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NSTextField with Number Formatter not allowing decimal input
#import <Cocoa/Cocoa.h>

@interface AppDelegate : NSObject <NSApplicationDelegate> {
    IBOutlet NSTextField *number1;
    IBOutlet NSTextField *number2;
}

@property (assign) IBOutlet NSWindow *window;

@end

#import "AppDelegate.h"

@implementation AppDelegate

@synthesize window = _window;

-(void)controlTextDidChange:(NSNotification *) note {
    NSTextField *changedField = [note object];

    if (changedField == number1) {
        float num1 = [number1 floatValue];
        [number2 setFloatValue: (num1*2.0)];
    }

    if (changedField == number2) {
        float num2 = [number2 floatValue];
        [number1 setFloatValue: (num2/2.0)];
    }
}

@end

float num1 = [number1 floatValue];
[number2 setFloatValue: (num1*2.0)];

- (IBAction) textDidChange:(id)sender
{
   if (sender == number1)
   {
      float num1 = [number1 floatValue];
      [number2 setFloatValue: (num1*2.0)];
   }
   else if (sender == number2)
   {
      float num2 = [number2 floatValue];
      [number1 setFloatValue: (num2/2.0)];
   }
}