit.h>
#interface SecondViewController : UIViewController
{
}
-(IBAction) back: (id)sender;
#end
//from my second view controller .m which doesn't seem to work
#import "SecondViewController.h"
#implementation SecondViewController
-(IBAction) back: (id)sender
{
[self.view removeFromSuperview];
}
#end
use UINavigation controller
[self.navigationController popViewControllerAnimated:YES];
You might be better off using modal views. So instead of addSubView use:
[payTableView setModalPresentationStyle:UIModalPresentationFullScreen];
[payTableView setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];
[self presentModalViewController:payTableView animated:YES];
Then on the seconViewController back method:
[self dismissModalViewControllerAnimated:YES];
You can change the ModalTransitionStyle to the few that apple gives you :D
Hope this helps
You can use a navigation method for switching from one view controller to the other.
See the apple docs about view controllers
Don't add your second ViewController as a subview of the view.
Use a UINavigationController to add the new UIViewController to the view stack using [self.navigationController pushViewController:payTableView animated:YES];
Then you can either use the nav controllers back button, or use your own button with the code [self.navigationController popViewControllerAnimated:YES];
Alternately, you can use Storyboards and use a simple segue.
[payTableView.view removeFromSuperview];
i think you are removing the whole view .that is why app is crashing
You need to use delegate here:
in .h of first view declare a member variable :
#interface FirstViewControllerClassName: UIViewController
{
SecondViewController *payTableView;
}
#property (nonatomic, retain) SecondViewController *payTableView;
in .m :
#synthesize payTableView;
-(IBAction) buttonPressedPayTable: (id) sender
{
if (!payTableView)
payTableView = [[SecondViewController alloc]
initWithNibName:#"SecondViewController" bundle:nil];
payTableView.delegate = self;
payTableView.isFinishedSelector = #selector(removeView);
[self.view addSubview:payTableView.view];
}
- (void)removeView
{
[payTableView.view removeFromSuperview];
[payTableView release];
payTableView = nil;
}
//Just declare a member variable delegate in secondviewcontroller like:
#import <UIKit/UIKit.h>
#interface SecondViewController : UIViewController
{
id delegate;
SEL isFinishedSelector;
}
#property (nonatomic, assign) id delegate;
#property (nonatomic, assign) SEL isFinishedSelector;
-(IBAction) back: (id)sender;
#end
#import "SecondViewController.h"
#implementation SecondViewController
#synthesize delegate;
#synthesize isFinishedSelector;
-(IBAction) back: (id)sender
{
if ([self.delegate respondsToSelector:isFinishedSelector])
[self.delegate performSelector:isFinishedSelector];
}
#end
How do you add a navigation controller on a newly created view controller? i've search everywhere but all the tutorials are from creating a navigation controller project.
Anyone can lead mo to a tutorial that creates a navigation controller using a view controller subclass?
What i'm doing so far:
I created a UIViewController Project, and i have something like this to go to another view controller, with a navigation controller.
NavController *view=[[NavController alloc] initWithNibName:nil bundle:nil];
view.modalTransitionStyle=UIModalTransitionStyleCrossDissolve;
[self presentModalViewController:view animated:YES];
[view release];
Added a new view controller subclass.
Add > New File > UIViewController subclass with nib
on NavController.h
#import <UIKit/UIKit.h>
#interface NavController : UIViewController {
IBOutlet UIWindow *window;
IBOutlet UINavigationController *navCon;
}
#property (nonatomic, retain) UIWindow *window;
#property (nonatomic, retain) UINavigationController *navCon;
#end
on NavController.m
#import "NavController.h"
#implementation NavController
#synthesize window,navCon;
- (void)viewDidUnload {
[super viewDidUnload];
}
- (void)dealloc {
[window release];
[navCon release];
[super dealloc];
}
#end
i already dragged a Navigation Conrtoller and a Window on my IB, and connected window to window and the Navigation Controller to navcon outlets, but whats next?
If you're using the storyboards select your view controller then in top menu choose "editor" / "embed in" / "navigation controller".
Normally, you have to create an Navigationcontroller object inside your Appdelegate.h (like the existing window object). After that you import the h.File of a ViewController into the Appdelegate.m and init it like in the following example the menuviewcontroller.
stackoverflow
To call another view use following lines of code, so the navigationcontroller will handle everything for you.
#import Viewcontroller
ViewControllerName controllerVarName = [ViewControllerName alloc] init];
[self.navigationcontroller pushViewController:_ViewControllerName animated:YES];
Inside your specific ViewController use this line to set the title the Navigationcontroller will use:
self.title = #"titleName";
So I've a button with a IBAction heading to another ViewController by its initWithNibName method. Everything is embedded in a NavigationController.
I also created a .xib for this ViewController, here is a quick screenshot :
Here is my code :
.h
#interface ModeEmploiController : UIViewController
{
IBOutlet UIScrollView *scrollView;
UITextView *vueOffres, *vueInfos, *vueGrilles;
}
#property (nonatomic, retain) IBOutlet UIScrollView *scrollView;
.m
#implementation ModeEmploiController
#synthesize scrollView;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self)
{
[scrollView setScrollEnabled:YES];
[scrollView setContentSize:CGSizeMake(320, 529)];
// Here I define vueOffres, vueInfos and vueGrilles and for each of them :
[self.view addSubview:vueGrilles/vueInfos/vueOffres];
}
}
But when I run my app, my scroll isn't enabled and I don't have the navigation bar of my navigation controller. What's happening?
add another view inside the ScrollView i called mine content view. the do
self.scrollView.contentSize = self.contentView.frame.size;
for the navigation bar you need to have a uinavigation controller and make your controller the rootviewcontroller of the navigation controller. like this
-(IBAction)MyButton:(id)sender
{
MyViewController *controller = [[MyViewController alloc] initWithNibName:#"MyView" bundle:nil];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:controller];
[self.navigationController presentModalViewController:navController animated:YES];
}
Remove your ModeEmploiController from xib, but keep its child View and ScrollView.
now click on File's Owner and put ModeEmploiController from Identity inspector in right panel.
Now right click on File's Owner and connect property of view to View and scrollView to ScrollView.
Your initialization code is in the wrong method.
Since you are using Storyboards, your view controller is being unarchived from a nib file. The correct place to initialize the controls is in the awakeFromNib method.
Make sure that you have set up an IBOutlet property for your scroll view and hooked it up in the Storyboard, and then:
- (void)awakeFromNib {
[self.scrollView setScrollEnabled:YES];
[self.scrollView setContentSize:CGSizeMake(320, 529)];
// Here I define vueOffres, vueInfos and vueGrilles and for each of them :
[self.view addSubview:vueGrilles/vueInfos/vueOffres];
}
That just leaves the problem of the subview that you are adding. What is vueGrilles/vueInfos/vueOffres? You should create this view properly within the viewDidLoad method and add it as a subview there instead of in this initialiser.
I'm sure I'm overlooking the obvious as I've got countless working buttons...but...for whatever reason this one is not cooperating...
I've added a UIButton (Rounded Rect) to a UIView subclass (DialogView) which is a subview of my view controller's view. This subview is created almost entirely in IB. I've wired up the button to (IBAction)okButtonPressed:(id)sender in IB to Touch Up Inside and created a corresponding method in DialogView. However when I "touch" this button it doesn't trigger the method. userInteractionEnabled is true for the VC's view, DialogView and the UIButton.
Thinking maybe initWithCoder had to do some frame manipulation or something I added the following which successfully logs to console.
- (id)initWithCoder:(NSCoder *)decoder {
if (self = [super initWithCoder:decoder]) {
NSLog(#"DialogView initWithCoder called");
}
return self;
}
In further exploration I wired up an IBOutlet to the button and then if I try to change the titleLabel from the view controller I notice that it get's severely truncated. Default text of say "Press Me!" set in IB displays fine when view is first drawn. But if I change the text...
self.DialogView.okButton.titleLabel.text = #"Not Working";
...it gets truncated to "N..."
Dunno if this is related. Probably...
Anyone see what I've screwed up here?
Edit (adding code related to showing UIButton):
From the View Controller:
self.DialogView = [[[NSBundle mainBundle] loadNibNamed:#"DialogView" owner:self options:nil] objectAtIndex:0];;
self.DialogView.myVC = self;
self.DialogView.backgroundColor = [UIColor clearColor];
self.DialogView.center = CGPointMake(self.view.frame.size.width / 2, self.view.frame.size.height / 2);
self.DialogView.nameLabel.text = loan.fullName;
self.DialogView.noteLabel.text = loan.summaryOfLoan;
self.DialogView.amountLabel.text = [currencyFormatter stringFromNumber:loan.originalAmount];
self.DialogView.alpha = 0.0;
[self.view addSubview:DialogView];
The UILabels all displaying as expected. As is the problem UIButton. I can see it I just can't interact with it!?!
DialogView's interface:
#class MyViewController;
#interface DialogView : UIView {
IBOutlet UILabel *nameLabel, *noteLabel, *amountLabel;
IBOutlet UIImageView *arrowView;
IBOutlet UIButton *okButton;
MyViewController *myVC;
}
#property (nonatomic, retain) UILabel *nameLabel, *noteLabel, *amountLabel;
#property (nonatomic, retain) UIImageView *arrowView;
#property (nonatomic, assign) MyViewController *myVC;
#property (nonatomic, retain) UIButton *okButton;
- (IBAction)okButtonPressed:(id)sender;
#end
And DialogView's implementation:
#import "DialogView.h"
#import "MyViewController.h"
#implementation DialogView
#synthesize nameLabel, noteLabel, amountLabel, arrowView, okButton;
#synthesize myVC;
- (void)dealloc {
[nameLabel release];
[noteLabel release];
[amountLabel release];
[arrowView release];
[okButton release];
[super dealloc];
}
- (id)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
// Initialization code
}
return self;
}
- (id)initWithCoder:(NSCoder *)decoder {
if (self = [super initWithCoder:decoder]) {
NSLog(#"DialogView initWithCoder called");
}
return self;
}
- (IBAction)okButtonPressed:(id)sender {
NSLog(#"pressed DialogView OK button");
[self.myVC.navigationController popViewControllerAnimated:YES];
}
- (void)drawRect:(CGRect)rect {
// Drawing code
}
#end
I thought that we should use -setTitle:forState: in order to set button's title ?
An other thought, did you check that the button's frame is not CGRectZero ? And by the way, all the frames for the view in the hierarchy ? And check that one superview in the hierarchy is not user interaction disabled ?
And, I think imageView does not respond to touches, do you have one in your code ?
I was just having more or less the same problem and I found that my containing view did not have "User Interaction Enabled".
Hope this helps.
Do you maybe have two buttons on top of one another? Change the IB project window to the detail view and see if your view has more buttons than you are expecting. Maybe you've wired up a button that's not actually getting the press you're expecting.