我可以从 Python 触发在 KV 文件中创建的屏幕吗？

Posted 2023-04-14

【中文标题】我可以从 Python 触发在 KV 文件中创建的屏幕吗？

【英文标题】：Can I trigger a screen created in KV file from Python?

【发布时间】：2020-11-11 17:40:18

【问题描述】：

您好，

我实际上想要做的是：

我想创建这个登录屏幕，如果你有正确的邮件（在这种情况下只有 [e-mail]）来触发来自 KV 文件的 inapp 屏幕，这是我的实际问题。

我无法触发“inapp”屏幕

我在 PY 文件中没有我的屏幕管理器和屏​​幕类的原因是它出现了错误，并且当我切换屏幕时它重叠 Here is an example of the buggy UI

我做错了什么？

这是我的 PY 文件：

class mytest(MDApp):
    
    def build(self):
        self.theme_cls.theme_style = "Dark"

        self.theme_cls.accent_palette = 'Blue'
        self.theme_cls.accent_hue = '300'

        self.theme_cls.primary_palette = "Green" 
        self.theme_cls.primary_hue = "400" 
        
        self.icon = 'testphoto.png'
        self.title = "coolapp"
        

    def login_checker(self, mail, psswrd):
       
        hismail = mail
        hispass = psswrd

        print(themail)
        print(thepass)
      
        access_screen = self.root.ids.inapp

        if themail == "[e-mail]":
            print("Corect")
            access_screen

        else:
            toast("Invalid E-mail")

这是KV文件：

BoxLayout:

    ScreenManager:
        id: scrin_meneger
    
       
        Screen:     #LOGIN 
            name: "login"
            id: loginn
            
            FloatLayout:
                orientation: 'vertical'
                Image:  #Login Background Image
                    source: "./pictures/whitebg.jpg"
                    allow_stretch: True
                    keep_ratio: False

                MDTextField:    #mail-input
                    id: emadress
                    pos_hint: 'center_x': .5, 'center_y': .6
                    size_hint: 0.60, 0.06

                    hint_text: "Email: "
                    current_hint_text_size: 0.5, 1
                    current_hint_text_color: 0, 0, 0, .60
                    
                    helper_text: "No input provided"
                    helper_text_mode: "on_error"
                    

                    color_mode: 'custom'
                    line_color_focus: 0, 0, 0, 1     
                    
                    
                    required: True                   
                    max_text_lenght: 20             
                    #min_text_lenght: 5              

                MDTextField:    #pass-input
                    id: psswd
                    pos_hint: 'center_x': .5, 'center_y': .5
                    size_hint: 0.60, 0.06

                    password: True

                    hint_text: "Password: "
                    current_hint_text_color: 0, 0, 0, .60
                    
                    helper_text: "No input provided"
                    helper_text_mode: "on_error"
                    
                    color_mode: 'custom'
                    line_color_focus: 0, 0, 0, 1    
                    
                    
                    required: True                    
                    max_text_lenght: 20             
                    #min_text_lenght: 5              


                MDFlatButton:   #Login Button
                    text: "Login"
                    text_color: 0, 0, 0, .80
                    
                    pos_hint: 'center_x': .3, 'y': .2
                    size_hint: 0.4, 0.1
                    on_release: 
                        app.login_checker(emadress.text, psswd.text)

        Screen:     #Application
            name: 'inapp'
            id: inapp

            BoxLayout:
                orientation: 'vertical'
                MDBottomNavigation:

                #Screen 1

                    MDBottomNavigationItem:
                        id: main_screen
                        name: "main_menu"
                        text: "Main Menu"
                        icon: "air-humidifier"

                        BoxLayout:
                            orientation: 'vertical'

                            MDToolbar:
                                id: toolbar
                                title: "This is my MDToooolbar"

【参考方案1】：

你只需要访问ScreenManager来设置currentScreen，像这样：

    if themail == "[e-mail]":
        print("Corect")
        self.root.ids.scrin_meneger.current = 'inapp'

    else:
        toast("Invalid E-mail")

【讨论】：

我太笨了。非常感谢约翰的回答！