tkinter 的两个例子

第一个例子：after

用于定时操作

import tkinter as tk
import time

class MyApp(tk.Frame):
    def __init__(self, msecs=1000):
        super().__init__()
        self.pack()
        
        self.msecs = msecs
        
        self.utc_time = tk.Label(self, text='', bg='navy', fg='white')
        self.utc_time.pack()
        self.cst_time = tk.Label(self, text='', bg='navy', fg='white')
        self.cst_time.pack()
        
        self.repeater()
        
    def repeater(self):
        self.utc_time.config(text= 'UTC: ' + time.strftime('%Y/%m/%d %H:%M:%S',time.gmtime()))
        self.cst_time.config(text= 'CST: ' + time.strftime('%Y/%m/%d %H:%M:%S',time.localtime()))
        
        self.after(self.msecs, self.repeater)        


if __name__ == '__main__': 
    MyApp(msecs=1000).mainloop()

效果图：

第二个例子：pack_forget

用于切换窗口部件的显示、隐藏

import tkinter as tk

class MyApp(tk.Frame):
    def __init__(self):
        super().__init__()
        self.pack()
        
        # 两个按钮
        self.rowframe = tk.Frame(self)
        self.rowframe.pack(fill='x')
        self.btn2 = tk.Button(self.rowframe, text='按钮2') # , command=self.update
        self.btn2.pack(side=tk.RIGHT)
        self.btn1 = tk.Button(self.rowframe, text='按钮1')
        self.btn1.pack(side=tk.RIGHT)
        
        self.btn1.bind('<Button-1>', self.update)
        self.btn2.bind('<Button-1>', self.update)
        
        
    # 测试pack_forget
    def update(self, event):
        #print(dir(event))
        if event.widget == self.btn1:
            self.btn1.forget()
            self.btn2.pack(side=tk.RIGHT)
        else:
            self.btn2.pack_forget() # 故意的
            self.btn1.pack(side=tk.RIGHT)
        

if __name__ == '__main__': 
    MyApp().mainloop()

效果图：