[Interest] Qt iOS and App Extensions

Mike Krus mike.krus at kdab.com
Mon May 22 10:21:03 CEST 2017


As far as I know, qmake is not capable of generating Xcode projects with the right
structure (need 2 to start with, different project types, etc).

Mike

> On 21 May 2017, at 11:13, Nuno Santos <nunosantos at imaginando.pt> wrote:
> 
> Robert,
> 
> There is clearly a communication problem here. Maybe I’m not using the correct word.
> 
> I want to know how to make an App Extension from QtCreator. In summary:
> 
> - In order to create an app extension with Qt Creator what should be the qmake flags?
> 
> I want to bypass Xcode. Is this possible?
> 
> Regards,
> 
> Nuno
> 
>> On 21 May 2017, at 10:12, Robert Iakobashvili <coroberti at gmail.com> wrote:
>> 
>> Yes, you can add frameworks to an extension like to
>> any other project in XCode.
>> 
>> So it can look like:
>> 
>> Swift GUI <-> Obj-C-Bridging Code <-> C++ business logic using your
>> frameworks/components.
>> 
>> But do not forget the memory limit - 30 MB.
>> 
>> Take care.
>> 
>> Kind regards,
>> Robert
>> 
>> 
>> On Sun, May 21, 2017 at 12:02 PM, Robert Iakobashvili
>> <coroberti at gmail.com> wrote:
>>> Dear Nuno,
>>> Whatever I did was completely decoupled from Qt.
>>> 
>>> Only XCode project - it was an app with its bundle and within an app
>>> it was a sub-app bundle.
>>> 
>>> But there are many types of extensions.
>>> 
>>> So, starting from an example of your extension and extending
>>> it could be the right path.
>>> 
>>> If you find you still have memory up to 30 MB, you can link
>>> QtCore if it helps you.
>>> 
>>> Your business logic could be in C++ and Swift interface can talk back
>>> and forth with C++ via an objective-C Bridge - even with debugging
>>> going smoothly between the pieces.
>>> 
>>> Sorry for being not too much helpful with a Qt-path.
>>> Kind regards,
>>> Robert
>>> 
>>> 
>>> On Sun, May 21, 2017 at 11:51 AM, Nuno Santos <nunosantos at imaginando.pt> wrote:
>>>> Robert,
>>>> 
>>>> Right now I’m more interested in how to put things together.
>>>> 
>>>> Were you able to do it?
>>>> 
>>>> Where are you coding the extension? With Qt Creator or Xcode?
>>>> 
>>>> How are you setting the project?
>>>> 
>>>> Can the app extension be deployed as a plugin? Like a .component? A dynamic
>>>> library packed in a bundle?
>>>> 
>>>> Because I have already done a AudioUnit in the past and I can make it with
>>>> Qt using the following flags:
>>>> 
>>>> CONFIG += lib_bundle shared
>>>> 
>>>> The thing is that QtCreator doesn’t handle the packaging so I have to
>>>> manually do everything.
>>>> 
>>>> But as for App Extensions I don’t know exactly what they are. I have a Xcode
>>>> example but with Xcode is always hard to decipher how things were made.
>>>> 
>>>> Regards,
>>>> 
>>>> Nuno
>>>> 
>>>> On 21 May 2017, at 05:20, Robert Iakobashvili <coroberti at gmail.com> wrote:
>>>> 
>>>> On Sat, May 20, 2017 at 7:54 PM, Nuno Santos <nunosantos at imaginando.pt>
>>>> wrote:
>>>> 
>>>> HI,
>>>> 
>>>> I’m trying to develop an app extension for my Qt iOS app but I don’t know
>>>> what kind of target it is.
>>>> 
>>>> I always try to use Qt Creator to handle my Qt based projects. In case of
>>>> iOS projects I try to use only Xcode to deployment and debug.
>>>> 
>>>> Is an app extension a framework or a executable?
>>>> 
>>>> As anyone tried this before?
>>>> 
>>>> I want to know how to configure the app extension on Qt Creator .pro
>>>> 
>>>> Regards,
>>>> 
>>>> Nuno
>>>> 
>>>> 
>>>> Hi Nuno,
>>>> When doing it recently, it appears that there's a unpublished memory
>>>> limit of up to 30 MB imposed by Apple that an extension is allowed.
>>>> 
>>>> Initially, I was planning to use Swift interface with QtCore classes in my
>>>> core logic connected by an Objective-C Bridge.
>>>> 
>>>> However, due to the memory limitations, I've migrated from Qt to
>>>> some C-written hash maps, etc containers with less pointers and less
>>>> consumption of memory.
>>>> 
>>>> Take care.
>>>> 
>>>> Kind regards,
>>>> Robert
>>>> 
>>>> 
> 
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Mike Krus | mike.krus at kdab.com | Senior Software Engineer
KDAB (UK) Ltd., a KDAB Group company
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