我是 kivy 的初学者，我正在尝试制作这个应用程序，下面的代码需要一些帮助，了解如何将人名保存到变量中，以便我可以在其他屏幕上使用它。 自定义屏幕类有我的保存名称按钮和文本输入，我想保存从此屏幕输入的文本。当用户按下保存名称时，它会将屏幕更改为驾驶屏幕并希望在此屏幕中使用该名称 请耐心阅读，如果可以，请帮助我。 谢谢
from kivy.app import App
import cv2
import numpy as np
from kivy.uix.label import Label
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.screenmanager import SlideTransition
from kivy.uix.textinput import TextInput
from kivy.properties import StringProperty
class CustomScreen(Screen):
def softAlarm(self, *args):
self.sound = SoundLoader.load('Soft-alarm-tone.mp3')
self.sound.loop = True
self.sound.play()
def __init__(self, **kwargs):
super(CustomScreen, self).__init__(**kwargs)
layout = BoxLayout(orientation='vertical')
layout.add_widget(Label(text='Driving Patner', font_size=50))
navig = BoxLayout(size_hint_y=0.2)
label1 = Label(text='Enter your name:', font_size = 30 , valign = 'bottom')
navig.add_widget(label1)
next = TextInput(font_size=30)
name = next.text
btn=Button(text='Save Name', font_size=30 , valign = 'bottom' ,halign='right')
btn.bind(on_release=self.switch_next)
navig.add_widget(next)
navig.add_widget(btn)
layout.add_widget(navig)
self.add_widget(layout)
#Here we can write the code to start video analysis and all that
def switch_next(self, *args):
self.manager.transition = SlideTransition(direction="right")
self.manager.current = self.manager.next()
class DrivingScreen(Screen):
def __init__(self, **kwargs):
super(DrivingScreen, self).__init__(**kwargs)
layout = BoxLayout(orientation='vertical')
layout.add_widget(Label(text='Safe Driving', font_size=50))
navig = BoxLayout(size_hint_y=0.2)
next = Button(text='Start Driving')
next.bind(on_release=self.switch_next)
navig.add_widget(next)
layout.add_widget(navig)
self.add_widget(layout)
#Here we can write to stop video analysis
def switch_next(self, *args):
self.manager.transition = SlideTransition(direction="right")
self.manager.current = self.manager.next()
cap = cv2.VideoCapture(0)
face = cv2.CascadeClassifier('haarcascade_frontalface_default.xml') #reference: https://github.com/opencv/opencv/tree/master/data/haarcascades
eyes = cv2.CascadeClassifier('haarcascade_eye.xml') #reference: https://github.com/opencv/opencv/blob/master/data/haarcascades/haarcascade_eye.xml
while (True):
ret, frame = cap.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
faces = face.detectMultiScale(gray, scaleFactor=1.5, minNeighbors=5)
if len(faces) > 0:
print('Face Detected')
else:
print('Face not Detected')
#Clock.schedule_once(self.softAlarm, 3)
#time.sleep(5) this freezes the whole program, best to find another way to implement
#Event.wait(5)
cv2.rectangle(frame,(0,200), (640,300),(0,255,0),cv2.FILLED)
cv2.putText(frame, "User Distracted",(150,265),cv2.FONT_HERSHEY_COMPLEX_SMALL,2,(0,0,0),2 )
#softAlarm()
for (x, y, w, h) in faces:
#getting coordinates of face
#print(x,y,w,h)
roi = frame[y:y+h, x:x+w]
#setting up bounding boxes for face
color = (0, 0, 255) #note that colors are in BGR and not RGB
color2 = (0, 255, 0 )
stroke = 3
width = x+w
height = y+h
#drawing the bounding box with text
cv2.rectangle(frame, (x, y), (width, height), color, stroke )
cv2.putText(frame, "Face Detected", (x,y-5), cv2.FONT_HERSHEY_PLAIN, 1, color2, 2 )
roi_gray = gray[y:y+h, x:x+w]
roi_color = frame[y:y+h, x:x+w]
eye = eyes.detectMultiScale(roi_gray, scaleFactor=1.3, minNeighbors=2)
if len(eye) > 0:
print('Eyes detected')
else:
print('Eyes not detected')
cv2.rectangle(frame,(0,200), (640,300),(0,0,255),cv2.FILLED)
cv2.putText(frame, "Pay Attention!",(150,265),cv2.FONT_HERSHEY_COMPLEX_SMALL,2,(0,0,0),2 )
for (ex, ey, ew, eh) in eye:
cv2.rectangle(roi_color,(ex,ey), (ex+ew, ey+eh),color2,2)
cv2.imshow('Video', frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
class DrivingSummary(Screen):
def __init__(self, **kwargs):
super(DrivingSummary, self).__init__(**kwargs)
layout = BoxLayout(orientation='vertical')
layout.add_widget(Label(text='Here is your driving summary', font_size=50))
navig = BoxLayout(size_hint_y=0.2)
next = Button(text='START DRIVING AGAIN')
next.bind(on_release=self.switch_next)
navig.add_widget(next)
layout.add_widget(navig)
self.add_widget(layout)
def switch_next(self, *args):
self.manager.transition = SlideTransition(direction="right")
self.manager.current = self.manager.next()
class ScreenManagerApp(App):
def build(self):
root = ScreenManager()
root.add_widget(CustomScreen(name='Screen1'))
root.add_widget(DrivingScreen(name='Screen2'))
root.add_widget(DrivingSummary(name='Screen3'))
return root
# This is only a protection, so that if the file
# is imported it won't try to launch another App
if __name__ == '__main__':
# And run the App with its method 'run'
ScreenManagerApp().run()
答案 0 :(得分：0)
您可以保存对 Screens 中小部件的引用。例如，您的名字 TextInput 可以通过修改 __init__() 的 CustomScreen 方法来保存：
...
self.next = TextInput(font_size=30) # save reference to this TextInput
name = self.next.text
btn = Button(text='Save Name', font_size=30, valign='bottom', halign='right')
btn.bind(on_release=self.switch_next)
navig.add_widget(self.next)
...
并且在 __init__() 的 DrivingScreen 方法中，您可以创建一个 Label 来显示名称：
...
self.driver_name = Label(font_size=25)
layout.add_widget(self.driver_name)
...
然后这些引用可以在 switch_next() 的 CustomScreen 方法中使用：
def switch_next(self, *args):
self.manager.transition = SlideTransition(direction="right")
self.manager.current = self.manager.next()
self.manager.current_screen.driver_name.text = self.next.text