Issues with UISplitViewController and modal UIViewControllers - objective-c

Question

I have a really strange UI glitch in my iPhone/iPad app. Because I wanted to find the cause of it, I created a new project with as little code as possible. The important code is below.
Basically, I have a UISplitViewController containing two UIViewController subclasses. When a button is tapped, the first one presents modally and as UIModalPresentationFormSheet a UIViewController subclass called Modal. In there, when a button is tapped, another UIViewController subclass called Text is presented, this time as UIModalPresentationFullScreen. In Text, there is a UITextView. When it is tapped, everything is alright, but when the iPad is rotated, I get this:
The white part is the Text view controller, the red part in the background is ViewControllerTwo.
Does anybody have any idea why this happens? And what I can do to fix it?
Here is the Project: MediaFire
Here is the relevant source code:
// AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
ViewControllerOne *one = [[ViewControllerOne alloc] init];
ViewControllerTwo *two = [[ViewControllerTwo alloc] init];
UISplitViewController *split = [[UISplitViewController alloc] init];
split.viewControllers = [NSArray arrayWithObjects:one, two, nil];
self.window.rootViewController = split;
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
// ViewControllerOne.m
#import "Modal.h"
#implementation ViewControllerOne
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor blueColor];
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(30, 30, 44, 44);
[button addTarget:self action:#selector(buttonTapped) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
- (void)buttonTapped
{
Modal *modalOne = [[Modal alloc] init];
modalOne.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentModalViewController:modalOne animated:YES];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}
// Modal.m
#import "Text.h"
#implementation Modal
- (void)viewDidLoad
{
[super viewDidLoad];
UIButton *buttonOne = [UIButton buttonWithType:UIButtonTypeRoundedRect];
buttonOne.frame = CGRectMake(30, 30, 44, 44);
buttonOne.tag = 1;
[buttonOne addTarget:self action:#selector(buttonTapped:) forControlEvents:UIControlEventTouchUpInside];
UIButton *buttonTwo = [UIButton buttonWithType:UIButtonTypeRoundedRect];
buttonTwo.frame = CGRectMake(30, 100, 44, 44);
buttonTwo.tag = 2;
[buttonTwo addTarget:self action:#selector(buttonTapped:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:buttonOne];
[self.view addSubview:buttonTwo];
}
- (void)buttonTapped:(UIButton *)button
{
if (button.tag == 1)
{
Text *text = [[Text alloc] init];
text.modalPresentationStyle = UIModalPresentationFullScreen;
[self presentModalViewController:text animated:YES];
}
else
{
[self dismissModalViewControllerAnimated:YES];
}
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}
// Text.m
#implementation Text
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor greenColor];
UITextView *textView = [[UITextView alloc] initWithFrame:self.view.bounds];
textView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self.view addSubview:textView];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}

Answer 1

You may need to present the modal views from the UISplitViewController instead of it's subviews...
UISplitViewController *splitViewController = [(AppDelegate *)[[UIApplication sharedApplication] delegate] splitViewController];
[splitViewController presentModalViewController:modal animated:YES];