CODEWITHSUNDEEP
objective-ccocoa
aneuryzm
aneuryzm

Reputation: 64864

How can I forbid users to type numbers in a NSTextField?

How can I forbid users to type numbers in a NSTextField ?

I'm currently using a custom NSFormatter showing a popup after the users typed the value, but how can I prevent the inserting right after typing instead ?

thanks

I've tried this and it almost work.. but if I type a number and then some letters i.e. "24jdf" the letters are still displayed (even if removed when the field looses focus).

- (BOOL)isPartialStringValid:(NSString *)partialString newEditingString:(NSString **)newString errorDescription:(NSString **)error
//- (BOOL)getObjectValue:(id *)obj forString:(NSString *)string errorDescription:(NSString  **)error
{   

    if ([self numberFromString:partialString] == nil)
        return NO;

    return YES;
}

Upvotes: 0

Views: 151

Answers (1)

Francis McGrew
Francis McGrew

Reputation: 7272

You'll have to subclass your NSFormatter and override the following method:

-(BOOL)isPartialStringValid:(NSString **)partialStringPtr proposedSelectedRange:(NSRangePointer)proposedSelRangePtr originalString:(NSString *)origString originalSelectedRange:(NSRange)origSelRange errorDescription:(NSString **)error {
   NSString *string = *partialStringPtr;
   NSCharacterSet *numbers = [NSCharacterSet decimalDigitCharacterSet];
   return (NSNotFound == [string rangeOfCharacterFromSet:numbers].location);
}

Upvotes: 1

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