Add child view controller to current view controller

Question

I am trying to add a child view controller in code, to the current view controller from storyboard by using the next code:

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle: nil]; LogInTutorialViewController *lvc = [[LogInTutorialViewController alloc] init]; lvc = (LogInTutorialViewController *)[storyboard instantiateViewControllerWithIdentifier:@"LogInTutorialViewControllerID"]; [self displayContentController:lvc];  - (void) displayContentController: (LogInTutorialViewController*) content; {      //add as childViewController     [self addChildViewController:content];     [content didMoveToParentViewController:self];     [content.view setFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];     [self.view addSubview:content.view];  } 

The view seem to be displaying on the simulator at least but in console I get a lot or error:

 <Error>: CGContextSaveGState: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context  and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. 

And also the same description but different error:

CGContextSetLineWidth, CGContextSetLineJoin, CGContextSetLineCap, CGContextSetMiterLimit, CGContextSetFlatness, CGContextAddPath, CGContextDrawPath, CGContextRestoreGState

all these error get logged twice.

Does anyone know what I am doing wrong?

also I read a few posts and in some it was suggested to alloc and init the view controller before passing the data, I also tried that without any luck.

Answer 1

why you do not try this code for adding view i think this one is simple and easy..

self.loginView = [self.storyboard instantiateViewControllerWithIdentifier:@"LOGIN"]; [self addChildViewController:self.loginView]; [self.loginView.view setFrame:CGRectMake(0.0f, 0.0f, self.contentView.frame.size.width, self.contentView.frame.size.height)]; [self.contentView addSubview:self.loginView.view]; [self.loginView didMoveToParentViewController:self];  

for further more information check this link.