UserDataValidation.h

//
//  NameValidation.h
//  Radwa
//
//  Created by Radwa Muahammd on 7/1/13.
//  Copyright (c) 2013 Radwa Muahammd. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface UserDataValidation : NSObject

+(BOOL)isNameValid:(NSString*)name;
+(BOOL)isEmailVaild:(NSString*)email;
+(BOOL)isPasswordVaild:(NSString *)password;
+(BOOL)isPassword:(NSString *)password1 matchesRetypedPassword:(NSString *)password2;
+(BOOL)isPhoneNumberValid:(NSString*)phoneNumber;
+(BOOL)isLargeTextValid:(NSString*)text withMaximumLength:(int)length; //large text like bio,address,list
@end

UserDataValidation.m

//
//  NameValidation.m
//  Radwa
//
//  Created by Radwa Muahammd on 7/1/13.
//  Copyright (c) 2013 Radwa Muahammd. All rights reserved.
//
#import "UserDataValidation.h"

@implementation UserDataValidation

+(BOOL)isNameValid:(NSString*)name{
    BOOL isValid = YES;
    NSString* nameValidation=[name stringByReplacingOccurrencesOfString:@" " withString:@""];

    if (nameValidation.length<2 || nameValidation.length>71) { //check length limitation
        isValid=NO;

    }
    else{ // check characters validation
    
    NSCharacterSet *alphanumericSet = [NSCharacterSet letterCharacterSet];

       NSCharacterSet* nonAlphanumericSet=[alphanumericSet invertedSet];// now it contains all the not allowed character set

    if ([nameValidation rangeOfCharacterFromSet:nonAlphanumericSet].location != NSNotFound) {
#ifdef DEBUG
        NSLog(@"the name contains illegal characters");
#endif
        isValid=NO;
        }
    }

    return isValid;
}

+(BOOL)isEmailVaild:(NSString *)email{
    BOOL isValid=NO;
    
    if (email.length) {
        NSString *regExPattern = @"[A-Za-z0-9._%+-]+@(?:[A-Za-z0-9-]+\.)+[A-Za-z]{2,4}";

        NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regExPattern];
        isValid= [emailTest evaluateWithObject:email];
    }
    return isValid;
}

+(BOOL)isPhoneNumberValid:(NSString *)phoneNumber{
    BOOL isValid=YES;
    NSString* nameValidation=[phoneNumber stringByReplacingOccurrencesOfString:@" " withString:@""];

    if (nameValidation.length<10 || nameValidation.length>11) { //check length limitation
        isValid=NO;
        
    }
    else{
        NSCharacterSet *numericSet = [NSCharacterSet decimalDigitCharacterSet];

        numericSet=[numericSet invertedSet];// now it contains all the not allowed character set

        if ([phoneNumber rangeOfCharacterFromSet:numericSet].location != NSNotFound) {
    #ifdef DEBUG
            NSLog(@"the phoneNumber contains illegal characters");
    #endif
            isValid=NO;
    }
    }
    return isValid;
}

+(BOOL)isPasswordVaild:(NSString *)password{
    BOOL isValid = YES;
    NSString* nameValidation=[password stringByReplacingOccurrencesOfString:@" " withString:@""];

    if (nameValidation.length< 6 ||nameValidation.length>32) { //if password is empty,or not match the length rule
        isValid=NO;
    }

    return isValid;
}
+(BOOL)isPassword:(NSString *)password1 matchesRetypedPassword:(NSString *)password2{
    BOOL isValid = YES;
    
    if (!password2.length || ![password1 isEqualToString:password2]){
        //if the retyped password isn't empty and doesn't match the password
        isValid=NO;
    }
    
    return isValid;
}
+(BOOL)isLargeTextValid:(NSString *)text withMaximumLength:(int)length{
    BOOL isValid = YES;
    NSString* nameValidation=[text stringByReplacingOccurrencesOfString:@" " withString:@""];

    if (!nameValidation.length ||nameValidation.length>length) {
        isValid=NO;
    }
    
    return isValid;
}
@end