Formz

Formz is a super lightweight framework for creating fully customizable forms with validation support that can be easily dropped into any view to work alongside your existing UI.

Features
Requirements
Installation
Usage
Demo App

Features

Each form is fully contained within its own view (so it can be added as a subview to any view and works alongside your other UI elements)
Supports titles (above text field) and helper text (below text field) + all other UITextField properties & customizations (like placeholder text, auto-capitalization style, autocorrection style, etc.)
Fully customizable
- Set style customizations for the whole form (recommended)
- Manually customize each form field
Validation support
Lightweight

Requirements

iOS 10+
Xcode 9.3+
Swift 4+

Installation

Add the following to your Cartfile:

github "jsahoo/Formz"

and run carthage update.

Usage

Drag a View from the Object Library anywhere onto your View Controller (you may also want to give it a placeholder height constraint).

Within the Identity Inspector, set the view's class to FormzView and its module property to Formz.

Within the source code for your view controller, create FormTextFields as needed and add them to your FormView in the order in which they should appear.

let usernameField = FormTextField("username")
usernameField.titleLabel.text = "Username"
usernameField.helperTextLabel.text = "Your username must be between 4 and 10 characters and cannot contain spaces or special characters."
usernameField.helperTextLabel.isHidden = false
usernameField.validationRule = { text in
    guard let text = text, 4 ... 10 ~= text.count else { return false }
    return text.rangeOfCharacter(from: CharacterSet.alphanumerics.inverted) == nil
}
usernameField.textField.autocorrectionType = .no
usernameField.textField.autocapitalizationType = .none
formView.addFormTextField(usernameField)

Validation

Use FormTextField's validationRule property to validate the contents of that specific form field. The closure should return true if validation succeeds, false otherwise.

firstNameField.validationRule = { text in
    // Valid IFF the String is non-empty and contains only letters
    return text?.isEmpty == false && (text?.rangeOfCharacter(from: CharacterSet.letters.inverted) == nil)
}

When you want to validate the whole form (i.e. when user tries to submit), simply call:

formView.validateAllFields()

The function returns true if all fields pass validation, false otherwise.

Get Form Field

formView.formField(withIdentifier: "username")

Get Form Field's Entered Text

formView.textFromFormField(withIdentifier: "username")

Customization

Cuztomizations can either be applied at the form-level (so that all form fields added to the form have the same styling) or to each individual form field.

Form-Level Customizations

formView.titleFont = UIFont(name: "AvenirNext-Regular", size: 14)!
formView.textFieldFont = UIFont(name: "AvenirNext-Regular", size: 17)!
formView.helperFont = UIFont(name: "AvenirNext-Regular", size: 10)!
formView.textFieldTextColor = .black
formView.activeTintColor = .black
formView.inactiveTintColor = .darkGray
formView.validationFailureTintColor = .red
// By default the cursor will use the `activeTintColor`. Set `cursorTintColor` to change it.
// formView.cursorTintColor = .blue

Individual Form Field Customizations

Note that when customizing individual form fields, any property that is not explictly set will default to FormTextField's default value and not the parent FormView's customizations.

let passwordField = FormTextField("password")
passwordField.activeTintColor = .blue
passwordField.inactiveTintColor = .purple
passwordField.validationFailureTintColor = .orange
passwordField.cursorTintColor = .black
passwordField.titleLabel.text = "Password"
passwordField.helperTextLabel.text = "Your password must be at least 8 characters."
passwordField.helperTextLabel.isHidden = false
passwordField.validationRule = { text in
    return (text?.count ?? 0) >= 8
}
passwordField.textField.isSecureTextEntry = true
formView.addFormTextField(passwordField, customAppearance: true)

Demo App

Check out the demo app FormzDemo for more usage examples.

jsahoo / Formz