String (and more) validation for iOS

George Kaimakas

Last update: Nov 13, 2022

Related tags

Validation swift ios application app apple validation cocoapods swift-package-manager swift-3 swift3 validators

Overview

Swift Validators 🔶

String validation for iOS.

Installation
Walkthrough
Usage
Available validators
License

ReactiveSwift + SwiftValidators

Want to use SwiftValidators with ReactiveSwift? SwiftValidatorsReactiveExtensions provides a set of extensions that play well with ValidatingProperty.

Installation

SwiftValidators is available on CocoaPods for iOS 9.0+, Xcode 8 and Swift 3.0

use_frameworks!

target 'MyProject' do
...
pod 'SwiftValidators'
...
end

It is also available through SPM:

import PackageDescription

let package = Package(
name: "MyProject",
targets: [],
dependencies: [
.Package(url: "https://github.com/gkaimakas/SwiftValidators.git",
majorVersion: 6)
]
)

Walkthrough

Usage

Validation is done using the apply function of a Validator. You can create a Validator manually or you can use on of the already available via static functions in the Validator class.

A Validator's apply function accepts an input as a nullable value that conforms to the StringConvertible protocol. By default String, NSString, Int, Float, Double and Bool conform to StringConvertible.

You can specify the Validator's behaviour when it's input is nil if you are using the static Validator function by setting the nilResponse parameter to either true or false. By default nilResponse is set to false.

Validator.exactLength(3).apply("abc") //returns true

Validator.exactLength(3).apply(true) //returns false (the string representation of true is 'true')

Validator.exactLength(3).apply(nil) //returns false since `nilResponse` is set to false by default

Valuidator.exactLength(3, nilResponse: true).apply(nil) //returns true since we set nilResponse to true

For more examples on how to call each validator you can look at the unit tests.

Logical Operators

You can combine operators using the logical AND, logical OR and Logical NOT operators ( &&, || and ! respectively).

let combinedANDValidator = Validator.required() && Validator.isTrue()

The combinedANDValidator will be true only when the value is not empty and "true"

let combinedORValidator = Validator.isTrue() || Validators.isFalse()

The combinedORValidator will be true if the value is "true" or "false", otherwise it will be false.

let reversedValidator = !Validator.isTrue()

The reversedValidator will be false when the value equals "true" and true for all other values.

Available Validators

Name	Description	Type	Arguments	Example
contains	checks if it is contained in the seed	func	String, Bool(nilReponse=false)	Validator.contains("some seed").apply("ee")
equals	checks if it equals another	func	String, Bool(nilReponse=false)	Validator.equals("aa").apply("aa")
exactLength	checks if it has the exact length	func	Int, Bool(nilReponse=false)	Validator.exactLength(2).apply("aa")
isASCII	checks if it is valid ascii string	func	Bool(nilReponse=false)	Validator.isASCII().apply("SDGSFG")
isAfter	checks if it is after the date	func	String, String, Bool(nilReponse=false)	Validator.isAfter("23/07/2015", format: "dd/MM/yyyy").apply("24/07/2015")
isAlpha	checks if it has only letters	func	Bool(nilReponse=false)	Validator.isAlpha().apply("abc")
isAlphanumeric	checks if it has letters and numbers only	func	Bool(nilReponse=false)	Validator.isAlphanumeric().apply("abc123")
isBase64	checks if it a valid base64 string	func	Bool(nilReponse=false)	Validator.isBase64().apply("some string")
isBefore	checks if it is before the date	func	String, String, Bool(nilReponse=false)	Validator.isBefore("25/09/1987", format: "dd/MM/yyyy").apply("29/03/1994")
isBool	checks if it is boolean	func	Bool(nilReponse=false)	Validator.isBool().apply("true")
isCreditCard	checks if it is a credit card number	func	Bool(nilReponse=false)	Validator.isCreditCard().apply("123")
isDate	checks if it is a valid date	func	String, Bool(nilReponse=false)	Validator.isDate("dd/MM/yyyy").apply("25/09/1987")
isEmail	checks if it is an email	func	Bool(nilReponse=false)	Validator.isEmail().apply("[email protected]")
isEmpty	checks if it is an empty string	func	Bool(nilReponse=false)	Validator.isEmpty().apply("")
isFQDN	checks if it is fully qualified domain name	func	FQDNOptions or empty, Bool(nilReponse=false)	Validator.isFQDN().apply("ABC")
isFalse	checks if it is false	func	Bool(nilReponse=false)	Validator.isFalse().apply("false")
isFloat	checks if it is a float number	func	Bool(nilReponse=false)	Validator.isFloat().apply("2.3e24")
isHexColor	checks if it is a valid hex color	func	Bool(nilReponse=false)	Validator.isHexColor().apply("#fafafa")
isHexadecimal	checks if it is a hexadecimal value	func	Bool(nilReponse=false)	Validator.isHexadecimal().apply("abcdef")
isIP	checks if it is a valid IP (4 \|6)	func	Bool(nilReponse=false)	Validator.isIP().apply("0.0.0.0")
isIPv4	checks if it is a valid IPv4	func	Bool(nilReponse=false)	Validator.isIPv4().apply("0.0.0.0")
isIPv6	checks if it is a valid IPv6	func	Bool(nilReponse=false)	Validator.isIPv6().apply("::")
isISBN	checks if it is a valid ISBN	func	ISBN, Bool(nilReponse=false)	Validator.isISBN(.v13).apply("asdf")
isIn	checks if the value exists in the supplied array	func	Array, Bool(nilReponse=false)	Validator.isIn(["a","b","c"]).apply("a")
isInt	checks if it is a valid integer	func	Bool(nilReponse=false)	Validator.isInt().apply("123")
isLowercase	checks if it only has lowercase characters	func	Bool(nilReponse=false)	Validator.isLowercase().apply("asdf")
isMongoId	checks if it a hexadecimal mongo id	func	Bool(nilReponse=false)	Validator.isMongoId()("adfsdffsg")
isNumeric	checks if it is numeric	func	Bool(nilReponse=false)	Validator.isNumeric().apply("+123")
isPhone	checks if it is a valid phone	func	Phone, Bool(nilReponse=false)	Validator.isPhone(.el_GR).apply("6944848966")
isPostalCode	checks it is a valid postal code	func	PostalCode, Bool(nilResponse=false)	Validator.isPostalCode(.GR).apply("30 006")
isTrue	checks if it is true	func	Bool(nilReponse=false)	Validator.isTrue().apply("true")
isURL	checks if it is a valid URL	func	Bool(nilReponse=false)	Validator.isURL().apply("http://www.google.com")
isUUID	checks if it is a valid UUID	func	Bool(nilReponse=false)	Validator.isUUID().apply("243-124245-2235-123")
isUppercase	checks if has only uppercase letter	func	Bool(nilReponse=false)	Validator.isUppercase().apply("ABC")
maxLength	checks if the length does not exceed the max length	func	Int, Bool(nilReponse=false)	Validator.maxLength(2).apply("ab")
minLength	checks if the length isn't lower than	func	Int, Bool(nilReponse=false)	Validator.minLength(1).apply("213")
required	checks if it is not an empty string	func	Bool(nilReponse=false)	Validator.required().apply("")
regex	checks that the value matches the regex from start to finish	func	String, Bool(nilReponse=false)	Validator.regex(pattern).apply("abcd")

*FQDNOptions is a class that is used on isFQDN for configuration purposes. It can be instantiated like this:

FQDNOptions(requireTLD: Bool, allowUnderscores: Bool, allowTrailingDot: Bool)

License MIT

Copyright (c) George Kaimakas [email protected]

Permission is hereby granted, free of charge, to any person obtaining 
acopy of this software and associated documentation files (the 
"Software"), to deal in the Software without restriction, including 
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to 
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be 
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Comments

Validation error ordering issue

I want to show validation error messages at time of user tap on Registration button. Now the issue is

func validationFailed(_ errors:[(Validatable ,ValidationError)])

here errors parameter returns the fields in unordered set.

can we show error messages in ordered set?

opened by ronak-selldo 5

Latest Update Errors

Since updating to latest version.. I get the error "Type 'Validator' (aka 'Optional -> Bool') has no member 'isEmail'"

MY CODE

import UIKit
import SwiftValidators

class TestVC: UIViewController
{
    override func viewDidLoad()
    {
        super.viewDidLoad();

        let is_email = Validator.isEmail("[email protected]");

        print("is_email: \(is_email)");
    }
}

opened by oliverbytes 4

PostalCode.IT.rawValue returns wrong value

case DE, EE, ES, FI, IT, KE, LT, MX, SA, UA = "\\d{5}"

(lldb) po PostalCode.IT.rawValue
"IT"
(lldb) po PostalCode.UA.rawValue
"\\d{5}"

opened by Neirys 3

Added validation for Dutch, Belgian and Belgian mobile phones

I tried to add validation for both Dutch and Belgian phone numbers and Belgian mobile phone numbers.

I explicitly separated Belgian phone numbers and Belgian mobile phone numbers, as they differ and I want to distinguish them to be able to provide the user better feedback in what is wrong.

opened by cloudcosmonaut 2
Carthage support for 8.0.0 version

Added Carthage support to the latest version. No change has been made to the code. Had to add Pods folder to source control because of a build error in Carthage. Note: Please delete the 8.0.0 tag and create it again.

opened by vdeep 1
Email validator fails to validate valid email
Current regex to validate email is not sufficient, it will fail to validate valid emails such as

[email protected] [email protected] [email protected] ...

Regex should include domains which have 6+ character extensions
opened by mruvim 1
Failed with FQDN verification of domain name including numbers other than 9

The title is as follows.

Success: www9.example.com Failed : www1.exaple.com

I think there is a problem with the following code.

Validators.swift(L320) if (!self.regex("[a-z\u{00a1}-\u{ffff0}-9-]+")(_part)){

Thank you.

opened by kumeichi 1
Example Swift Syntax

Hi, I am sure this should be pretty easy. I am fairly new to swift. Cant figure out code syntax to make this work.

Could you share some simple examples validating a variable in Swift 3 as well as validating data in a text field in swift 3.

Thank you.

opened by jrlanders 1

Carthage Issue

*** Checking out SwiftValidators at "5.1.1"
*** xcodebuild output can be found in /var/folders/qp/sfd3f5691qx3hhvljx3r24f80000gn/T/carthage-xcodebuild.dbvqbI.log
*** Skipped building SwiftValidators due to the error:
Dependency "SwiftValidators" has no shared framework schemes

opened by ntanyeri 1

Carthage support

Here is another approach to providing Carthage support. In my previous pull request, I had committed the Pods directory so that the files included in the main project are within the source. But as per your suggestion that Pods directory should not be committed, I had to make some changes.

-> Removed Quick and Nimble dependencies using Cocoapods -> Added the dependencies using Carthage. This way, no extra file is included in the main project. For testing, the users will have to do a carthage bootstrap. -> Shared the framework schema -> No other change has been made to the code.

Let me know if this is okay.

opened by vdeep 0
Advantages from using this library

Hi there, looks interesting 🎉 I read the readme and I'm still having a question.

What's a real world scenario where this library could help. And what are the advantages of using this library?

Will this make my code more readable? So it's like a syntactic sugar?

I think this question could be answered in the readme. What do you think?

opened by Nikoloutsos 3