Question

I’m using a NSTimer to run an animation (for now just call it myMethod). However, its causing a crash.

Here’s the code:

@implementation SecondViewController


// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.


- (void) myMethod
{
    NSLog(@"Mark Timer Fire");

}


- (void)viewDidLoad
{ 
[super viewDidLoad];



NSLog(@"We've loaded scan");

[NSTimer scheduledTimerWithTimeInterval:2.0
                                 target:self
                               selector:@selector(myMethod:)
                               userInfo:nil
                                repeats:YES];

animationTimer = [NSTimer scheduledTimerWithTimeInterval: 1.0 target:self selector:@selector(myMethod:) userInfo:nil repeats: YES];


}

And here’s the output during the crash

-[SecondViewController myMethod:]: unrecognized selector sent to instance 0x4b2ca40
2012-06-21 12:19:53.297 Lie Detector[38912:207] * Terminating app due to uncaught exception ‘NSInvalidArgumentException’, reason: ‘-[SecondViewController myMethod:]: unrecognized selector sent to instance 0x4b2ca40’

So what am I doing wrong here?

Answer 1

either you can use only

- (void)myMethod: (id)sender
{
 // Do things
}

or you can do (remove : from both the method name)..

animationTimer = [NSTimer scheduledTimerWithTimeInterval: 1.0 target:self selector:@selector(myMethod) userInfo:nil repeats: YES];

hope this will help you