Refactor iOS UI tests to blueprint architecture

iosApp/CaseraUITests/Framework/ScreenObjects.swift

@@ -5,6 +5,7 @@ struct UITestID {
         static let ready = "ui.app.ready"
         static let onboarding = "ui.root.onboarding"
         static let login = "ui.root.login"
+        static let mainTabs = "ui.root.mainTabs"
     }
 
     struct Onboarding {
@@ -88,7 +89,12 @@ struct OnboardingWelcomeScreen {
     }
 
     func tapAlreadyHaveAccount() {
-        loginButton.waitUntilHittable(timeout: 10).tap()
+        loginButton.waitForExistenceOrFail(timeout: 10)
+        if loginButton.isHittable {
+            loginButton.tap()
+        } else {
+            loginButton.forceTap()
+        }
     }
 }
 
@@ -224,20 +230,44 @@ struct RegisterScreen {
     }
 
     func fill(username: String, email: String, password: String) {
+        func advanceToNextField() {
+            let keys = ["Next", "Return", "return", "Done", "done"]
+            for key in keys {
+                let button = app.keyboards.buttons[key]
+                if button.waitForExistence(timeout: 1) && button.isHittable {
+                    button.tap()
+                    return
+                }
+            }
+        }
+
         usernameField.waitForExistenceOrFail(timeout: 10)
         usernameField.forceTap()
         usernameField.typeText(username)
+        advanceToNextField()
 
         emailField.waitForExistenceOrFail(timeout: 10)
-        emailField.forceTap()
+        if !emailField.hasKeyboardFocus {
+            emailField.forceTap()
+            if !emailField.hasKeyboardFocus {
+                advanceToNextField()
+                emailField.forceTap()
+            }
+        }
         emailField.typeText(email)
+        advanceToNextField()
 
         passwordField.waitForExistenceOrFail(timeout: 10)
-        passwordField.forceTap()
+        if !passwordField.hasKeyboardFocus {
+            passwordField.forceTap()
+        }
         passwordField.typeText(password)
+        advanceToNextField()
 
         confirmPasswordField.waitForExistenceOrFail(timeout: 10)
-        confirmPasswordField.forceTap()
+        if !confirmPasswordField.hasKeyboardFocus {
+            confirmPasswordField.forceTap()
+        }
         confirmPasswordField.typeText(password)
     }