Position of The Kivy Label

问题

In the same experiment, I tried to positionize a Label using this code:

class TetraApp(App):

    def build(self):
        Window.size=(875,600)
        Window.clearcolor = (1, 1, 1, 1)
        b = BoxLayout(orientation ='vertical')

#Here, the pos and pos hint doesnt seem to work for small values

        self.lab=Label(text="How Can I Help\n          You?", font_size='35',color =[0, 0, 0, 1],font_name='VarelaRound-Regular',pos=[0.1,0.01],pos_hint={'x': 0.005, 'y': 0})

        self.t = TextInput(hint_text='Say Something...', size_hint=(1,0.25), multiline=False)
        self.t.bind(on_text_validate=self.enterClicked)
        b.add_widget(TitleBar())
        b.add_widget(self.lab)
        b.add_widget(self.t)
        Window.borderless=True
        return b

This is what i get:

回答1:

The problem is not positioning (the BoxLyout handles that), but the size of your Label. You need to provide a height for the Label. Something like:

self.lab=Label(text="How Can I Help\n          You?", font_size='35',color =[0, 0, 0, 1], font_name='VarelaRound-Regular', size_hint_y=None, height=100)

Your TitleBar has a fixed height, the TextInput is set to take up a quarter of the BoxLayout height, and since the default size_hint_y is 1.0, your Label takes the rest of the space. Giving the Label a fixed height, leaves the rest of the space to the TextInput. You could use size_hint_y instead of the fixed height, and that would allow the Label and the TextInput to share the space proportional to their size_hint_y values.

来源：https://stackoverflow.com/questions/60993245/position-of-the-kivy-label