import tkinter as tk
from tkinter import messagebox
def register():
    username = entry_username.get()
    email = entry_email.get()
    age = int(entry_age.get())  # 這里會(huì)崩潰
    password = entry_password.get()
    confirm = entry_confirm.get()
    if password == confirm:
        messagebox.showinfo("成功", f"用戶{username}注冊(cè)成功")
    else:
        messagebox.showerror("錯(cuò)誤", "兩次密碼不一致")
root = tk.Tk()
root.title("用戶注冊(cè)")
tk.Label(root, text="用戶名").grid(row=0, column=0)
entry_username = tk.Entry(root)
entry_username.grid(row=0, column=1)
tk.Label(root, text="郵箱").grid(row=1, column=0)
entry_email = tk.Entry(root)
entry_email.grid(row=1, column=1)
tk.Label(root, text="年齡").grid(row=2, column=0)
entry_age = tk.Entry(root)
entry_age.grid(row=2, column=1)
tk.Label(root, text="密碼").grid(row=3, column=0)
entry_password = tk.Entry(root, show="*")
entry_password.grid(row=3, column=1)
tk.Label(root, text="確認(rèn)密碼").grid(row=4, column=0)
entry_confirm = tk.Entry(root, show="*")
entry_confirm.grid(row=4, column=1)
tk.Button(root, text="注冊(cè)", command=register).grid(row=5, column=0, columnspan=2)
root.mainloop()

import tkinter as tk
from tkinter import messagebox
import re
def register():
    # 先清除之前的錯(cuò)誤提示
    error_labels = [lbl for lbl in root.grid_slaves() if isinstance(lbl, tk.Label) and lbl.cget("fg") == "red"]
    for lbl in error_labels:
        lbl.destroy()
    username = entry_username.get().strip()
    email = entry_email.get().strip()
    age_str = entry_age.get().strip()
    password = entry_password.get()
    confirm = entry_confirm.get()
    ok = True
    # 驗(yàn)證用戶名
    if not username:
        show_error("用戶名不能為空", entry_username)
        ok = False
    elif len(username) < 3 or len(username) > 20:
        show_error("用戶名長(zhǎng)度需為3-20位", entry_username)
        ok = False
    # 驗(yàn)證郵箱
    if not email:
        show_error("郵箱不能為空", entry_email)
        ok = False
    elif not re.match(r'^[\w\.-]+@[\w\.-]+\.\w+$', email):
        show_error("郵箱格式不正確", entry_email)
        ok = False
    # 驗(yàn)證年齡
    if not age_str:
        show_error("年齡不能為空", entry_age)
        ok = False
    else:
        try:
            age = int(age_str)
            if age < 1 or age > 120:
                show_error("年齡須在1-120之間", entry_age)
                ok = False
        except ValueError:
            show_error("請(qǐng)輸入數(shù)字", entry_age)
            ok = False
    # 驗(yàn)證密碼
    if not password:
        show_error("密碼不能為空", entry_password)
        ok = False
    elif len(password) < 6:
        show_error("密碼至少6位", entry_password)
        ok = False
    # 驗(yàn)證確認(rèn)密碼
    if password != confirm:
        show_error("兩次密碼不一致", entry_confirm)
        ok = False
    if ok:
        messagebox.showinfo("成功", f"用戶{username}注冊(cè)成功")
def show_error(msg, widget):
    """在指定輸入框下方顯示紅色錯(cuò)誤信息"""
    err_label = tk.Label(root, text=msg, fg="red", font=("Arial", 9))
    # 獲取輸入框的行號(hào)，把錯(cuò)誤提示放在它下面一行
    grid_info = widget.grid_info()
    err_label.grid(row=grid_info["row"] + 1, column=grid_info["column"], sticky="w", padx=5)
    # 讓輸入框變紅邊框（需要額外處理，tkinter默認(rèn)不支持直接改邊框顏色，簡(jiǎn)單起見先不做）

def validate_on_focus_out(event, widget, field_name):
    """當(dāng)輸入框失去焦點(diǎn)時(shí)驗(yàn)證"""
    value = widget.get().strip()
    # 這里可以復(fù)用上面的驗(yàn)證邏輯，但只驗(yàn)證單個(gè)字段
    # 為了演示，先寫一個(gè)簡(jiǎn)單的例子
    if field_name == "username" and value:
        if len(value) < 3 or len(value) > 20:
            show_error("用戶名需3-20位", widget)
        else:
            clear_error(widget)

entry_username.bind("<FocusOut>", lambda e: validate_on_focus_out(e, entry_username, "username"))

def validate_age_input(char):
    """返回值決定是否允許該字符輸入"""
    return char.isdigit() or char == ""  # 允許數(shù)字和刪除鍵
# 創(chuàng)建年齡輸入框時(shí)加上驗(yàn)證
vcmd = root.register(validate_age_input)
entry_age = tk.Entry(root, validate="key", validatecommand=(vcmd, "%S"))

def toggle_password():
    if var_show.get():
        entry_password.config(show="")
        entry_confirm.config(show="")
    else:
        entry_password.config(show="*")
        entry_confirm.config(show="*")
var_show = tk.BooleanVar()
chk_show = tk.Checkbutton(root, text="顯示密碼", variable=var_show, command=toggle_password)
chk_show.grid(row=6, column=0, columnspan=2)

from tkinter import ttk
combo = ttk.Combobox(root, values=["選項(xiàng)A", "選項(xiàng)B", "選項(xiàng)C"], state="readonly")  # 只讀，用戶不能自己輸
combo.bind("<<ComboboxSelected>>", lambda e: print(combo.get()))

username = entry_username.get().strip()  # 養(yǎng)成習(xí)慣

class Validator:
    @staticmethod
    def username(value):
        if not value:
            return False, "用戶名不能為空"
        if len(value) < 3 or len(value) > 20:
            return False, "用戶名需3-20位"
        return True, ""
    @staticmethod
    def email(value):
        if not value:
            return False, "郵箱不能為空"
        if not re.match(r'^[\w\.-]+@[\w\.-]+\.\w+$', value):
            return False, "郵箱格式不正確"
        return True, ""
# 使用時(shí)
valid, msg = Validator.username(username)
if not valid:
    show_error(msg, entry_username)

def validate_all(show_all_errors=False):
    errors = {}
    # 驗(yàn)證每個(gè)字段，存入 errors 字典
    # 字段名為 key，錯(cuò)誤消息為 value
    if show_all_errors:
        for field, msg in errors.items():
            show_error(msg, field_widgets[field])
    return len(errors) == 0