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"Controller Cannot Be nil" on binding NSTextField

Subject: "Controller Cannot Be nil" on binding NSTextField
From: Johnny Lundy <email@hidden>
Date: Mon, 12 May 2008 21:01:09 -0400
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I am stuck on this error. 2008-05-12 20:58:58.257 TimerTest[65919:10b] An uncaught exception was raised 2008-05-12 20:58:58.259 TimerTest[65919:10b] Controller cannot be nil 2008-05-12 20:58:58.260 TimerTest[65919:10b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Controller cannot be nil'

My code is to make a countdown timer, displayed in 3 NSTextFields for the hours, minutes and seconds.

The code works fine, as you see in the log output below.

However, when I bind one of the NSTextFields to any of the properties hours, minutes, seconds, or their string equivalents through an instance of my class, I get the runtime error "controller cannot be nil" and the nib does not load. It loads fine if I uncheck that binding.

IB: three text fields, no controllers, one NSObject (deadline) with class of Deadline to instantiate the class. Text fields attempted to bind their value to properties of this instance, e.g., deadline.hours or deadline.minutes.

Code:

//  Deadline.h
#import <Cocoa/Cocoa.h>

@interface Deadline : NSObject
{
	NSTimeInterval timeToDeadline, deadlineHours;
	NSTimer *deadlineTimer;
	NSCalendarDate *startTime, *endTime;
	int hours, minutes, seconds;
	NSString *hoursString, *minutesString, *secondsString;
}
@property (readwrite) NSTimeInterval timeToDeadline;
@property (readwrite) NSTimeInterval deadlineHours;
@property (readwrite, copy) NSCalendarDate *startTime;
@property (readwrite, copy) NSCalendarDate *endTime;
@property (readwrite) int hours;
@property (readwrite) int minutes;
@property (readwrite) int seconds;
@property (readwrite, copy) NSString *hoursString;
@property (readwrite, copy) NSString *minutesString;
@property (readwrite, copy) NSString *secondsString;
@end

//  Deadline.m
#import "Deadline.h"

@implementation Deadline @synthesize timeToDeadline, deadlineHours, startTime, endTime, hours, minutes, seconds, hoursString, minutesString, secondsString;

- (void) init { deadlineTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateTime:) userInfo:nil repeats:YES]; self.deadlineHours = 24; self.startTime = [NSCalendarDate calendarDate]; //Current date self.endTime = [startTime dateByAddingYears:0 months:0 days:0 hours:self.deadlineHours minutes:0 seconds:0]; }

- (void) updateTime:aTimer { [self.endTime years:NULL months:NULL days:NULL hours:&hours minutes:&minutes seconds:&seconds sinceDate:[NSCalendarDate calendarDate]]; NSLog(@"Time Left: Hours: %d Minutes:%d Seconds:%d\n", hours, minutes, seconds); self.hoursString = [[NSNumber numberWithInt: self.hours] stringValue]; } @end

[Session started at 2008-05-12 20:25:45 -0400.] 2008-05-12 20:25:46.943 TimerTest[65851:10b] Time Left: Hours: 23 Minutes:59 Seconds:58 2008-05-12 20:25:47.943 TimerTest[65851:10b] Time Left: Hours: 23 Minutes:59 Seconds:57 2008-05-12 20:25:48.943 TimerTest[65851:10b] Time Left: Hours: 23 Minutes:59 Seconds:56

I Googled this error and the only thing that came up was a guy totally re-built his nib file and the error went away.

Has anyone seen this?
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