Question

I’m getting some warnings that somethings may not respond to a function.

#import "Lane.h"
#import "TrafficController.h"


@implementation Lane
@synthesize controller;


-(void)awakeFromNib
{
    [controller registerLane:self]; -- 'TrafficController' may not respond to '-registerlane'
    srandom(time(NULL));
    [self start];
}

-(void)start
{
    long newStartTime = random() % 200;
    carStartTimer = [NSTimer scheduledTimerWithTimeInterval:newStartTime / 1000.0 target:self selector:@selector(startTimerFired:) userInfo:nil repeats:YES];
    [carStartTimer retain];
}

-(void)startTimerFired: (NSTimer*)timer
{
    //pick a random number of milliseconds to fire again at

    long newStartTime = random() % 1500 + 500;

    [timer setFireDate:[NSDate datewWithTimeIntervalSinceNow:newStartTime / 1000.0]];
    [controller startCarFromLane:self]; - 'TrafficController' may not respond to '-startCarFromLane'

    NSLog(@"Starting new car");
}

-(void)stop
{
    [carStartTimer invalidate];
    [carStartTimer release];
    carStartTimer = nil;
}

@end

Does it mean that those functions arent declared in this or other header file? Or does it mean something else?

Answer 1

In your TrafficController.h, do you have a line like:

-(void) registerLane: (type) variablename;

If you don’t, you should have