I’m trying to make usage of Cocoa UI preservation API, but it seems I got stuck
at the very beginning and even after almost two hours of trying to figure out
what I’m doing wrong, there’s no progress at all. I’m sensing I’m missing
something obvious, but I don’t know what that would be.
Anyhow, I’ve created a very simple single window application, with (main)
window, controlled by its accompanying (main) window controller. The
controller implementation is fairly simple:
@implementation MainWindowController
- (instancetype)init
{
self = [super initWithWindowNibName:@"MainWindow" owner:self];
if (self)
{
// Some code here.
}
return self;
}
- (void)windowDidLoad
{
[super windowDidLoad];
// Some code here.
}
@end
The application delegate is responsible for preservation and it’s implemented
exactly like in many examples I’ve found online, as well as in Apple
documentation:
@interface AppDelegate ()
@property (nonatomic, strong) NSWindowController *mainWindowController;
@end
@implementation AppDelegate
+ (void)restoreWindowWithIdentifier:(NSString *)anIdentifier
state:(NSCoder *)aState
completionHandler:(void (^)(NSWindow *, NSError
*))aCompletionHandler
{
NSWindow *window;
if ([anIdentifier isEqualToString:@"main window"])
{
AppDelegate *delegate = [NSApp delegate];
window = [[delegate mainWindowController] window];
}
aCompletionHandler(window, nil);
}
- (NSWindowController *)mainWindowController
{
if (!_mainWindowController)
{
_mainWindowController = [[MainWindowController alloc] init];
[[_mainWindowController window] setRestorable:YES];
[[_mainWindowController window] setIdentifier:@"main window"];
[[_mainWindowController window] setRestorationClass:[self class]];
}
return _mainWindowController;
}
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
[[self mainWindowController] showWindow:self];
}
- (void)applicationWillTerminate:(NSNotification *)aNotification
{
}
@end
The window itself (loaded from the nib file “MainWindow.xib” contains just one
tab view, with four tabs.
When I start the application, the window appears just like it was designed in
the nib file. Then I resize it and change its position on the screen, as well
as change selected tab of the tab view. Quitting and relaunching the
application shows the window just like it was designed in the nib files, not UI
changes were preserved. The method never gets executed. Additionally, I
don’t see any preserved data for the application being saved in the
“~/Library/Saved Application State/” folder.
Is the code above enough to make this simple UI preservation work, or do I need
to do something more (and what)?
Thanks in advance.
-- Dragan
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