Kivy 入門教程/Hello World!
在 Kivy 中，您需要做的第一件事是讓一個螢幕出現。當您在 PC 上工作時，也會開啟一個命令螢幕。如果您執行任何列印函式（我喜歡這些用於除錯），它們將出現在命令螢幕中（我假設是 Apple OS 的終端，但我沒有一個可以玩）。
開啟 Python IDLE，然後開啟一個新視窗以建立一個可儲存的程式，並將以下程式碼複製到其中
- 程式碼示例 0
- 讓一個螢幕出現
#!/usr/bin/env python
from kivy.app import App #We need to import the bits of kivy we need as we need them as importing everything would slow the app down unnecessarily
from kivy.uix.widget import Widget #this is a thing that you want the App to display
class Lesson0(Widget): #this defines the instance of the widget.
pass # pass is used to keep the class valid but allow it not to contain anything - At the moment our widget is not defined.
class MyApp(App):
def build(self):
return Lesson0()
if __name__ == '__main__': #Documentation suggests that each program file should be called main.py but I think that only matters if you're creating the final App to go onto a phone or tablet we're a long way off from that yet
MyApp().run() #This must match the name of your App
您需要透過 kivy 批處理檔案執行它，才能讓它與 kivy 庫一起執行。有一種方法可以解決這個問題，但它可能很混亂，而這種方法效果很好。您可以在 kivy 網站上找到關於如何設定它的完整說明 這裡。它應該開啟一個空的黑色螢幕。
現在我們想要在螢幕上顯示我們的“Hello World！”文字。為此，我們需要使用一個 Label 來顯示文字。
- 程式碼示例 1
- 顯示“Hello World！”
#!/usr/bin/env python
from kivy.app import App #We need to import the bits of kivy we need as we need them as importing everything would slow the app down unnecessarily
from kivy.uix.widget import Widget #this is a thing that you want the App to display
from kivy.uix.label import Label #this will import the code for the label in which we want to display Hello World!
class Lesson1App(App):
def build(self):
lbl=Label(text='Hello World!') #lbl is a variable name being assigned the Label definition
return lbl #This must match the name of the Widget you want to appear on screen
if __name__ == '__main__': #Documentation suggests that each program file should be called main.py but I think that only matters if you're creating the final App to go onto a phone or tablet we're a long way off from that yet
Lesson1App().run() #This must match the name of your App