Connect an NSNumberFormatter to NSTextfield

Question

I am trying to connect an NSNumberFormatter to an NSTextfield using the formatter outlet of an NSTextField (shown in image below). My formatter subclass is as follows:

#import <Foundation/Foundation.h>

@interface FieldFormatter : NSNumberFormatter

@end

#import "FieldFormatter.h"

@implementation FieldFormatter

- (NSNumberFormatterBehavior)formatterBehavior {
    return NSNumberFormatterBehavior10_4;
}

- (NSNumberFormatterStyle)numberStyle {
    return NSNumberFormatterDecimalStyle;
}

@end

I get no errors when I run the program but the formatter is not working as it should. When I type a decimal into the text field it rounds up, i.e. 13.8 becomes 14. I can't input decimals at all into the text field.

I can get this to work correctly when using an NSTextField with NSNumberFormatter in Interface Builder. But I would prefer to do this through code so I can have more control over the format.

So what I'm trying to do is this - Subclass NSNumberFormatter, connect the formatter to text fields in the XIB, then after the user inputs a number into a text field that number is formatted.

Any suggestions would be helpful.

Answer 1

Alloc init your formatter, and then just call setFormatter: on your text field.

FieldFormatter *formatter = [[FieldFormatter alloc] init];
[myTextField setFormatter:formatter];

And, if you're not doing anything with it in IB, you should get rid of that connection and the blue cube that represents your FieldFormatter instance.