Photos Module - Start Camera from Button
Hi, I want to create a button that launches the camera (...and saves the photo in the next step). Somehow whenever I press the button with
photos.capture_image()in the script below, Pythonsista freezes. I thought that I could get around this with masking it with
@ui.in_backgroundbut that doesn't work. Some idea how to trigger the camera from the button? (Note: If I write the
photos.capture_image()outside of the ui.View class it launches the camera)
import ui import console import clipboard import photos class Extracter(ui.View): def __init__(self): # Some UI Elements (...) # Take Photo Button self.take_photo = ui.Button(flex = 'LR', title = 'Take Photo') self.take_photo.action = self.take_photo_action # Some Button Styles (...) # Take Photo Action @ui.in_background def take_photo_action(self, sender): image = photos.capture_image() if __name__=='__main__': view = Extracter()
cvp last edited by cvp
This code functions
import ui import console import clipboard import photos class Extracter(ui.View): def __init__(self): # Some UI Elements #(...) # Take Photo Button self.take_photo = ui.Button(flex = 'LR', title = 'Take Photo') self.take_photo.action = self.take_photo_action # Some Button Styles #(...) self.add_subview(self.take_photo) # Take Photo Action @ui.in_background def take_photo_action(self, sender): image = photos.capture_image() photos.save_image(image) if __name__=='__main__': view = Extracter() view.present('sheet')
I also got some problems after several tests and I have had to cancel the app before retrying.
Remove Pythonista app from tasks list (4/5 fingers up, slide app up) and restart Pythonista.
On iPhone 6 Plus Pythonista stops responing, even with the subview added, which I intentionally had left out (I thought it would make the code here cleaner, but you are right to add it since it is needed). I've to remove it from the switch to reopen the application.
Sometimes it stops after the press, sometimes the 'camera sheet' slides up but is all black and in the upper right corner is the 'Take Photo' button. After that it stops responing too.
Strange, I don't have these problems on an IPad Mini 4.
I take the photo, then click "use photo", then it's saved in Photos.
Sorry, I can't help 🤕
Phuket2 last edited by
Thanks for the info (just forgotten 🙄) but the problem does not come from the save action (I think but I'm never more sure of nothing) but from the capture action, unless a guru tells me the inverse!
In the initial code sample I don't save the received image, and the application stops responding, so that shouldn't be the problem.
save_image(image)should still work since it is available for backwards compatibility, but was replaced for
But first I have to be able to take the image :)
(Edit: I've tried the same script on an iPhone 6 and it crashes the application too. I've also checked that Pythonista has access to the camera.)
Do you use Pythonista 3 with default Python 3? Just to be sure that you have the same environment as I've, because the script I posted is ok for me.
Phuket2 last edited by
For me, I can take the image, it's the saving that fails. Does not crash, but generates errors when I click use photo. Just mention to give insight. I am on a iPad Pro 12 inch , latest iOS latest Pythonista beta 3
I've Pythonista 3 installed with default interpreter 3.5 on latest iOS 9.3.3
@cvp When you launch the script, do you have to press the button to activate the camera? If I launch it, the camera activates first (I don't see the sheet with the button).
I launch, I see the camera screen, I press the camera button, I hear a click, I press the "use photo" and the script saves the photo
But that's not how the code should work, or did I understand that wrong (explained it wrong)?
It should first show the ui.view sheet with a button called 'Take Photo'. Then you press that button and the camera launches and then you take the photo.
JonB last edited by
The posted code worked for me, but one thing you could try in cases like this is to add a ui.delay with a long enough delay to let the camera view fully dismiss.
# Take Photo Action @ui.in_background def take_photo_action(self, sender): image = photos.capture_image() def a(): photos.save_image(image) self.close() ui.delay(a,.5)
@simple sorry, I forgot to say that I see first the ui with the "take photo" button and of course I press it.
To see the ui sheof t with your "take photo" button, you have first to present the view.
If you first see the UI button the code works as it should.
On my iPhones if I launch the script the camera opens immediately and I don't see the ui.view sheet.
(Edit: I've been mistaken, I do see the ui.view sheet with the button.. I thought that the black ui.view was the camera and not the ui.view. Still, if I press the button the application crashes.)
When you say crash, you mind terminate?
If I go in the settings set that Pythonista can't use camera, I also have this abnormal end.
If I reset on in the settings, I need to remove the app from active tasks to let the script function.
Ok, I got it working.
I've reduced the code to a minimum and checked what happens. With this, Pythonista freezes, I have to remove it from the iOS switch and restart the application.
import ui import photos class Extracter(ui.View): def __init__(self): print('Executed') photos.capture_image() if __name__=='__main__': view = Extracter()
After that I tried to put the
photo.capture_image()out of the class, that worked before and still does but is not what I want.
import ui import photos photos.capture_image() class Extracter(ui.View): def __init__(self): print('Executed') if __name__=='__main__': view = Extracter()
Now after your post @cvp I've double checked that Pythonista has camera permissions. I've disabled it and run the first script, and the camera launched (!) but without a picture. I went back to settings and enabled it again, and now it works.
I've tested that on the second iPhone. If you run the script it freezes as before, disable and enable camera permissions again, and it works.
I've now tested a few code snippets and there still seems to be a problem.
The same script launched several times sometimes activates the camera and sometimes not. If I got back to the button activated camera it doesn't work no matter what I do.