[Interest] Qt/iOS subclassing and/or delegating
Ben Lau
xbenlau at gmail.com
Fri May 29 15:18:56 CEST 2015
Why don't use categories that suggested by people here?
On 29 May 2015 at 21:11, maitai <maitai at virtual-winds.org> wrote:
> Finally got it working... with a bad hack
>
> I cloned QIOSViewController.h and .mm from qt sources (and added qt's
> iOS headers in my include path, I already had core-private and
> gui-private in my pro files) and modified it to do what I want. I also
> had to add a lockedOrientation property to it for some mysterious
> reason...
>
> At least it's doing what I need (i.e. ignore device rotation when I
> decide to). Of course it's a really bad hack and I'm still hoping
> someone can point me to a better solution.
>
> Thanks
> Philippe.
>
>
> Le 29-05-2015 11:24, maitai a écrit :
> > I had a look at QT sources... Basically what I want to do is override
> > QIOSViewController:shouldAutorotate.
> >
> > I tried
> > @interface MyIOSViewController : QIOSViewController
> > @end
> > @implementation MyIOSViewController
> > - (BOOL) shouldAutorotate {
> > NSLog(@"Inside shouldAutorotate");
> > return NO;
> > }
> >
> > It compiles and does not crash (I import QIOSViewController.h), but
> > that
> > all it does...
> >
> >
> > Le 29-05-2015 10:23, Harri Pasanen a écrit :
> >> Compared to C++, Objective-C is very dynamic language and you can do
> >> many things at runtime.
> >>
> >> So you can add methods to existing classes using categories:
> >>
> https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/CustomizingExistingClasses/CustomizingExistingClasses.html
> >>
> >> Or resort to something quite funky to replace existing methods:
> >> https://github.com/rentzsch/jrswizzle
> >>
> >> As to your original question, rotation handling is surprisingly tricky
> >> even in pure Objective-C if you want to conditionally rotate. For
> >> instance iOS 8.3 broke some of my code handling that which had worked
> >> fine since iOS 6, pure Objective-C.
> >>
> >> I don't know how Qt hooks into it.
> >>
> >> Harri
> >>
> >> On 29/05/2015 09:41, Robert Iakobashvili wrote:
> >>> On Fri, May 29, 2015 at 8:38 AM, maitai <maitai at virtual-winds.org>
> >>> wrote:
> >>>> Thanks Ben for your reply
> >>>>
> >>>> After much digging I made some progress but I am still looking for a
> >>>> way to
> >>>> temporary lock screen auto rotation.
> >>>>
> >>>> I have created my own app delegate to catch openUrl(), and
> >>>> surprisingly it
> >>>> works. I register my app delegate from main.cpp by calling something
> >>>> like
> >>>> this:
> >>>>
> >>>> void QtAppDelegateInitialize ()
> >>>>
> >>>> {
> >>>>
> >>>> QtAppDelegate *appDelegate = (QtAppDelegate *)[[UIApplication
> >>>> sharedApplication] delegate];
> >>>>
> >>>> [[UIApplication sharedApplication] setDelegate:[QtAppDelegate
> >>>> sharedQtAppDelegate]];
> >>>>
> >>>> NSLog(@"Created a new appdelegate");
> >>>>
> >>>> }
> >>>>
> >>>>
> >>>>
> >>>> I then found this very interesting post:
> >>>>
> https://forum.qt.io/topic/48745/how-to-get-didfinishlaunchingwithoptions-called-in-ios-delegate/7
> >>>> which links to this bug report: QTBUG-38184.
> >>>>
> >>>> First question: I am now wondering how my delegate can possibly work
> >>>> since
> >>>> it seems I can have only one delegate... so what happened to
> >>>> QIOSApplicationDelegate?
> >>>>
> >>>> I then tried various things to add yet another delegate this time
> >>>> based on
> >>>> UINavigationControllerDelegate, but although after much sweat it
> >>>> seems to
> >>>> load, the various methods I am trying to override are never called
> >>>> when I
> >>>> rotate the device.
> >>>>
> >>>> Could it be that I should instead modify/interface
> >>>> QIOSApplicationDelegate
> >>>> itself and not try to create my own delegates?
> >>>>
> >>>> A bit confused at this point, I admit ;)
> >>>>
> >>>> Thanks for any tip
> >>>>
> >>>> Philippe Lelong
> >>>>
> >>>>
> >>>>
> >>>> Le 27-05-2015 20:24, Ben Lau a écrit :
> >>>>
> >>>>
> >>>>
> >>>> On 28 May 2015 at 02:07, maitai <maitai at virtual-winds.org> wrote:
> >>>>> Hello all,
> >>>>>
> >>>>> I've started to port on iOS and need to override some methods, like
> >>>>> we
> >>>>> do easily through Java on Qt/Android. I succeeded to implement an
> >>>>> appDelegate in objective-C that works for some events like openURL
> >>>>> and
> >>>>> such, but for instance I also need to lock automatic screen
> >>>>> rotation
> >>>>> in
> >>>>> some circumstances (but not always).
> >>>>
> >>>> Objective-C has a feature to replace the original method of a class.
> >>>> So you
> >>>> may just override the method you needed (In case it don't break Qt)
> >>>> Customizing Existing Classes
> >>>>
> >>>> Example Code:
> >>>> quickios/appdelegate.mm at 0b067e17dc13b8533ca3f7dd574d7e81ea17a015
> >>>> ·
> >>>> benlau/quickios
> >>>>
> >>>> I have tested to override openURL and didFinishLaunchingWithOptions
> >>>> of
> >>>> AppDelegate with Qt 5.4.1. This method works.
> >>>>
> >>>>> I read that I should somehow override "bool
> >>>>> UINavigationController::shouldRotate()"
> >>>>
> >>>> Never tried. But should be worth to try? I am also be interested
> >>>> with
> >>>> your
> >>>> result.
> >>>>
> >>>>> Should I reimp (subclass?) UINavigationController and how? Or is
> >>>>> there a
> >>>>> way to create a new delegate or even better to extend my current
> >>>>> appDelegate?
> >>>>>
> >>>>>
> >>>>> I'm new to Objective-C as you can guess... Any clue would be really
> >>>>> appreciated :)
> >>>>>
> >>>>> Thanks
> >>>>> Philippe Lelong
> >>> Dear Philippe,
> >>>
> >>> Please see the reply Tor Arne inside
> >>>
> >>> https://bugreports.qt.io/browse/QTBUG-42123
> >>>
> >>> That could be an answer - Let it be.
> >>>
> >>> Sincerely,
> >>> Robert
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