Form validation framework for iOS.
Objective-C C++ Ruby
Switch branches/tags
Pull request Compare This branch is 105 commits behind ustwo:master.
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Failed to load latest commit information.

![Import framework screen]( Validator Sample Preview.png)

ustwo™ iOS Form Validator

This framework allows you to validate inputs of text fields and text views in a convenient way.


  • Simply use US2ValidatorTextField instead of UITextField (US2ValidatorTextView instead of UITextView)
  • Know what went wrong and where
  • Create own conditions using regular expressions for example
  • Create own validators which contain a collection of conditions


Clone the project

Clone the project from the link above.

Import the framework project into your project

![Import framework screen]( Framework.png)

Set target dependencies

![Target dependencies screen]( Dependencies.png)

Installation using CocoaPods

How to use CocoaPods? Go to:

Add the following line to your pod file:

dependency 'US2FormValidator', '~> 1.0.0'


Add a condition to validator

US2Validator *validator = [[US2Validator alloc] init];

US2ConditionAlphabetic *condition = [[US2ConditionAlphabetic alloc] init];
[validator addCondition:condition];
[condition release];

US2ConditionCollection *conditionCollection1 = [validator checkConditions:@"HelloWorld"];
US2ConditionCollection *conditionCollection2 = [validator checkConditions:@"Hello World 123"];

BOOL isValid = conditionCollection1 == nil;                                                  // isValid == YES
isValid = conditionCollection2 == nil;                                                       // isValid == NO

// What went wrong?
NSLog(@"conditionCollection2: %@", conditionCollection2);

Add a validation text field

US2ValidatorTextField *firstNameTextField  = [[US2ValidatorTextField alloc] init];
firstNameTextField.validator               = [[[MyProjectValidatorName alloc] init] autorelease];
firstNameTextField.shouldAllowViolation    = YES;
firstNameTextField.validateOnFocusLossOnly = YES;
firstNameTextField.placeholder             = @"Enter first name";
firstNameTextField.validatorUIDelegate     = self;
[_textUICollection addObject:firstNameTextField];
[firstNameTextField release];

Create own condition

Create the interface.

#import <Foundation/Foundation.h>
#import "US2Condition.h"

@interface MyProjectConditionName : US2Condition


Create the implementation.

#import "MyProjectConditionName.h"

@implementation MyProjectConditionName

- (BOOL)check:(NSString *)string
	if (nil == string)
		string = [NSString string];
	NSError *error             = NULL;
	NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"[a-zA-Z .-]" options:0 error:&error];
	NSUInteger numberOfMatches = [regex numberOfMatchesInString:string options:0 range:NSMakeRange(0, string.length)];
	return numberOfMatches == string.length;

#pragma mark - Allow violation

- (BOOL)shouldAllowViolation
	return YES;

#pragma mark - Localization

- (NSString *)localizedViolationString
	return @"Not a valid name";


Create own validator

Create the interface.

#import <Foundation/Foundation.h>
#import "US2Validator.h"

#pragma mark - Validator interface

@interface MyProjectValidatorName : US2Validator


Create the implementation.

#import "MyProjectValidatorName.h"
#import "MyProjectConditionName.h"
#import "US2ConditionRange.h"

@implementation MyProjectValidatorName

#pragma mark - Initialization

- (id)init
	self = [super init];
	if (self)
		[self addCondition:[[[MyProjectConditionName alloc] init] autorelease]];
		US2ConditionRange *rangeCondition   = [[[US2ConditionRange alloc] init] autorelease];
		rangeCondition.range                = NSMakeRange(2, UINT16_MAX);
		rangeCondition.shouldAllowViolation = YES;
		[self addCondition:rangeCondition];
	return self;