如何解决Kivy无法使用ScreenManager获得文本输入
我正在研究一个项目,并且正在使用kivy。
我想创建一个应用程序,并且需要多个页面,所以我正在使用 ScreenManages 。 我还需要在其中一个页面中输入“用户输入”并将其保存,因此我使用了 MDTextField 来获取文本和一个按钮来保存数据。 当我按下按钮时,应用程序应该从文本字段中获取数据,并使用sqlite3将其保存在文件中,但是当我按下按钮时,它给了我一个非常奇怪的错误。 我尝试只重写应用程序的该页面而不使用ScreenManager,并且它可以正常工作。 如何使它也可以与ScreenManager一起使用?
( 如何使用MDTextField和ScreenManager获取用户输入 )
我将向您展示一些代码行,以使您更好地理解:
这是Kivy代码:
<AddWindow>:
name: "add"
MDTextField:
id: account_link
hint_text: "Link"
helper_text: "Insert the Link of the WebSite to enter in the website from this app"
helper_text_mode: "on_focus"
line_color_normal: app.theme_cls.accent_color
pos_hint: {"center_x": 0.5,"center_y": 0.8}
size_hint_x: None
width: 1200
这是从“文本字段”中获取数据的代码(当用户按下“提交”按钮时执行的那部分代码):
data = self.root.ids["account_link"].text
这是我按下按钮时遇到的错误:
data = self.root.ids["account_link"].text
KeyError: 'account_link'
解决方法
请注意,documentation表示:
id被添加到根小部件的id字典中。
措辞不佳的文档,因为它们在其他地方将“ root widget”称为整个GUI的根。但是在这种情况下,“根小部件”是定义ids
的规则的根。在您的情况下,这可能是AddWindow
规则(由于您的kv
代码段缩进,因此无法100%确定)。如果是这种情况,那么您需要引用出现在GUI中的AddWindow
实例:
data = addwindow_instance.ids["account_link"].text
没有看到更多的代码,我只能猜测访问AddWindow
实例的适当方法。
通过添加完整的代码,我现在可以为您提供帮助。这是您的add_passwd()
方法的修改版本:
def add_passwd(self):
# get a reference to the AddWindow Screen
addwindow_instance = self.root.get_screen('add')
# use that instance to access the MDTextFields
account_link = addwindow_instance.ids["account_link"].text
account_name = addwindow_instance.ids["md_account_name"].text
account_nickname = addwindow_instance.ids["md_account_nickname"].text
email = addwindow_instance.ids["md_email"].text
passwd = addwindow_instance.ids["md_passwd"].text
#TEST
print(account_link)
print(account_name)
print(account_nickname)
print(email)
print(passwd)
请注意,这还需要对kv
进行一些更正。无论您在何处:
id: "some_id"
应更改为:
id: some_id
一个例子是id: "md_account_name"
。
这是我的更多代码:
# Screens
class MainWindow(Screen):
pass
class AddWindow(Screen):
pass
class WindowManager(ScreenManager):
pass
KV = """
WindowManager:
MainWindow:
AddWindow:
<MainWindow>:
name: "main"
MDRoundFlatButton:
text: "Add"
pos_hint: {"center_x": 0.5,"center_y": 0.7}
on_press:
app.root.current = "add"
root.manager.transition.direction = "left"
MDRoundFlatButton:
text: "Show"
pos_hint: {"center_x": 0.5,"center_y": 0.6}
on_press:
app.root.current = "show"
MDTextButton:
text: "Account"
pos_hint: {"center_x": 0.5,"center_y": 0.1}
on_press:
app.root.current = "settings"
root.manager.transition.direction = "up"
<AddWindow>:
name: "add"
MDRaisedButton:
text: "BACK"
md_bg_color: 0,1
pos_hint: {"x": 0.01,"y": 0.93}
on_release:
app.root.current = "main"
root.manager.transition.direction = "right"
MDTextField:
id: account_link
hint_text: "Link"
helper_text: "Insert the Link of the WebSite to enter in the website from
this app"
helper_text_mode: "on_focus"
line_color_normal: app.theme_cls.accent_color
pos_hint: {"center_x": 0.5,"center_y": 0.8}
size_hint_x: None
width: 1200
MDTextField:
id: "md_account_name"
hint_text: "Account"
helper_text: "Insert the Name of the Account You Want to Save"
helper_text_mode: "on_focus"
line_color_normal: app.theme_cls.accent_color
pos_hint: {"center_x": 0.5,"center_y": 0.7}
size_hint_x: None
width: 1200
MDTextField:
id: "md_account_nickname"
hint_text: "Nickname"
helper_text: "Insert the Nickname You Have in the Account"
helper_text_mode: "on_focus"
line_color_normal: app.theme_cls.accent_color
pos_hint: {"center_x": 0.5,"center_y": 0.6}
size_hint_x: None
width: 1200
MDTextField:
id: "md_email"
hint_text: "Email"
helper_text: "Insert the Email You Created the Account with"
helper_text_mode: "on_focus"
line_color_normal: app.theme_cls.accent_color
pos_hint: {"center_x": 0.5,"center_y": 0.5}
size_hint_x: None
width: 1200
MDTextField:
id: "md_passwd"
hint_text: "Password"
helper_text: "Insert Your Password of the Account"
helper_text_mode: "on_focus"
line_color_normal: app.theme_cls.accent_color
pos_hint: {"center_x": 0.5,"center_y": 0.4}
size_hint_x: None
width: 1200
MDFillRoundFlatButton:
text: "Submit"
pos_hint: {"center_x": 0.5,"center_y": 0.1}
on_press: app.add_passwd()
"""
class App(MDApp):
def build(self):
self.title = "Safed" #The Name of the App is "Safed": "Save" + "Saved"
self.theme_cls.theme_style = "Dark" # Light
self.theme_cls.primary_palette = "Blue"
return Builder.load_string(KV)
def add_passwd(self):
account_link = AddWindow_istance.ids["account_link"].text
account_name = self.root.ids["md_account_name"].text
account_nickname = self.root.ids["md_account_nickname"].text
email = self.root.ids["md_email"].text
passwd = self.root.ids["md_passwd"].text
#TEST
print(account_link)
print(account_name)
print(account_nickname)
print(email)
print(passwd)
if __name__ == "__main__":
App().run()
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