Re: NSTextField and NSNumberFormatter
Re: NSTextField and NSNumberFormatter
- Subject: Re: NSTextField and NSNumberFormatter
- From: "Louis C. Sacha" <email@hidden>
- Date: Thu, 19 Feb 2004 00:32:51 -0800
Hello...
NSNumberFormatter (and the rest of Apple concrete NSFormatter
subclasses) generally only validate the entered text when the user
takes some action that will end editing.
You will need to make a subclass of NSNumberFormatter, and override
the isPartialStringValid:newEditingString:errorDescription: method to
check the entered text each time the user enters a key.
- (BOOL)isPartialStringValid:(NSString *)partialString
newEditingString:(NSString **)newString errorDescription:(NSString
**)error
/* this validates the field's value as each key is entered into textfield */
{
/* validate the partial string */
NSDecimalNumber *check; /* used to hold temp value */
if ([self getObjectValue:&check forString:partialString
errorDescription:error]) {return TRUE;}
else
{
NSBeep();
return FALSE;
}
}
Once you have made your custom subclass of NSNumberFormatter, load
its header into InterfaceBuilder. You will need to drag an
NSNumberFormatter from the pallete to the window that shows the
objects in your nib (not over the NSTextField). Select your class in
the "Custom Class" pane of the inspector for that NSNumberFormatter
instance. You will need to make the "formatter" connection from your
NSTextField to this instance of NSNumberFormatter.
In order to allow only positive numbers, you simply need to set a
minimum value of 0 for the formatter, which you can do in one of the
standard NSNumberFormatter inspector panes in InterfaceBuilder, after
selecting the NSNumberFormatter that you dragged to your nib file.
Hope that helps,
Louis
Hello
I want NSTextField should only accept number and no other character.
For that I dropped NSNumberFormatter over NSTextField object in nib.
But while running I found that NSTextField accpet alphabet.
What is wrong ? Do I have to do something in code?
Can NSTextField be formatted to accpet only positive number?
Thanks in advance.
SBH
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