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";
Related
I'm an iOS developer and I want to create a simple desktop app. I thought the switch would go perfect but it doesn't.
I've created a cocoa app ( from the xCode template ). Now I don't want to use user interface builders and stuff so I wrote my first controller like this:
#interface MainViewController ()
#property (nonatomic, strong) NSTextView *test;
#end
#implementation MainViewController
-(instancetype) init
{
self = [super init];
if(self)
{
NSLog(#"%s", __PRETTY_FUNCTION__);
_test = [[NSTextView alloc] init];
[_test setString:#"DKDDK"];
[self.view addSubview:_test];
[_test mas_makeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(self.view);
}];
}
return self;
}
#interface MainViewController : NSViewController
#end
And I just use the NSWindow that is created by the template:
#interface AppDelegate ()
#property (weak) IBOutlet NSWindow *window;
#end
#implementation AppDelegate
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
// Insert code here to initialize your application
MainViewController * mainView = [[MainViewController alloc] init];
[self.window.contentView addSubview:mainView.view];
mainView.view.frame = ((NSView*)self.window.contentView).bounds;
}
When I run the application it gives me:
[NSViewController loadView] loaded the "(null)" nib but no view was set.
I don't know how to solve this. How can I create an app without nib, just like you do on iOS?
If you aren't loading the view from a NIB then there is little need for a view controller.
Discard the view controller and subclass NSView instead, and set that as the window's content view.
Note: you are making a rod for your own back by not using IB.
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
I have a view controller, MainViewController in which I have a UIButton as an IBOutlet that is connected up in Interface Builder
In the header I have
#interface MainViewController : UIViewController
{
SettingsViewController *settingsViewController;
UIButton *leftTextButton;
}
#property (nonatomic, retain) IBOutlet UIButton *leftTextButton;
in the .m I have synthesised the property
#synthesize leftTextButton;
I then add a settings subview as follows
SettingsViewController *settingsViewController = [[SettingsViewController alloc] initWithNibName:#"SettingsViewController"
bundle:nil];
[self.view.superview addSubview:settingsViewController.view];
Within the SettingsViewController I then try to update the title of the UIButton *leftTextButton in the parent view
[ ((MainViewController*) self.parentViewController).leftTextButton setTitle:#"Ahhhhh !!" forState:UIControlStateNormal];
Although this doesn't crash it doesn't work - the title of the button does not change.
Any help would be greatly appreciated
The parentViewController property is nil unless the view controller is presented modally, or is under a UINavigationController or a UITabBarController.
Give your SettingsViewController a mainViewController property:
#interface SettingsViewController
...
#property (assign) MainViewController *mainViewController;
Set it when you create the SettingsViewController:
SettingsViewController *settingsViewController = [[SettingsViewController alloc] initWithNibName:#"SettingsViewController" bundle:nil];
settingsViewController.mainViewController = self;
Then you can use it to update the button title:
[self.mainViewController.leftTextButton setTitle:#"Ahhhhh !!" forState:UIControlStateNormal];
If you just add the view controller's view in the parent view, the view controller will have no idea of its parent view controller, thus the parentViewController property is nil. You also have to add your SettingsViewController to your MainViewController via addChildViewController: and then notify the SettingsViewController via didMoveToParentViewController: that you have created this hierarchy. Then you should be able to access the parentViewController.
(Note: this is for iOS 5 only, if you're still on iOS 4 see rob mayoff's reply)
Like many others I started to code an experiment today where I would have two view controllers and be able to switch between them. I got this to work using a navigation controller, but I have a question about the implementation.
In my TwoViewsAppDelegate, I define the navigation controller and the rootViewController.
#interface TwoViewsAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
UINavigationController *navigationController;
RootViewController *rootViewController;
}
and set them up as follows:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
rootViewController = [[RootViewController alloc] init];
navigationController = [[UINavigationController alloc] initWithRootViewController:rootViewController];
[window setRootViewController:navigationController];
[self.window makeKeyAndVisible];
return YES;
}
Then in my rootViewController, I define the level2ViewController that I
am going to switch to, and a button that I'm going to press to make the
switch happen:
#interface RootViewController : UIViewController {
UIButton *theButton;
Level2ViewController *level2ViewController;
}
Here's the response to the button being pressed in RootViewController.m:
-(void)level1ButtonPressed:(id)sender
{
if (level2ViewController == nil)
{
level2ViewController = [[Level2ViewController alloc] init];
}
[self.navigationController pushViewController:level2ViewController animated:YES];
}
The problem is that if there was going to be a level3ViewController,
it would have to be defined as a member of level2ViewController, etc.
for however many view controllers i wanted to push onto the stack.
It would be nice to be able to define all the view controllers in one
place, preferably the app Delegate. Is this possible?
To solve this, you can create a callback-type method which uses the delegate of the class that'll be sending the requests for the view controllers. Best explained through code...
RootViewController.h
#import "RootInterfaceView.h"
// all the other VC imports here too
#interface RootViewController : UIViewController <RootInterfaceViewDelegate>
{
RootInterfaceView *interface;
}
RootViewController.m
-(void)rootInterfaceView: (RootInterfaceView*)rootInterfaceView didSelectItem:(NSUInteger)itemTag
{
switch (itemTag)
// then create the matching view controller
}
RootInterfaceView.h
// imports here if required
#protocol RootInterfaceViewDelegate;
#interface RootInterfaceView : UIView <RootInterfaceItemViewDelegate>
{
id <RootInterfaceViewDelegate> delegate;
}
#property (nonatomic, assign) id delegate;
#end
#protocol RootInterfaceViewDelegate <NSObject>
#optional
-(void)rootInterfaceView: (RootInterfaceView*)rootInterfaceView didSelectItem:(NSUInteger)itemTag;
#end
RootInterfaceView.m
// remember to synthesize the delegate
-(void)rootInterfaceItemSelected: (RootInterfaceItemView*)rootInterfaceItemView
{
NSUInteger theTag = rootInterfaceItemView.tag;
if ([self.delegate respondsToSelector:#selector(rootInterfaceView:didSelectItem:)])
[self.delegate rootInterfaceView:self didSelectItem:theTag];
}
Alternatively, if the only options from level 2 were either back to root/pop one VC or to push controller 3, then it'd be fine for level 2 to be importing 3 to allow for it's creation.