I'm quite new to Objective-C. I want to go to another view controller but it shows me only the black screen after the button click. Is there something that I'm missing here?
Here is my code:
- (IBAction)measuring1stscan:(id)sender {
measuringscan *second = [[measuringscan alloc]initWithNibName:nil bundle:nil];
[self presentViewController:second animated:NO completion:NULL];
}
*measuringscan is the name for another view controller
viewConreoller default is no color, it is black. just add second.view.backgroundColor = [UIColor redColor];
- (IBAction)measuring1stscan:(id)sender {
measuringscan *second = [[measuringscan alloc] init];
second.view.backgroundColor = [UIColor redColor];
[self presentViewController:second animated:NO completion:NULL];
}
#rose is right try to give different color and then check.
Still you face same issue then try to run below code.
Embadded viewcontroller into navigation controller and give unique identifier to second viewcontroller.
- (IBAction)measuring1stscan:(id)sender
{
UIStoryboard *st = [UIStoryboard storyboardWithName:[NSString stringWithFormat:#"StoryboardWithName"] bundle:NULL];
measuringscan *second = [st instantiateViewControllerWithIdentifier:#"viewcontrollerIdentifier"];
[self.navigationController pushViewController:second animated:YES];
}
If you are using storyboard then use following
measuringscan *controller = [self.storyboard instantiateViewControllerWithIdentifier:#"StoryboardIdentifier"];
[self presentViewController:controller animated:YES completion:nil];
or
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:[NSString stringWithFormat:#"StoryboardName"] bundle:nil];
measuringscan *controller = [storyboard instantiateViewControllerWithIdentifier:#"viewcontroller'sIdentifier"];
[self presentViewController:controller animated:YES completion:nil];
And if you aren't using storyboard instead you are using xib's then use following
measuringscan *controller = [[measuringscan alloc] initWithNibName:nil bundle:nil];
[self presentViewController:controller animated:YES completion:nil];
Points to remember (as said by #rmaddy)
Class name should be start with capital letter
Variable name should start with small letter
It is the naming convention that should be followed by a developer.
For more details click here
Related
I'm using UINavigation and UIPageView controller in a UIViewController. I have 3 buttons and here is my code :
- (IBAction)StartButtonClicked:(id)sender {
NSLog(#"start button pressed");
[_Timer invalidate];
_Timer = nil;
dispatch_async(dispatch_get_main_queue(), ^{
UIStoryboard* storyboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
CardViewController* controller = [storyboard instantiateViewControllerWithIdentifier:#"CardViewController"];
[self.navigationController pushViewController:controller animated:NO];
}
}
- (void)pageViewController {
self.pvc = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
self.pvc.view.frame = self.view.bounds;
[self.view addSubview:self.pvc.view];
[self.pvc setViewControllers:#[[viewControllerArray1 objectAtIndex:0]] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];
}
- (IBAction)rightButtonPressed:(id)sender {
[self pageViewController];
[self.pvc setViewControllers:#[[viewControllerArray1 objectAtIndex:1]] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];
}
- (IBAction)leftButtonPressed:(id)sender {
[self pageViewController];
[self.pvc setViewControllers:#[[viewControllerArray1 objectAtIndex:2]] direction:UIPageViewControllerNavigationDirectionReverse animated:YES completion:nil];
}
When I click on right button and came back to this view controller my start button's push view not working.
Please check the answer .
iOS - Push viewController from code and storyboard
Don't initialize Storyboard always,
UIStoryboard* storyboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
You can set the rootViewController from the UtoryBoard itself.
Set initialViewController as a UINavigationController and Set the FirstViewController as RootViewController.
Edit :
For Push use the below code,
CardViewController* controller = [storyboard instantiateViewControllerWithIdentifier:#"CardViewController"];
[self.navigationController pushViewController:controller animated:NO];
and Back. If use the default backButton not need to write any code.
If use are using custom backButton,
[self.navigationController popViewController];
Check 2 things,
Your storyboard identifier is correct.
The root view have navigation Controller.
Your StoryBoard should be like this,
I wanted to populate my uncontrolled view as presentViewController on my app, but it does not work. I do not want to cover the entire screen. Like on the iPad, it should view at the centre and frame, which is preferred.
Below is my code which covers the entire screen:
MyView *testview = [[MyView alloc]init];
testview.modalPresentationStyle = UIModalPresentationFormSheet;
testview.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentViewController: testview animated:YES completion:nil];
I do not want to push my UIViewController...
You cannot present a View. You must present a controller. for example:
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:#"Main" bundle: nil];
MyViewController* vc = [mainStoryboard instantiateViewControllerWithIdentifier:#"MY_CTL_ID"];
[self presentViewController:vc animated:NO completion:nil];
Here's what worked for me (iOS 9 or later):
MyViewController *testVC = [[MyViewController alloc] init];
testVC.modalPresentationStyle = UIModalPresentationFormSheet;
testVC.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
// Both of these are necessary to make it present as a form sheet on an iPhone/iPod.
testVC.presentationController.delegate = vc;
testVC.presentationController.overrideTraitCollection = [UITraitCollection traitCollectionWithTraitsFromCollections:#[[UITraitCollection traitCollectionWithUserInterfaceIdiom:UIUserInterfaceIdiomPad]]];
// Set the size if you don't set it elsewhere.
testVC.preferredContentSize = CGSizeMake(270, 130);
[self presentViewController:vc animated:YES completion:nil];
Also, the view controller you are presenting needs implement the UIAdaptivePresentationControllerDelegate protocol:
#interface MyViewController () <UIAdaptivePresentationControllerDelegate>
...
#end
#implementation MyViewController
...
(UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller traitCollection:(UITraitCollection *)traitCollection {
// This makes it use the presentation style that was set when it was presented.
return UIModalPresentationNone;
}
...
#end
How can I make a Method display a new ViewController? I am trying to make the
Currently what I have :
-(void)gameOver{
[groundMovement invalidate];
[guyMovement invalidate];
topGround.hidden = YES;
bottomGround.hidden = YES;
guy.hidden = YES;
scoreLabel.hidden = YES;
gameViewController *viewController = [[UIStoryboard storyboardWithName:#"gameOver" bundle:nil] instantiateViewControllerWithIdentifier:#"gameOverViewController"];
[self presentViewController:viewController animated:YES completion:nil];
if (score > highScore) {
[[NSUserDefaults standardUserDefaults] setInteger:score forKey:#"HighScoreSaved"];
}
}
-(void)terminate{
MyNewViewController *myNewVC = [[MyNewViewController alloc] init];
// do any setup you need for myNewVC
[self presentModalViewController:myNewVC animated:YES];
}
Since your are using storyboards in your project, first make sure that your view controllers have a storyboard identifier. You can set it through the identity inspector in xCode. Then, you can instantiate a new view controller by calling:
YourViewControllerClass *viewController = [[UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil] instantiateViewControllerWithIdentifier:#"ViewControllerId"]; // Replace "MainStoryboard" and "ViewControllerId" with your storyboard name and the storyboard id for your view controller respectively
Then, depending on how your needs you can either push the new view controller (if for example you're using a navigation controller):
[self.navigationController pushViewController:viewController animated:YES];
or present it modally
[self presentViewController:viewController animated:YES completion:nil];
Every time that I press the button activating the action above, my screen goes black.
I just want pass to another view (or same) without using the model proposed by storyboard.
What's wrong?
Thanks
- (IBAction)goToView:(id)sender {
ViewController *controller = [[ViewController alloc] initWithNibName:nil bundle:nil];
[self presentViewController:controller animated:YES completion:nil];
You haven't configured your controller's view.
For example try this just before you presentViewController...
controller.view.backgroundColor = [UIColor orangeColor];
Your screen will turn orange...
Full example:
- (IBAction)goToView:(id)sender {
ViewController *controller = [[ViewController alloc]
initWithNibName:nil bundle:nil];
controller.view.backgroundColor = [UIColor orangeColor];
[self presentViewController:controller animated:YES completion:nil];
}
I have seen the abundance of threads on this issue - I have tried all those solutions and they have failed. The build that ran, when I click the button it goes to the thread debugger page and I have no clue as to whats going on.
I need to go from a new class with its own .xib to the MainStoryboard where FirstViewController is.
- (IBAction)backToHome:(id)sender {
/*
FirstViewController *fvc = [[FirstViewController alloc] initWithNibName:nil bundle:nil];
[self presentViewController:fvc animated:YES completion:nil];
*/
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil];
FirstViewController *fvc = [storyboard instantiateViewControllerWithIdentifier:#"FirstViewController"];
[self presentViewController:fvc animated:YES completion:nil];
}
When using the commented code it goes to a black screen
FirstViewController *fvc = [[FirstViewController alloc] initWithNibName:nil bundle:nil];
[self presentViewController:fvc animated:YES completion:nil];
Here initWithNibName:nil causes black screen as it is not able to load nib.
i think you should add name
FirstViewController *fvc = [[FirstViewController alloc] initWithNibName:#"somethinghere" bundle:nil]; [self presentViewController:fvc animated:YES completion:nil];