How to restrict numbers and special characters in objective-c [duplicate] - objective-c

Question

This question already has answers here:
Restrict NSTextField to only allow numbers
(10 answers)
Closed 8 years ago.
In textfield I want to restrict numbers like (1234567890) and special characters but I want to allow alphanumeric characters. How I am suppose to do this?

Answer 1

Use the UITextField delegate method
textField:shouldChangeCharactersInRange:replacementString:
To check the string that is about to be replaced, if you allow it then return yes if not then return no.
Here is some more information.
Apple UITextField Delegate

Answer 2

try following code
+ (BOOL)isNumber:(NSString *)value {
if ( (value == nil) || ([#"" isEqualToString:value]) ) {
return NO;
}
int l = [value length];
BOOL b = NO;
for (int i = 0; i < l; i++) {
NSString *str =
[[value substringFromIndex:i]
substringToIndex:1];
const char *c =
[str cStringUsingEncoding:
NSASCIIStringEncoding];
if ( c == NULL ) {
b = NO;
break;
}
if ((c[0] >= 0x30) && (c[0] <= 0x39)) {
b = YES;
} else {
b = NO;
break;
}
}
if (b) {
return YES;
} else {
return NO;
}
}
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if ( (string != nil) && (string != #"") ) {
if (![self isNumber:string]) {
return NO;
}
}
return YES;
}

Answer 3

You need to write a NSFormatter and assign it to your text field. Here an example implementation of a such NSFormatter which uses a NSRegularExpression to validate the NSTextField contents.
#interface XXNameElementFormatter : NSFormatter
#end
#implementation HcNameElementFormatter {
NSRegularExpression *_re;
}
- (id)init {
self = [super init];
if (self) {
[self initRegularExpression];
}
return self;
}
- (void)awakeFromNib
{
[self initRegularExpression];
}
- (void)initRegularExpression
{
NSError *reError;
_re = [NSRegularExpression regularExpressionWithPattern:#"^[a-z]*$" options:NSRegularExpressionCaseInsensitive error:&reError];
NSAssert(_re != nil, #"Error in regular expression, error: %#", reError);
}
- (NSString *)stringForObjectValue:(id)obj
{
return obj;
}
- (BOOL)getObjectValue:(out __autoreleasing id *)obj forString:(NSString *)string errorDescription:(out NSString *__autoreleasing *)error
{
*obj = string;
return YES;
}
- (BOOL)isPartialStringValid:(NSString *__autoreleasing *)partialStringPtr proposedSelectedRange:(NSRangePointer)proposedSelRangePtr originalString:(NSString *)origString originalSelectedRange:(NSRange)origSelRange errorDescription:(NSString *__autoreleasing *)error
{
NSParameterAssert(partialStringPtr != nil);
NSString *partialString = *partialStringPtr;
NSRange firstMatch = [_re rangeOfFirstMatchInString:*partialStringPtr options:0 range:NSMakeRange(0, partialString.length)];
return firstMatch.location != NSNotFound;
}
#end