1.創(chuàng)建一個手機(jī)號碼的輸入框，phoneNumField.keyboardType = UIKeyboardTypeNumberPad;用戶輸入完手機(jī)號碼，點(diǎn)擊獲取驗(yàn)證碼按鈕，輸入框文本自動會變成另一段文案（見圖二）；
驗(yàn)證碼按鈕事件：

[self.view endEditing:true];
if (phoneNumField.text.length == 0) {
    [self.hud removeHUD];
    [self.hud showMessage:@"請輸入手機(jī)號碼" inView:self.view];
    return;
}
    if (verificationCodeField.text.length == 0) {
    [self.hud removeHUD];
    [self.hud showMessage:@"請輸入驗(yàn)證碼" inView:self.view];
    return;
}
[_loginViewModel vm_loginWithMobileNumber:phoneNumField.text verificationCode:verificationCodeField.text addressCode:addressCode];

圖一：

圖二：