Jak mogę ograniczyć znaki specjalne w UITextField oprócz kropek i podkreślenia?

Jak mogę ograniczyć znaki specjalne w UITextField poza kropką i podkreśleniem?

Wypróbowałem poniższy fragment kodu, ale bez powodzenia: 

#define ACCEPTABLE_CHARECTERS @" ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_."

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
         NSCharacterSet *acceptedInput = [NSCharacterSet characterSetWithCharactersInString:ACCEPTABLE_CHARECTERS];
        if (![[string componentsSeparatedByCharactersInSet:acceptedInput] count] > 1){
            NSLog(@"not allowed");
            return NO;
        }
        else{
            return YES;
        }
}
Author: Tamás Sengel, 2013-01-28
Source

10 answers

Spróbuj bloku kodu podanego poniżej, to działało dobrze dla mnie.

SWIFT 3.0 

let ACCEPTABLE_CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_"

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    let cs = NSCharacterSet(charactersIn: ACCEPTABLE_CHARACTERS).inverted
    let filtered = string.components(separatedBy: cs).joined(separator: "")

    return (string == filtered)
}

Objective C 

#define ACCEPTABLE_CHARACTERS @" ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_."

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string  {
      NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:ACCEPTABLE_CHARACTERS] invertedSet];

      NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];

      return [string isEqualToString:filtered];
}
Mam nadzieję, że to zadziała również dla Ciebie.
 102
Author: Mrunal,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2017-11-08 07:42:22

Spróbuj tego 

NSCharacterSet  *set= [NSCharacterSet symbolCharacterSet];
if ([string rangeOfCharacterFromSet:[set invertedSet]].location == NSNotFound) {
    // valid
} else {
    // invalid
}

Możesz stworzyć swój własny zestaw za pomocą 

NSCharacterSet  *set= [NSCharacterSet characterSetWithCharactersInString:@"<all your symbols you want to ignore>"];
 4
Author: amar,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2013-01-28 08:33:39

NSString *Regex = @"[A-Za-z0-9^]*";

NSPredicate *TestResult = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", Regex];

[TestResult evaluateWithObject:@"YourTestString"];

Last return wartość logiczna true / false

W Metodzie 

+ (BOOL) validateSpecialCharactor: (NSString *) text {
NSString *Regex = @"[A-Za-z0-9^]*";
NSPredicate *TestResult = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", Regex];
return [TestResult evaluateWithObject:text];
}
 3
Author: Indra,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2015-01-19 05:12:39

Swift 2.2 na podstawie Odpowiedzi Mrunala : 

let notAllowedCharacters = " ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.";
func textField(
    textField: UITextField,
    shouldChangeCharactersInRange range: NSRange,
    replacementString string: String)
    -> Bool
{
    let set = NSCharacterSet(charactersInString: notAllowedCharacters);
    let inverted = set.invertedSet;

    let filtered = string
        .componentsSeparatedByCharactersInSet(inverted)
        .joinWithSeparator("");
    return filtered == string;

}
 3
Author: Evdzhan Mustafa,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2017-05-23 11:47:01

Swift 4 

let RISTRICTED_CHARACTERS = "'*=+[]\\|;:'\",<>/?%"

UITextField metoda delegata: 

func textField(_ textField: UITextField, shouldChangeCharactersIn _: NSRange, replacementString string: String) -> Bool {
    let set = CharacterSet(charactersIn: RISTRICTED_CHARACTERS)
    let inverted = set.inverted
    let filtered = string.components(separatedBy: inverted).joined(separator: "")
    return filtered != string
}
 3
Author: Sunil Targe,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2018-08-08 07:10:55

rozwiązanie Swift 3.1

let ACCEPTABLE_CHARACTERS = " ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_."
    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        let cs = CharacterSet(charactersIn: ACCEPTABLE_CHARACTERS).inverted
        let filtered: String = (string.components(separatedBy: cs) as NSArray).componentsJoined(by: "")
        return (string == filtered)
    }
 2
Author: Sourabh Sharma,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2017-04-21 06:48:34

To może Ci pomóc.. i daj mi znać proszę 

-(BOOL)isHaveSpecialChar:(NSString*)str{
NSString *customStr = @"~`!@#$%^&*()+=-/;:\"\'{}[]<>^?, ";
NSCharacterSet *alphaSet = [NSCharacterSet characterSetWithCharactersInString:customStr];
BOOL isHaveSpecialChar = [[str stringByTrimmingCharactersInSet:alphaSet] isEqualToString:@""];
return !isHaveSpecialChar;
}
 1
Author: SachinVsSachin,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2013-01-28 09:35:09 
func  textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

    let set = NSCharacterSet(charactersIn: "0123456789")
    let inverted = set.inverted;

    let filtered = string.components(separatedBy: inverted).joined(separator: "")
    return filtered == string;
 1
Author: GOWTHAM,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2016-11-02 12:50:09 
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    let cs = NSCharacterSet.decimalDigits.inverted
    let filtered = string.components(separatedBy: cs).joined(separator: "")
    return (string == filtered)
}
 0
Author: Aleksey Mazurenko,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2019-03-04 12:20:13

Spróbuj tego: 

NSString *str = @"___asdf.SHiv._.l.asg.  g.g._ASdgASG_.......asfgads.g.   .._____fdgdsfghsdfgh";

    str= [str stringByReplacingOccurrencesOfString:@"." withString:@""];
    str=[str stringByReplacingOccurrencesOfString:@"_" withString:@""];
    str=[str stringByReplacingOccurrencesOfString:@" " withString:@""];
    str=[str stringByTrimmingCharactersInSet:[NSCharacterSet alphanumericCharacterSet]];

    if ([str isEqualToString:@""]) {
        NSLog(@"valid");
    }
    else {
        NSLog(@"invalid");
    }
 -1
Author: shivam,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2013-01-28 09:10:56