Question

Python中新调用出来的窗口frame1不显示文字内容,为什么

代码如下：from tkinter import *

root1 = Tk()
frame0 = Frame(root1)
filename = r"C:\Users\53596\Desktop\xiaomao.gif"
photo = PhotoImage(file = filename)
theLabel = Label(root1,
text = '学java开发\n到开源社区',
justify=LEFT,
image=photo,
compound=CENTER,
font=('黑体',20),
fg="blue"
)
theLabel.pack()

def create():
def main():

def callback():
var.set("早上好！")

root = Tk()
root.title("LIN")
root.geometry("400x450")

frame1 = Frame(root)
frame2 = Frame(root)

var = StringVar()
var.set("小主，早上好！")

textLabel = Label(frame1,textvariable=var,justify=LEFT)
textLabel.pack()

theButton1 = Button(frame2,text="回复",command=callback)
theButton1.grid(row=0,column=0)

theButton2 = Button(frame2,text="退出",bg="black",fg="white",
command=root.destroy)
theButton2.grid(row=0,column=2)

frame1.pack(padx=20,pady=20)
frame2.pack(padx=60,pady=150)
mainloop()

if __name__ == '__main__':
main()

theButton0 = Button(frame0,text="进入",command=create)
theButton0.grid(row=0,column=0)
theButton3 = Button(frame0,text="退出",bg="black",fg="white",
command=root1.destroy)
theButton3.grid(row=0,column=2)

frame0.pack(padx=20,pady=20)

mainloop()

Answer 1

你好，你将两个root和root1共用一个mainloop了。所以frame1的那个显示出问题了，下面是我修改以后的代码。

from tkinter import *
def create():
    var.set("++早上好！")
root1 = Tk()
frame0 = Frame(root1)
filename = r"C:\Users\nxf36039\Desktop\20190116115007169.gif"
photo = PhotoImage(file = filename)
var1 = StringVar()
var1.set("早上好！")
#theLabel = Label(root1, text = '学java开发\n到开源社区', justify=LEFT, image=photo, compound=CENTER, font=('黑体',20), fg="blue" )
theLabel = Label(root1, textvariable =var1, justify=LEFT, image=photo, compound=CENTER, font=('黑体',20), fg="blue" )
theLabel.pack()
mainloop()

def callback(): 
    var.set("早上好！")

def main():
    root = Tk()
    root.title("LIN")
    root.geometry("400x450")
    
    frame1 = Frame(root)
    frame1.place(x=100, y=10)
    frame2 = Frame(root)
    
    var = StringVar()
    var.set("小主，早上好！")
    
    textLabel = Label(frame1,textvariable=var,justify=LEFT)
    #textLabel = Label(frame1,text="nihao")
    textLabel.pack()
    
    theButton1 = Button(frame1,text="回复",command=callback)
    #theButton1.grid(padx=20,pady=20)
    
    theButton2 = Button(frame2,text="退出",bg="black",fg="white",command=root.destroy)
    theButton2.grid(padx=40,pady=40)
    
    frame1.pack(padx=20,pady=20)
    frame2.pack(padx=60,pady=150)
    mainloop()
if __name__ == '__main__':
    main()