您可以使用以下方法查找链接到帐户的提供程序: fetchProvidersForEmail

You can lookup the providers linked to an account using: fetchProvidersForEmail

要重置密码，请使用: sendPasswordResetWithEmail

To reset the password, use: sendPasswordResetWithEmail

还有关于如何发送密码重置并重定向回应用程序的说明: https://firebase.google.com/docs/auth/ios/通过电子邮件传递状态

There are also instructions on how to send the password reset and redirect back to app: https://firebase.google.com/docs/auth/ios/passing-state-in-email-actions