Closed NSWindow shows up when NSSavePanel is presented (osx cocoa)

Question

I have wrote an OSX storyboard application that has a splash screen. It is a NSWindow with NSWindowController, without subclassing, that have a SplashViewController that subclasses NSViewController.

Here is the code of SplashViewController:

- (void)viewDidLoad {
    [super viewDidLoad];

    _timer = [NSTimer scheduledTimerWithTimeInterval:5 target:self selector:@selector(timeOut) userInfo:nil repeats:NO];
}

- (void)timeOut
{
    [self performSegueWithIdentifier:@"main" sender:self];
}

- (void)prepareForSegue:(NSStoryboardSegue *)segue sender:(id)sender
{
    [_timer invalidate];
     _timer = nil;

    [self.view.window.windowController close];
}

This closes the window/window controller as expected.

The segue has show type and presents another NSWindowController which has MainViewController, subclass of NSViewController. When MainViewController opens a save dialog:

NSArray *a = [[NSApplication sharedApplication] windows];
NSLog(@"%ld", a.count);

NSSavePanel *savePanel = [NSSavePanel savePanel];
[savePanel setAllowedFileTypes:@[@"pdf"]];
[savePanel setDirectoryURL:[NSURL URLWithString:NSHomeDirectory()]];
[savePanel beginSheetModalForWindow:self.view.window completionHandler:nil];

an old splash window comes up (and "1" is printed). What the? I mean why it is showing up? And what NSSavePanel has to do with it?

score 0 · Answer 1 · edited May 23 '17 at 12:06

Thanks to this answer (although partially unrelated) I managed to make it work.

Looks like there are several bugs when using storyboard (I am using XCode 6.3.1). In order to fix Them, you need to:

Select your initial window controller and uncheck "Is Initial Controller" (i.e. there is no initial controller set for the storyboard).
Your main window controller should be subclassed, even if subclass is empty.
Set Storyboard ID of your main window controller to Main (if you omit previous step, Storyboard ID be erased as soon as you leave storyboard, first bug).

In your AppDelegate.m add the following code:

@property (strong, nonatomic) NSWindowController *mainWindowController;

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    [NSApp activateIgnoringOtherApps:YES];

    NSStoryboard *storyboard = [NSStoryboard storyboardWithName:@"Main" bundle:nil];
    NSWindowController *main = [storyboard instantiateControllerWithIdentifier:@"Main"];
    [main showWindow:self];
    [main.window makeKeyAndOrderFront:self];

    // Important! Should be strong to retain instance. Second bug. 
    // If you don't do that, your window will open and close right away.
    _mainWindowController = main; 
}

Closed NSWindow shows up when NSSavePanel is presented (osx cocoa)

1 Answers1