ios - Swift - Google Firebase Authentication with Email -

i trying run example of google firebase authentication email. tried email example of https://github.com/firebase/quickstart-ios/blob/master/authentication/authenticationexampleswift/emailviewcontroller.swift errors in project.

my code looks this:

@ibaction func loginbuttontapped(_ sender: anyobject) {     if let email = self.useremailtextfield.text, let password = self.userpasswordtextfield.text {         showspinner({             // [start headless_email_auth]             firauth.auth()?.signin(withemail: email, password: password) { (user, error) in                 // [start_exclude]                 self.hidespinner({                     if let error = error {                         self.showmessageprompt(error.localizeddescription)                         return                     }                     self.navigationcontroller!.popviewcontroller(animated: true)                 })                 // [end_exclude]             }             // [end headless_email_auth]         })     } else {         self.showmessageprompt("email/password can't empty")     } } 

i error on showspinner({...}) , @ end on self.showmessageprompt("email/password can't empty"):

however, error end showmessageprompt not appear on self.showmessageprompt few lines before. maybe has swift version, tried convert 3, complete project broken after that.

because in quickstart-ios, uses bridging-header of uiviewcontroller+alerts.h file not implemented , not added in project.

so 1 solution use uiviewcontroller+alerts.h bridging header in view controller or remove/modify code code..

 @ibaction func loginbuttontapped(_ sender: anyobject) {     if let email = self.useremailtextfield.text, let password = self.userpasswordtextfield.text {         // [start headless_email_auth]         firauth.auth()?.signin(withemail: email, password: password) { (user, error) in             // [start_exclude]              if let error = error {                 print(error.localizeddescription)                 //show alert                 return             }             self.navigationcontroller!.popviewcontroller(animated: true)              // [end_exclude]         }         // [end headless_email_auth]     } else {        print("email/password can't empty")        //show alert     }  } 

you can find uiviewcontroller+alerts.h , uiviewcontroller+alerts.m files here