Question

我需要通过单击“确定”按钮从所有选项卡返回所有变量。我有两个标签。我想要的是当我在第二个标签中输入一些值时，它应该自动出现在'height'条目的第一个标签中。然后，如果我在第一个选项卡中单击“确定”，它应该返回所有变量（从第一个选项卡和第二个选项卡）到我的“主”程序以供进一步使用。感谢

from tkinter import *
from tkinter import ttk

class App1(ttk.Frame):
    def createWidgets(self):
        #text variables
        self.i_height = StringVar()
        self.i_weight = StringVar()
        self.o_bmi = StringVar()

        #labels
        self.label1 = ttk.Label(self, text="Enter your weight:").grid(row=0, column=0, sticky=W)
        self.label2 = ttk.Label(self, text="Enter your height:").grid(row=1, column=0, sticky=W)
        self.label3 = ttk.Label(self, text="Your BMI is:").grid(row=2, column=0, sticky=W)

        #text boxes
        self.textbox1 = ttk.Entry(self, textvariable=self.i_weight).grid(row=0, column=1, sticky=E)
        self.textbox2 = ttk.Entry(self, textvariable=self.i_height).grid(row=1, column=1, sticky=E)
        self.textbox3 = ttk.Entry(self, textvariable=self.o_bmi).grid(row=2, column=1, sticky=E)

        #buttons
        self.button1 = ttk.Button(self, text="Cancel/Quit", command=self.quit).grid(row=3, column=1, sticky=E)
        self.button1 = ttk.Button(self, text="Ok", command=self.calculateBmi).grid(row=3, column=2, sticky=E)

    def calculateBmi(self):
        try:
            self.weight = float(self.i_weight.get())
            self.height = float(self.i_height.get())
            self.bmi = self.weight / self.height ** 2.0
            self.o_bmi.set(self.bmi)
        except ValueError:
            messagebox.showinfo("Error", "You can only use numbers.")
        finally:
            self.i_weight.set("")
            self.i_height.set("")

    def __init__(self, master=None):
        ttk.Frame.__init__(self, master)
        self.grid()
        self.createWidgets()

class App2(ttk.Frame):
    def create_widgets(self):
        """Create the widgets for the GUI"""
        #1 textbox (stringvar)
        self.entry= StringVar()
        self.textBox1= ttk.Entry(self, textvariable=self.entry).grid(row=0, column=1)

        #5 labels (3 static, 1 stringvar)
        self.displayLabel1 = ttk.Label(self, text="feet").grid(row=0, column=2, sticky=W)
        self.displayLabel2 = ttk.Label(self, text="is equivalent to:").grid(row=1, column=0)
        self.result= StringVar()
        self.displayLabel3 = ttk.Label(self, textvariable=self.result).grid(row=1, column=1)
        self.displayLabel4 = ttk.Label(self, text="meters").grid(row=1, column=2, sticky=W)

        #2 buttons
        self.quitButton = ttk.Button(self, text="Quit", command=self.quit).grid(row=2, column=1, sticky=(S,E))
        self.calculateButton = ttk.Button(self, text="Calculate", command=self.convert_feet_to_meters).grid(row=2, column=2, sticky=(S,E))

    def convert_feet_to_meters(self):
        """Converts feet to meters, uses string vars and converts them to floats"""
        self.measurement = float(self.entry.get())
        self.meters = self.measurement * 0.3048
        self.result.set(self.meters)

    def __init__(self, master=None):
        ttk.Frame.__init__(self, master)
        self.grid()
        self.create_widgets()

def button1_click():
    root = Tk()
    app = App1(master=root)
    app.mainloop()

def button2_click():
    root = Tk()
    app = App2(master=root)
    app.mainloop()
def main():
    #Setup Tk()
    window = Tk()

    #Setup the notebook (tabs)
    notebook = ttk.Notebook(window)
    frame1 = ttk.Frame(notebook)
    frame2 = ttk.Frame(notebook)
    notebook.add(frame1, text="BMI Calc")
    notebook.add(frame2, text="Feet to Meters")
    notebook.grid()

    #Create tab frames
    app1 = App1(master=frame1)
    app1.grid()
    app2 = App2(master=frame2)
    app2.grid()

    #Main loop
    window.mainloop()
main()

Answer 1

您的程序中存在一些基本错误 - 您不能同时运行三个主循环。您应该始终只有一个Tk实例，并且只调用一次mainloop。

无论如何，解决方案是您需要在应用程序中创建方法或公共变量，然后您的按钮回调需要能够调用该方法或访问该变量。

例如，您可以这样做：

def callback():
    value1 = app1.getValue()
    value2 = app2.getValue()
    ...

python，tkinter：如何通过所有笔记本选项卡中的单个按钮获取所有变量？

1 个答案: