TryCatch.swift

@IBAction func signupButtonClicked(_ sender: UIButton) {
        
        do {
            try decideToSendSignupData()
            
            SVProgressHUD.setDefaultMaskType(.gradient)
            SVProgressHUD.show(withStatus: LoadingMessages.simple.localized )
            self.serviceCore.sendSignUpRequet(email: self.emailTextField.text!, password: self.passTextField.text!)
            
        }
        catch RegisterError.incorrectEmail {
            
            self.showMessageView(message: RegisterError.incorrectEmail.localized, style: .error)
        }
            
        catch RegisterError.incorrectPass {
            
            self.showMessageView(message: RegisterError.incorrectPass.localized, style: .error)
        }
        catch RegisterError.unequalPassword {
            
            self.showMessageView(message: RegisterError.unequalPassword.localized, style: .error)
        }
        catch{}
        
    }
    
    func decideToSendSignupData() throws {
        
        guard emailTextField.text!.isValidEmail() else {
            throw RegisterError.incorrectEmail
        }
        
        guard passTextField.text!.isValidPassword() else {
            throw RegisterError.incorrectPass
        }
        guard repeatPassTextField.text?.characters.count == passTextField.text?.characters.count else {
            throw RegisterError.unequalPassword
        }
        
    }
enum RegisterError : String, Error {
    
    case incorrectEmail           = "incorrectEmail"
    case incorrectPass            = "incorrectPassword"
    case incorrectUsernameOrPass  = "incorrectUsernameOrPass"
    case incompatibilityPasswords = "incompatibilityPasswords"
    case exceededLoginRequest     = "ExceededLoginRequest"
    case inactiveUser             = "InactiveUser"
    case duplicateEmail           = "DuplicateEmail"
    case unequalPassword          = "UnequalPassword"
    
    var localized: String {
        return self.rawValue.localized
    }
}