SwiftValidator

Swift Validator is a rule-based validation library for Swift.

Core Concepts

UITextField + [Rule] + (and optional error UILabel) go into Validator
UITextField + ValidationError come out of Validator
Validator evaluates [Rule] sequentially and stops evaluating when a Rule fails.

Quick Start

# Podfile
source 'https://github.com/CocoaPods/Specs.git'
platform :ios, "8.1"

use_frameworks!
pod 'SwiftValidator', '2.1.1'

Install into your project:

$ pod install

Open your project in Xcode from the .xcworkspace file (not the usual project file):

$ open MyProject.xcworkspace

You can now import SwiftValidator framework into your files.

Initialize the Validator by setting a delegate to a View Controller or other object.

// ViewController.swift
let validator = Validator()

override func viewDidLoad() {
	super.viewDidLoad()

	// Validation Rules are evaluated from left to right.
	validator.registerField(fullNameTextField, rules: [RequiredRule(), FullNameRule()])
	
	// You can pass in error labels with your rules
	// You can pass in custom error messages to regex rules (such as ZipCodeRule and EmailRule)
	validator.registerField(emailTextField, errorLabel: emailErrorLabel, rules: [RequiredRule(), EmailRule(message: "Invalid email")])
	
	// You can validate against other fields using ConfirmRule
	validator.registerField(emailConfirmTextField, errorLabel: emailConfirmErrorLabel, rules: [ConfirmationRule(confirmField: emailTextField)])
	
	// You can now pass in regex and length parameters through overloaded contructors
	validator.registerField(phoneNumberTextField, errorLabel: phoneNumberErrorLabel, rules: [RequiredRule(), MinLengthRule(length: 9)])
	validator.registerField(zipcodeTextField, errorLabel: zipcodeErrorLabel, rules: [RequiredRule(), ZipCodeRule(regex = "\\d{5}")])

	// You can unregister a text field if you no longer want to validate it
	validator.unregisterField(fullNameTextField)
}

Validate Fields on button tap or however you would like to trigger it.

@IBAction func signupTapped(sender: AnyObject) {
	validator.validate(delegate:self)
}

Implement the Validation Delegate in your View controller

// ValidationDelegate methods

func validationSuccessful() {
	// submit the form
}

func validationFailed(errors:[UITextField:ValidationError]) {
	// turn the fields to red
	for (field, error) in validator.errors {
		field.layer.borderColor = UIColor.redColor().CGColor
		field.layer.borderWidth = 1.0
		error.errorLabel?.text = error.errorMessage // works if you added labels
		error.errorLabel?.hidden = false
	}
}

Custom Validation

We will create a SSNRule class to show how to create your own Validation. A United States Social Security Number (or SSN) is a field that consists of XXX-XX-XXXX.

Create a class that inherits from RegexRule

class SSNVRule: RegexRule {

    static let regex = "^\\d{3}-\\d{2}-\\d{4}$"
	
    convenience init(message : String = "Not a valid SSN"){
	self.init(regex: SSNVRule.regex, message : message)
    }
}

Credits

Swift Validator is written and maintained by Jeff Potter @jpotts18.

Contributing