@mikael yeah, we won't be expecting anything specific from Pythonista development. We'll probably go with something like RabbitMQ which doesn't require any compiled library extensions.

Unfortunately I can't really say anything about what I'm working on here...suffice it to say that we have to rapidly respond to client requests in an environment where development isn't macOS-based, is almost entirely python and c++, but still needed to be able to build interfaces for iOS. Pythonista checked those boxes very nicely.

If @olemoritz is listening, he should know just how good this app is.

@mikael thanks, haven't had much time recently. Rest assured, the pythonista-based stuff I've been building is still going strong. In fact, its inherent stability has impressed everyone.

I did google it, and saw that library...but I'm very very wary of using an old, unsupported thing like that. Was hoping someone here might have a better solution. Perhaps I should ping @olemoritz himself? See if we can get zmq included in the next pythonista release.

I guess what I'm really asking is: is there a pure python client for ZeroMQ so that a pythonista-based app can send and receive messages in a ZeroMQ messaging system?

Since pythonista doesn't come with the zmq library installed, it means there would have to be a pure-python zmq substitute out there? Right? Unless I'm missing something.

Has anyone played around with ZeroMQ via pythonista before?

@mcriley821 yeah, that's what I felt as well...just unfortunate that we don't have a way to access the font descriptors they want us to use instead of names. Well, no way via normal Pythonista python APIs, I'm sure we could do it via objc.

Yeah, that makes sense. I just read a stackoverflow post about something similar to this. This isn't a big deal, overall...I can do something other than setting the widget font to the font of the associated widget.

Does this qualify as a "bug" really? Should the value of the widget.font property be returning something which can't be assigned as a valid value to another widget's font property?

Could someone verify my sanity here...I was noticing some widgets in my UI were getting a different non-system font under Pythonista3.3 on iOS13. And when I investigated, it was only widgets who were setting their font to match another widget.

What I'm seeing is that code like this:

label = ui.Label()
print label.font()
button = ui.Button()
print button.font()
label.font = button.font
print label.font()

will end up with label.font being set to something other than the button's font. It will instead be set to ('TimesNewRomanPSMT', 15.0). In fact, the output is:

('.SFUI-Regular', 17.0)
('.SFUI-Regular', 15.0)
('TimesNewRomanPSMT', 15.0)

Which is decidedly strange. It seems like it actually boils down to that '.SFUI-Regular' font name...it's being turned into 'TimesNewRomanPSMT', and the size comes across appropriately. If I directly assign a specific font, or the special '<system>' value for the font, it works as expected.

Is this some new iOS13 font name that Pythonista doesn't handle properly? Admittedly this is a rare thing to do, setting one widget's font to equal another's...but I was expecting it to work, and it did under Pythonista3.2 and iOS12, and I think it was still working under Pyhtonista3.3 and iOS12.

Sorry for the typos and things...I didn't really test what I posted, just copy pasted stuff from my own project and test code, and modified it to remove extra utilities and things that I wrote which are in other modules.

Thanks to those who fixed those issues, glad it's working.

The ViewHierarchy thing is a utility class I have which holds a bunch of tricks and things for helping with navigating the views in my projects. The actual definition of getUIViewController is:

def getUIViewController(cls, view):
        import objc_util
        UIViewController = objc_util.ObjCClass('UIViewController')
        UIView = objc_util.ObjCClass('UIView')
        if isinstance(view,ui.View):
            viewobj = view.objc_instance
        elif isinstance(view,objc_util.ObjCInstance) and \
                view.isKindOfClass_(UIView):
            viewobj = view
        elif isinstance(view,objc_util.ObjCInstance) and \
                view.isKindOfClass_(UIViewController):
            viewobj = view
        viewResponder = viewobj.nextResponder()
        try:
            while not viewResponder.isKindOfClass_(UIViewController):
                viewResponder = viewResponder.nextResponder()
        except AttributeError:
                return None
        return viewResponder

which crawls the responder chain to find the view controller living above the one controlling the passed-in view, or the view controller if one was given. Anyway...looking at what @stephen posted...I think I should actually just be doing that instead.

First, here's a newer version with some improvements which make it work better on iOS 13, and adds a callback which is called when the popover is presented:

def adaptivePresentationStyleForPresentationController_(_self, _cmd,
                                                                controller):
    #### force the popover presentation style to stay as-is
    return -1 # UIModalPresentationNone

def popoverDelegateCompletion(delegate):
    if delegate._popview is not None and delegate._bgcolor is not None:
        delegate._popview.background_color = delegate._bgcolor
    if delegate._completion is not None:
        delegate._completion()
    delegate._popview = None
    delegate._presented_block = None

def popoverPresentationControllerDidDismissPopover_(_self, _cmd, controller):
    import objc_util
    delegate = objc_util.ObjCInstance(_self)
    popoverDelegateCompletion(delegate)

PopoverPresentationDelegate = objc_util.create_objc_class(
                "PopoverPresentationDelegate",
                methods=[adaptivePresentationStyleForPresentationController_,
                            popoverPresentationControllerDidDismissPopover_],
                protocols=["UIPopoverPresentationControllerDelegate"])

def popover(sourceview, popview, presented=None, dismissed=None):
    """Create and display a popover modal view containing the given
    content view, with a little arrow pointing at the given source view.
    'presented' is called when the popover is first presented.
    'dismissed' will be called when the popover is dismissed."""

    def _closer(vc, delegate):
        #### return a function object which will dismiss the popover
        #### and restore the popview bg color, as well as call
        #### any completion function
        def _f():
            vc.dismissViewControllerAnimated_completion_(True,None)
            popoverDelegateCompletion(delegate)
        return _f

    #### find the view controller which is presenting the source view
    #### this is what the popover arrow will point at
    sourcevc = ViewHierarchy.getUIViewController(sourceview)
    #### create a new modal view controller and set its presentation
    #### style to the popover style, and size it to the content
    UIViewController = objc_util.ObjCClass("UIViewController")
    vc = UIViewController.new().autorelease()
    vc.modalPresentationStyle = 7 # UIModalPresentationPopover
    vc.preferredContentSize = objc_util.CGSize(popview.width, popview.height)

    #### As of iOS 13+ popover presentation bounds include the little arrow
    #### as part of the content area.
    #### Since our popup content is designed to be displayed only in the
    #### rectangular portion of the popover view, we constrain it to
    #### the "safe area", which excludes the arrow.
    safeView = objc_util.UIView.new().autorelease()
    safeView.addSubview_(popview.objc_instance)
    safeView.backgroundColor = objc_util.UIColor.clearColor()
    vc.view = safeView
    popview.objc_instance.translatesAutoresizingMaskIntoConstraints = False
    guide = safeView.safeAreaLayoutGuide()
    anchor = popview.objc_instance.leadingAnchor()
    anchor.constraintEqualToAnchor_(guide.leadingAnchor()).active = True
    anchor = popview.objc_instance.trailingAnchor()
    anchor.constraintEqualToAnchor_(guide.trailingAnchor()).active = True
    anchor = popview.objc_instance.topAnchor()
    anchor.constraintEqualToAnchor_(guide.topAnchor()).active = True
    anchor = popview.objc_instance.bottomAnchor()
    anchor.constraintEqualToAnchor_(guide.bottomAnchor()).active = True

    #### retrieve the popover presentation controller for the new modal
    #### view controller, bail if that fails for some reason
    popover = vc.popoverPresentationController()
    if popover is None: return None

    #### create and assign the popover presentation delegate
    delegate = PopoverPresentationDelegate.new().autorelease()
    delegate._completion = dismissed
    delegate._popview = popview
    delegate._bgcolor = None
    popover.delegate = delegate

    #### if the popview has a translucent background, make the
    #### presenting view translucent instead, and the popview transparent,
    #### save the original color to restore on dismissal.
    color = popview.background_color
    if color[3] < 1.0:
        popview.background_color = "clear"
        delegate._bgcolor = color
    popover.backgroundColor = objc_util.UIColor.colorWithRed_green_blue_alpha_(*color)
    popover.sourceView = sourceview.objc_instance
    popover.sourceRect = objc_util.CGRect(objc_util.CGPoint(0,0),objc_util.CGSize(
                                            sourceview.width, sourceview.height))
    #### if a presentation function is provided, it is converted to an
    #### objective-c block to be called when the popover is displayed
    objc_f = None
    if presented is not None:
        objc_f = objc_util.ObjCBlock(presented, None, [objc_util.c_void_p])
        delegate._presented_block = objc_f
    #### present the view controller containing the popover content
    #### via the popover presentation controller, using the
    #### popover delegate we created, and return the close
    #### function to allow caller to close the popover from code
    sourcevc.presentViewController_animated_completion_(vc, True, objc_f)
    return _closer(vc, delegate)

it's simple enough to use. When you wish to display a view as a popover, just call like so:

def popover(sender):
    popview = ui.View()
    popview.width = 200
    popview.height = 100
    popview.add_subview(ui.Label(text="Hello popover!", flex="WH")
    popover(sender, popview)

v = ui.View()
v.width = 300
v.height = 300
b = ui.Button()
b.title = "Show Popover"
b.action = showPopover
b.frame = (0,0,100,40)
b.center = v.center
v.add_subview(b)
v.present("sheet")

@JonB I try very hard not to swizzle anything...it sounds and feels dirty. I did do it once, I admit, in order to make the tableview have the tableView_willDisplayHeaderView_forSection_ method, so I could customize header display.

I suspect you are right about why it isn't working. Using the string comparison is working well enough.

@BapeHiks thanks! I didn't know how to do that.