Error "Wrong type argument to unary minus"

jayboy · 05-09-2011, 04:17 PM

Hi guys, I've been getting getting the error "Wrong type argument to unary minus" and I can't seem to make it disappear.

Please help!

Code:

- (IBAction)toggleTracking

{
	if (tracking)
        
	{
		tracking = NO;
		
		[[UIApplication sharedApplication] setIdleTimerDisabled:NO];
		startButton.title = @"Start Tracking";
		[locationManager stopUpdatingLocation];
		[locationManager stopUpdatingHeading];
		mapView.scrollEnabled = YES;
		mapView.zoomEnabled = YES;
    
		
		
		
		//--NSTimeInterval *
        
        //--double *time = (double)[startDate timeIntervalSinceNow];
		
		//float timeF = 5678; //(float)*time;
		
		//NSString *message = [NSString stringWithFormat:@"Distance: %.02f km, %.02f mi\nSpeed: %.02f km/h, %.02f mph", distance / 1000.0, distance * 0.00062, distance * 3.6 / timeF, distance * 2.2369 / timeF];
    
        float time = -[startDate timeIntervalSinceNow];
        
        NSString *message = [NSString stringWithFormat:
                             @"Distane: %.02f km, %.02f mi\nSpeed: %.02f km/h, %.02f mph",
                             distance / 1000, distance * 0.00062, distance * 3.6 /time,
                             distance * 2.2369 / time];
        
		UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Statistics" message:message delegate:self cancelButtonTitle:@"Return" otherButtonTitles:nil];
		[alert show];
		[alert release];
	}

Been getting the error on the line where it says -- float time = -[startDate timeIntervalSinceNow];

Thanks in advance

Domele · 05-09-2011, 08:42 PM

I fail to see how this is an advanced topic. Just so you know, I think less people look at the advanced discussion page than the regular page. Anyways just remove the *, so it'll be

Code:

double time =

jayboy · 05-10-2011, 05:47 AM

Quote:

Originally Posted by Domele

I fail to see how this is an advanced topic. Just so you know, I think less people look at the advanced discussion page than the regular page. Anyways just remove the *, so it'll be

Code:

double time =

Sorry, im new to this forum.
I've tried removing it but im still getting the same error.
I'm getting the error on the line where it says:

Code:

float time = -[startDate timeIntervalSinceNow];

dany_dev · 05-10-2011, 05:56 AM

NSTimeInterval time = [startDate timeIntervalSinceNow];

jayboy · 05-10-2011, 07:29 AM

Im still getting an error :S HELP!!!

Domele · 05-10-2011, 05:20 PM

What is the error? Dany_dev's solution should of worked.

iSDK · 05-10-2011, 05:21 PM

Quote:

Originally Posted by jayboy

Sorry, im new to this forum.
I've tried removing it but im still getting the same error.
I'm getting the error on the line where it says:

Code:

float time = -[startDate timeIntervalSinceNow];

Do you mean:

Code:

float time -= [startDate timeIntervalSinceNow];

jayboy · 05-10-2011, 05:43 PM

Quote:

Originally Posted by iSDK

Do you mean:

Code:

float time -= [startDate timeIntervalSinceNow];

I've tried doing that but it doest work :S

jayboy · 05-10-2011, 05:48 PM

Quote:

Originally Posted by Domele

What is the error? Dany_dev's solution should of worked.

Tried that too i'm afraid. No luck! :S

I've uploaded my application in case any one wants to take a look at it.
Here is the link:
TrackUrRouteFinal.zip

iSDK · 05-10-2011, 05:50 PM

Quote:

Originally Posted by jayboy

Tried that too i'm afraid. No luck! :S

I've uploaded my application in case any one wants to take a look at it.
Here is the link:
TrackUrRouteFinal.zip

NSData doesn't have the variable: timeIntervalSinceNow. Thats why you are receiving the error.

jayboy · 05-10-2011, 05:52 PM

Quote:

Originally Posted by iSDK

NSData doesn't have the variable: timeIntervalSinceNow. Thats why you are receiving the error.

So whats the solution? NSDate is it?

iSDK · 05-10-2011, 05:54 PM

Quote:

Originally Posted by jayboy

So whats the solution? NSDate is it?

That would be correct.

jayboy · 05-10-2011, 06:08 PM

I think I've solved it. Thanks everyone for their effort.
One last thing. To test Core Location does the app need to be on the phone?
Doubt i can test it with simulator since my mac book doesn't have GPS?

**JasonR** · 05-10-2011, 06:46 PM

You can do basic tests of Core Location in the Simulator, but you will always be standing still, so you need a device to get any real testing done.

jayboy · 05-11-2011, 09:22 AM

Quote:

Originally Posted by JasonR

You can do basic tests of Core Location in the Simulator, but you will always be standing still, so you need a device to get any real testing done.

Thanks dude