python - 修改 Tkinter 标签

Question

我知道这已经涵盖了很多。但是，尽管访问了与更改标签文本有关的每个 Stackoverflow 链接，但我仍无法解决我的问题。

我试过使用 StringVar() 和 .configure() 但没有任何运气。

我想做的是，当用户选择所需的类型并单击“显示电影”时，将显示一个字符串，其中包含该类型下可用的电影。

但是，我面临的问题是，尽管使用 .configure() 更新文本，而不是在顶部创建另一个标签，但标签仍然相互重叠。

这是我的应用程序当前正在做什么的一个小演示:标签重叠

from tkinter import *
import tkinter.ttk
import tkinter.messagebox
import datetime

#
# Created by SAXAR on 04/12/2018.
#

timeNow = datetime.datetime.now()  # Creating a variable to use the date time library.

screens = ["Screen 1", "Screen 2", "Screen 3", "Screen 4", "Screen 5", "Screen 6"]

movies = {"Horror": ["The Nun", "Dracula Untold", "Feral", "Shin Godzilla", "Black Death"],
          "Action": ["Venom", "Robin Hood", "Aquaman", "Artemis Fowl", "The Predator"],
          "Drama": ["Creed", "Creed 2", "Outlaw King", "Peppermint", "Sicario: Day of the Soldado"],
          "Comedy": ["Step Brothers", "The Hangover", "Horrible Bosses", "The Other Guys", "Let's Be Cops"],
          "Sci-Fi": ["The Matrix", "Solaris", "Blade Runner", "Interstellar", "Sunshine"],
          "Romance": ["Ghost", "Sliding Doors", "50 Shades of Grey", "Titanic", "La La Land"]}



class Application(Frame):
    def __init__(self, master=None, Frame=None):
        Frame.__init__(self, master)
        super(Application, self).__init__()
        self.createWidgets()

    def updateHorror(self, event=None):
        selectedGenre = self.genreCombo.get()
        print(selectedGenre)
        return selectedGenre

    def createWidgets(self):
        # The heading for the application.
        Label(
            text="___________________________________________________________________________________________________________________________________________").place(
            x=0, y=25)
        self.headingLabel = Label(text="Cinema Bookings")
        self.headingLabel.config(font=("Roboto", 12))
        self.headingLabel.place(x=10, y=10)

        Label(text="________").place(x=10, y=65)
        Label(text="TODAY").place(x=10, y=60)
        Label(text="________").place(x=10, y=42)

        Label(text="Genre: ").place(x=70, y=60)
        self.genreCombo = tkinter.ttk.Combobox(width=15, values=list(movies.keys()), state="readonly")
        self.genreCombo.current(0)
        self.genreCombo.bind('<<ComboboxSelected>>', self.updateHorror)
        self.genreCombo.place(x=110, y=60)

        Label(
            text="___________________________________________________________________________________________________________________________________________").place(
            x=0, y=85)


        Button(text="Display Movie(s)", command=self.createLabel).place(x=585, y=265, width=100)

    def createLabel(self, event=None):

        self.movieLabel = Label(text = "")
        self.movieLabel.place(x=60, y=160)
        self.movieLabel.configure(text=" | ".join(movies.get(self.updateHorror())))


w = 700
h = 300
x = 0
y = 0

app = Application()
app.master.geometry("%dx%d+%d+%d" % (w, h, x, y))
app.master.title("Cinema Booking")
app.mainloop()

请原谅我糟糕的编码。其中大部分是去年类(class)作业的先前作业。

Answer 1

发生这种情况的原因是您在 createLabel() 方法中创建了 movielabel。因此，每次单击该按钮时，都会创建一个新的 movielabel，它会覆盖之前生成的标签。

你想要的是一个单一的标签，每次点击按钮时，它的文本都会相应地改变。因此，您需要在 createWidgets() 函数中创建标签，并在 createLabel 函数中配置其文本。

这是工作代码。

from tkinter import *
import tkinter.ttk
import tkinter.messagebox
import datetime

timeNow = datetime.datetime.now()  # Creating a variable to use the date time library.

screens = ["Screen 1", "Screen 2", "Screen 3", "Screen 4", "Screen 5", "Screen 6"]

movies = {"Horror": ["The Nun", "Dracula Untold", "Feral", "Shin Godzilla", "Black Death"],
          "Action": ["Venom", "Robin Hood", "Aquaman", "Artemis Fowl", "The Predator"],
          "Drama": ["Creed", "Creed 2", "Outlaw King", "Peppermint", "Sicario: Day of the Soldado"],
          "Comedy": ["Step Brothers", "The Hangover", "Horrible Bosses", "The Other Guys", "Let's Be Cops"],
          "Sci-Fi": ["The Matrix", "Solaris", "Blade Runner", "Interstellar", "Sunshine"],
          "Romance": ["Ghost", "Sliding Doors", "50 Shades of Grey", "Titanic", "La La Land"]}

class Application(Frame):
    def __init__(self, master=None, Frame=None):
        Frame.__init__(self, master)
        super(Application, self).__init__()
        self.createWidgets()

    def updateHorror(self, event=None):
        selectedGenre = self.genreCombo.get()
        print(selectedGenre)
        return selectedGenre

    def createWidgets(self):
        # The heading for the application.
        Label(
            text="___________________________________________________________________________________________________________________________________________").place(
            x=0, y=25)
        self.headingLabel = Label(text="Cinema Bookings")
        self.headingLabel.config(font=("Roboto", 12))
        self.headingLabel.place(x=10, y=10)

        Label(text="________").place(x=10, y=65)
        Label(text="TODAY").place(x=10, y=60)
        Label(text="________").place(x=10, y=42)

        Label(text="Genre: ").place(x=70, y=60)
        self.genreCombo = tkinter.ttk.Combobox(width=15, values=list(movies.keys()), state="readonly")
        self.genreCombo.current(0)
        self.genreCombo.bind('<<ComboboxSelected>>', self.updateHorror)
        self.genreCombo.place(x=110, y=60)

        Label(
            text="___________________________________________________________________________________________________________________________________________").place(
            x=0, y=85)

        Button(text="Display Movie(s)", command=self.createLabel).place(x=585, y=265, width=100)
        self.movieLabel = Label(text = "")
        self.movieLabel.place(x=60, y=160)

    def createLabel(self, event=None):
        self.movieLabel.configure(text=" | ".join(movies.get(self.updateHorror())))

w = 700
h = 300
x = 0
y = 0

app = Application()
app.master.geometry("%dx%d+%d+%d" % (w, h, x, y))
app.master.title("Cinema Booking")
app.mainloop()