Developing Login and Password Authentication Screen
The login screen is the first thing users see after installation. And one of the few screens where technical implementation directly impacts conversion: wrong keyboard type, missing autofill, login button hidden behind the keyboard — and some users just leave.
What's Often Done Wrong
Password field without secureTextEntry (iOS) or inputType="textPassword" (Android) — password visible in plain text. Rarer than it seems, but happens.
Email field keyboard without keyboardType = .emailAddress on iOS — user doesn't see @ on first keyboard screen. Small thing, but annoying.
Login button covered by system keyboard without KeyboardAvoidingView (React Native) or adjustResize / WindowInsets (Android). User filled fields, doesn't see button, doesn't know what to do.
Missing Password AutoFill. On iOS, this is textContentType = .password for password field and textContentType = .username for login — then iOS offers saved password from Keychain. On Android — autofillHints attributes with AUTOFILL_HINT_USERNAME and AUTOFILL_HINT_PASSWORD. Without this, users with password managers struggle.
How We Implement
On iOS (Swift/UIKit): UITextField with textContentType, autocorrectionType = .no, autocapitalizationType = .none for login field. Login button in inputAccessoryView — it's always visible above keyboard, regardless of screen height.
On iOS (SwiftUI): SecureField for password, .textContentType(.emailAddress) and .keyboardType(.emailAddress) modifiers. .submitLabel(.next) on login field moves focus to password, .submitLabel(.go) on password submits form.
On Android (Kotlin/Compose): OutlinedTextField with keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Email, imeAction = ImeAction.Next) for login. For password — visualTransformation = PasswordVisualTransformation(), visibility icon implemented via trailingIcon with transformation toggle.
React Native: TextInput with autoComplete="email", keyboardType="email-address", textContentType="emailAddress" for login field (yes, three different attributes for three platforms). Password: secureTextEntry={!visible} with managed state for eye icon.
Validation — on client before sending. Email regex shouldn't be strict: /.+@.+\..+/ is enough. Empty field — not regex error, just "Enter email". Minimum password length — checked locally, but real password policy rules come from server.
Authorization requests over HTTPS only, credentials not written to logs. After successful login — token in Keychain (iOS) / EncryptedSharedPreferences (Android), not in UserDefaults/SharedPreferences unencrypted.
Timeline: 3-7 working days including UX design, platform-specific implementation, and basic UI test coverage.