Very often in my code, I need to say in a Screen object this:
self.manager.current = 'screenname'
But sometimes my interpreter says that the None type has no attribute current...
Is it normal that my screen manager disappears?
EDIT:
The problem happens when I add this piece of code to my project:
class EditClass(Screen):
def __init__(self, **kwargs):
super(EditClass, self).__init__(**kwargs)
self.myinit()
def go_to_home(self):
self.manager.current = "home_screen"
def myinit(self):
self.box0 = BoxLayout(orientation='vertical')
self.box1 = BoxLayout(spacing=-2, size=(50,50), size_hint=(1,None))
self.box2 = BoxLayout(orientation='vertical', padding = (5,5,5,5), spacing = 5)
self.btn_back = Button(size=(32, 50), on_press=self.go_to_home(), size_hint=(None, 1), text="<", background_color=(0.239, 0.815, 0.552, 1))
self.btn_title = Button(text="Edit a class", background_color = (0.239, 0.815, 0.552, 1))
self.btn_more= Button(size=(32, 50), size_hint=(None, 1), text="=", background_color = (0.239, 0.815, 0.552, 1))
self.anchor0 = AnchorLayout(anchor_x='right', anchor_y = 'bottom', padding=(5,5,5,5))
self.btn_plus = Button(text="+", size=(46, 46), size_hint=(None, None), background_color=(0.239, 0.815, 0.552, 1))
self.box1.add_widget(self.btn_back)
self.box1.add_widget(self.btn_title)
self.box1.add_widget(self.btn_more)
self.anchor0.add_widget(self.btn_plus)
self.box2.add_widget(self.anchor0)
self.box0.add_widget(self.box1)
self.box0.add_widget(self.box2)
self.add_widget(self.box0)
Instead of adding myinit to __init__ you could schedule it:
from kivy.clock import Clock
...
class EditClass(Screen):
def __init__(self, **kwargs):
super(EditClass, self).__init__(**kwargs)
Clock.schedule_once(self.myinit, 1)
...
def myinit(self, *args):
...
...