How can i find NSString having atlease one charater in iPhone app? - iphone

Question

Am working on Message based iPhone app. I have to pass numbers to Webservice if the k like a-z and A-Z i have alert the user to omit the letters from the numbers. How can i find NSString value having a-z and A-Z letters in it? Anyone please help me. Thanks in advance.

Answer 1

That should be it :)
NSCharacterSet *alphaSet = [NSCharacterSet letterCharacterSet];
BOOL valid = [[yourString stringByTrimmingCharactersInSet:alphaSet] isEqualToString:#""];
It removes all the letters from your string, if there is anything left, then valid is NO.
Hope that helps ! :)

Answer 2

Do this:
NSCharacterSet *alphabetSet = [[NSCharacterSet characterSetWithCharactersInString:#"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLKMNOPQRSTUVWXYZ"] invertedSet];
if ([yourString rangeOfCharacterFromSet:alphabetSet].location == NSNotFound) {
if(yourString.length >= 1)
{
// has aleast one character
}
}

Answer 3

If you just want to check if there is ANY character in your string use something like this:
if ([yourString length] > 0) {
// nice feature here is, this will also work when yourString is nil! :D
}
---
If you want to do a more complex check you will have to use Regular Expressions. Use NSRegularExpression class like this:
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:#"^[A-Za-z]+$" options:0] error:NULL];
NSUInteger numberOfMatches = [regex numberOfMatchesInString:yourString
options:0
range:NSMakeRange(0, [string length])];
if (numberOfMatches > 0) {
// yourString does only consist of multiple letters
}
^[a-zA-Z]+$ matches only strings that consist of one or more letters only (^ and $ mark the begin and end of a string respectively). ^[0-9]+$ matches numbers only.

Answer 4

NSString * regexName = #"[a-zA-Z] * ";
NSString *testString = #"your string";
NSPredicate *predicate;
predicate = [NSPredicate predicateWithFormat:#"SELF MATCHES %#",regexName];
if ([predicate evaluateWithObject:testString]) {
NSLog(#"true");
}
else{NSLog"string contains numbers or special characters" ;}

Answer 5

From What I understand you want phone Numbers to be entered
First of all you can set the keypad as UIKeyboardTypePhonePad or UIKeyboardTypeNumberPad for the UITextView you are adding the numbers to.
OR
Pass the text to this function
-(BOOL) checkForPhoneNumber:(NSString *) string
{
NSPredicate *confidenceTest = [NSPredicate predicateWithFormat:#"SELF MATCHES %#",NUMBER_REGEX];
return [confidenceTest evaluateWithObject:string]?YES:NO;
}
where
#define NUMBER_REGEX #"^[0-9]10?$"