[3R1C]

I have a textfield in which i only allow the user to type a single letter. I need to format this single letter after its typed into uppercase. so if the user types "t" what actually gets put into the textField is "T". Ive subclassed NSFormatter and it sort of works but not really. When I type "t" it doesnt change appear as "T" UNLESS I hit tab. I discovered this accidently. When i hit tab te focus doesnt change to anywhere else, my t just turns into T. Heres my formatter code.

any ideas?


- (id)init {
if (self = [super init]) {
crappyCharacterSet = [[[NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklm nopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"] invertedSet] retain];
return self;
}
return nil;
}

- (NSString *)stringForObjectValue:(id)anObject {
return [anObject uppercaseString];
}

- (BOOL)getObjectValue:(id *)anObject forString:(NSString *)string errorDescription:(NSString **)error {
if (error) {
*error = @"error";
}
*anObject = string;
return YES;
}

- (BOOL)isPartialStringValid:(NSString *)partialString newEditingString:(NSString **)newString errorDescription:(NSString **)error {
if (([partialString containsCharacterInSet:crappyCharacterSet]) || ([partialString length] > 1)) {
NSBeep();
return NO;
}
*newString = partialString;
return YES;

}

- (void)dealloc {
[crappyCharacterSet release];
[super dealloc];
}

@end

[techtrucker]

I don't know about NSFormatter really, but in one of my apps I had the need to do something as soon as a user typed in a text field, I used a notification center and :

- (void)controlTextDidChange:(NSNotification *)aNotification

Sorry if that's no help...

[bewebste]

To have the field replace the string as it's typed, you need to pass back the corrected string from the partial string validation method. So, instead of:

Code:
*newString = partialString;

you should have

Code:
*newString = [partialString uppercaseString];

[3R1C]

That was part of it. I also needed to return No instead of Yes.