Wie kann ich Sonderzeichen in UITextField außer Punkt und Unterstrichen einschränken?

Wie kann ich Sonderzeichen in eine UITextField außer Punkt und Unterstriche?

Habe ich versucht das code-snippet unten, aber ohne Glück:

#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;
        }
}

InformationsquelleAutor der Frage Graham Bell | 2013-01-28

  1. 85

    Versuchen Sie code-block unten gegeben, es funktionierte gut für mich.

    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];
}

    Hoffe, es wird für Sie arbeiten.

    InformationsquelleAutor der Antwort Mrunal

  2. 3

    Versuchen, diese

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

    können Sie Ihren eigenen Satz mit 

    NSCharacterSet  *set= [NSCharacterSet characterSetWithCharactersInString:@"<all your symbols you want to ignore>"];

    InformationsquelleAutor der Antwort amar

  3. 3

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

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

    [TestResult evaluateWithObject:@"YourTestString"];

    Letzten return boolean-Wert true/false

    Methode

    + (BOOL) validateSpecialCharactor: (NSString *) text {
NSString *Regex = @"[A-Za-z0-9^]*";
NSPredicate *TestResult = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", Regex];
return [TestResult evaluateWithObject:text];
}

    InformationsquelleAutor der Antwort Indra

  4. 2

    Swift 2.2 basiert auf Mrunal Antwort:

    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;

}

    InformationsquelleAutor der Antwort Evdzhan Mustafa

  5. 2

    Swift 3.1 Lösung

    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)
    }

    InformationsquelleAutor der Antwort Sourabh Sharma

  6. 1

    Dies kann helfen, Sie versuchen, diese.. und lasst mich bitte wissen,

    -(BOOL)isHaveSpecialChar:(NSString*)str{
NSString *customStr = @"~`!@#$%^&*()+=-/;:\"\'{}[]<>^?, ";
NSCharacterSet *alphaSet = [NSCharacterSet characterSetWithCharactersInString:customStr];
BOOL isHaveSpecialChar = [[str stringByTrimmingCharactersInSet:alphaSet] isEqualToString:@""];
return !isHaveSpecialChar;
}

    InformationsquelleAutor der Antwort SachinVsSachin

  7. 0
    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;

    InformationsquelleAutor der Antwort GOWTHAM

  8. 0

    Swift 4

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

    UITextField delegieren Methode:

    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
}

    InformationsquelleAutor der Antwort Sunil Targe

  9. -1

    Versuchen Sie dies:

    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");
    }

    InformationsquelleAutor der Antwort shivam

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