iOS App in Python with Kivy - Part 2: Architecture and Screens

Part 2 of the Friendly Fitness iOS app in Python with Kivy tutorial

👇 LINKS AND INFO! 👇

In this video, I talk about the file structure I'll use for this app and show you the basics of getting a simple interface up and running in Kivy. I also set up two screens to show you how to transition between screens using a ScreenManager and referencing kv files from other kv files.

Thanks for watching!

[zrichelieu]

why are these videos not getting thousands of views already, been learning kivy for a while and haven't seen a better hands on tutorial. thank you. wish you success in your journey.

[samz]

Very detail tutorial. I want to leave this comment as token of appreciation to keep the hard going on.

[marioshalamanov]

Thats the first video that i'm commenting...
good job man, fast, simple and clean
keep it going!

[PetarLuketina]

This is really good. Your video is a wonderful resource for Kivy beginners. Definitely something I wish I had when starting! If you haven't done so already, consider adding the tutorial tags so that beginners can find this video too. Your print(app.root.ids) is also smart for debugging.

[awaraamin]

a great job, I like it. Kivy is new to me but I enjoyed watching your video :)

[luizhenrique]

Cheers from Brazil, this serie is amazing, is more than just make tutorials from kivy site like some others youtubers that i see while look for kivy tutorials.


+ 1 subscriber

[luiscarlospallaresascanio]

Es un tutorial muy bueno, incluso para alguien que no sabe ingles es claro.

[GabrielPettier]

I'm a bit surprised that you went for overriding the build method there at 1:43, since you named your class `MainApp` and your file `main.kv` the default behavior of kivy is to automatically load the kv file, so saying "you always have to do that", is a bit weird, i mean, you can definitely do it this way, it will work, but it's not strictly necessary.
little tip, at 9:33, `ids` is a `DictProprerty` which is basically a dictionnary, but has the convenient property that you can access the items through dot lookup, instead of the usual [] notation, so you could do instead of

These are minor points though, very good video overall, thanks for doing it :)

[pilarninci]

Hi Erik, I'm having a problem with the part Im using windos btw.

[figueiro]

1- is it a native app or PWA or what?

2- What is the platform of development in this video? Is it git pod?

[qaziapexgrammarschoolpakar]

hi can you tell me how you make a main.kv file?
when i press on new button to make a file there are some options to make txt file, python file, scratch file etc but not kv file. so can you tell me this how you made a kv file?

[xiangshipin]

Which package to install so that it can support GUI

[Altohamy]

which is better for buildozer?,
python2 or python 3?


what is reccomendation for user using windows or linux only?

[joar]

Hi! I am using VS code and have a question regarding the gridlayout. With VS code i cant use the same Gridlayout formation as you do. Do you've any idea what i can do instead?

[Neteruss]

File "kivy\_event.pyx", line 243, in
TypeError: object.__init__() takes exactly one argument (the instance to initialize)

I get this error even with your code from repo. Do you know what does it mean? I'm a bit frustrated with that. I really want to finish this app.

[iDabbl]

How can i switch between a screen (a .kv file), and this, which isnt a .kv file:

class CameraScreen(MDApp):
def build(self):
layout =
self.image = Image()
self.label = MDLabel()


self.save_img_button = MDRaisedButton(
text="Capture",
pos_hint={'center_x': .5, 'center_y': .5},
size_hint=(None, None))


self.capture = cv2.VideoCapture(0)
Clock.schedule_interval(self.load_video, 1.0/30.0)
return layout

def load_video(self, *args):
ret, frame = self.capture.read()
# Frame initialize
self.image_frame = frame
buffer = cv2.flip(frame, 0).tostring()
texture = Texture.create(size=(frame.shape[1], frame.shape[0]), colorfmt='bgr')
texture.blit_buffer(buffer, colorfmt='bgr', bufferfmt='ubyte')
self.image.texture = texture

def take_picture(self, *args):
image_name = "img_TIMESTAMP.png"
img = cv2.cvtColor(self.image_frame, cv2.COLOR_BGR2GRAY)
img = cv2.GaussianBlur(img, (3, 3), 0)
img = cv2.threshold(img, 0, 255, cv2.THRESH_BINARY_INV + cv2.THRESH_OTSU)[1]
text_data = pytesseract.image_to_string(img, lang='eng', config="--psm 6")
self.label.text = text_data
#cv2.imshow("cv2 final image", img)
cv2.imwrite(image_name, self.image_frame)

[Tawkitoutti]

im getting a ScreenManager only accepts screen widget error. any suggestions?

[ArchLight]

I want source code please. getting error