Let's have a look into for String categories with below features,
* Email validation
* Phone number validation
* String empty validation
* Remove number characterset
and more on..
Let's have a look into "NSString+Utilities.h"
* Email validation
* Phone number validation
* String empty validation
* Remove number characterset
and more on..
- Create a New file in XCode. File -> New -> File (Cmd + N)
- Choose "Cocoa Touch Class"
- Create the file name as "NSString+Utilities" and subclass it with NSString
- Then, click finish. Your category file is ready.
We are gonna see basic String category methods which are listed below
- (NSString *)removeNumbersFromString;
- (BOOL)isEmailValid;
- (BOOL)isMobileValid;
- (BOOL)validateString;
Let's have a look into "NSString+Utilities.h"
#import <Foundation/Foundation.h>
@interface NSString (StringValidations)
- (NSString *)removeNumbersFromString;
- (BOOL)isEmailValid;
- (BOOL)isMobileValid;
- (BOOL)validateString;
@end
And, your "NSString+Utilities.m"
#import "NSString+Utilities.h"
@implementation NSString (StringValidations)
- (NSString *)removeNumbersFromString
{
NSString *trimmedString = nil;
NSCharacterSet *numbersSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];
trimmedString = [self stringByTrimmingCharactersInSet:numbersSet];
return trimmedString;
}
/**
* Method to validate the email
* @param email variable from NSString class type
* @return email returns BOOL result
*/
- (BOOL)isEmailValid {
NSString *emailRegex = @"[a-zA-Z0-9\\+\\.\\_\\%\\-\\+]{1,256}+\\@[a-zA-Z0-9][a-zA-Z0-9\\-]{0,64}+\\.[a-zA-Z0-9][a-zA-Z0-9\\-]{0,25}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
return [emailTest evaluateWithObject:self];
}
/**
* Method to validate the email
* @param number variable from NSString class type
* @return number returns BOOL result
*/
- (BOOL)isMobileValid {
NSError *error = NULL;
NSDataDetector *detector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypePhoneNumber error:&error];
NSRange inputRange = NSMakeRange(0, [self length]);
NSArray *matches = [detector matchesInString:self options:0 range:inputRange];
// no match at all
if ([matches count] == 0) {
return NO;
}
// found match but we need to check if it matched the whole string
NSTextCheckingResult *result = (NSTextCheckingResult *)[matches objectAtIndex:0];
if ([result resultType] == NSTextCheckingTypePhoneNumber && result.range.location == inputRange.location && result.range.length == inputRange.length) {
// it matched the whole string
return YES;
}
else {
// it only matched partial string
return NO;
}
}
- (BOOL)validateString {
id stringValue = self;
if ([stringValue length] == 0 && stringValue == [NSNull null] && stringValue == nil)
return NO;
else
return YES;
}
@end
That's it. You can start using these category methods in your ViewControllers just by importing import "NSString+Utilities.h"
Cheers
