Question

背景：我一直在学习Python - 通过它 - Kivy，通过制作应用程序。我一直在使用.kv文件和Builder.load_string方法来创建我的图形，但已决定尝试单独使用python，并将所有布局移动到python中。

问题：当我开始使用屏幕时，我无法将正确的代码绑定到按钮以使屏幕转换。当我写这行时，'self.manager.etc ...'自动完成向我显示了要使用的有效属性列表。

所以在'自我'之后。它表明我可以使用'经理'，然后'经理'。它不认为屏幕的经理有“当前”或“过渡”属性。我一定搞砸了如何将屏幕连接到经理，但我无法理解如何。

class HomePage(Screen):
    def __init__(self, **kwargs):
        super(HomePage, self).__init__(**kwargs)

        layout = FloatLayout()

        notification = Label(text='upcoming: ....', font_size='16sp', size_hint=(0,0), pos_hint={'center_x':.5, 'top':0.9})
        layout.add_widget(notification)

        button_row=BoxLayout(size_hint_y=.1, spacing=20)

        profile_button=Label(text='Profile')
        button_row.add_widget(profile_button)

        layout.add_widget(button_row)
        self.add_widget(layout)

        def transit():
            self.manager.current = profile_button # <- this should work, right?

        profile_button.bind(on_press=transit)

class ScreenApp(App):
    def build(self):
        sm = ScreenManager()
        sm.add_widget(HomePage(name='home'))
        return sm

if __name__ == "__main__":
    ScreenApp().run()

Answer 1

您应该在导入中添加转换

from kivy.uix.screenmanager import Screen, ScreenManager, FadeTransition

并在构建器中传递它

class ScreenApp(App):
    def build(self):
        sm = ScreenManager(transition=FadeTransition())

至于当前你应该添加第二个屏幕，给它一个名字，并使用该名称更改为该屏幕。来自https://github.com/kivy/kivy/blob/master/kivy/uix/screenmanager.py

默认情况下，将显示第一个添加的屏幕。如果你想展示另一个，只需设置当前的＆＃39;属性。 sm.current =＆＃39; second＆＃39;

current也是一个字符串属性，你不能将它设置为标签

：attr：current是：class：~kivy.properties.StringProperty和默认为无。

所以你的完整代码应该是

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.label import Label
from kivy.uix.screenmanager import Screen, ScreenManager, FadeTransition


class HomePage(Screen):
    def __init__(self, **kwargs):
        super(HomePage, self).__init__(**kwargs)

        layout = FloatLayout()

        notification = Label(text='upcoming: ....', font_size='16sp', size_hint=(0,0), pos_hint={'center_x':.5, 'top':0.9})
        layout.add_widget(notification)

        button_row=BoxLayout(size_hint_y=.1, spacing=20)

        profile_button=Button(text='Profile') # changed to a button
        button_row.add_widget(profile_button)
        profile_button.bind(on_press=self.transit) # moved here the bind action
        layout.add_widget(button_row)
        self.add_widget(layout)

    def transit(self, *args):
        # unintended to become a class method and reference to it with self
        print "ok"
        self.manager.current = "screen2"


class ProfilePage(Screen):
    def __init__(self, **kwargs):
        super(ProfilePage, self).__init__(**kwargs)
        layout = FloatLayout()
        labelP = Label(text="Profile Page")
        layout.add_widget(labelP)
        self.add_widget(layout)




class ScreenApp(App):
    def build(self):
        sm = ScreenManager(transition=FadeTransition())
        # create the first screen
        screen1 = HomePage(name='Home') #your home page
        screen2 = ProfilePage(name='screen2') # the second screen
        sm.add_widget(screen1)
        sm.add_widget(screen2)
        return sm

if __name__ == "__main__":
    ScreenApp().run()

如何使用Python访问Kivy屏幕管理器。<property>

1 个答案: