US2FormValidator

Form validation framework for iOS.

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![Import framework screen](https://github.com/ustwo/US2FormValidator/raw/master/Documentation/Images/Form Validator Sample Preview.png)

ustwo™ iOS Form Validator

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

Features

  • 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

Installation

Clone the project

Clone the project from the link above.

Import the framework project into your project

![Import framework screen](https://github.com/ustwo/US2FormValidator/raw/master/Documentation/Images/Import Framework.png)

Set target dependencies

![Target dependencies screen](https://github.com/ustwo/US2FormValidator/raw/master/Documentation/Images/Target Dependencies.png)

Add US2Localizable.strings to your projects Copy Bundle Resources

![Target dependencies screen](https://github.com/ustwo/US2FormValidator/raw/master/Documentation/Images/Bundle Resources.png)

Installation using CocoaPods

How to use CocoaPods? Go to: https://github.com/CocoaPods/CocoaPods

Add the following line to your pod file:

pod 'US2FormValidator', '~> 1.1.2'

How-To

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

@end

Create the implementation.

#import "MyProjectConditionName.h"


@implementation MyProjectConditionName

- (BOOL)check:(NSString *)string
{
    if (nil == string)
        string = [NSString string];
    
    self.regexString = @"[a-zA-Z .-]";
    
    return [super check:string];
}


#pragma mark - Allow violation

- (BOOL)shouldAllowViolation
{
    return YES;
}


#pragma mark - Localization

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


@end

Create own validator

Create the interface.

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


#pragma mark - Validator interface

@interface MyProjectValidatorName : US2Validator
{
}


@end

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;
}


@end

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