CODEWITHSUNDEEP
iphoneselector
user349302
user349302

Reputation: 3811

IPhone performSelector issue

I have working code: [self performSelector:@selector(doSomething) ];

but when I change this line to:

[self performSelector:@selector(doSomething) withObject:nil afterDelay:1.0];

it reports error - unrecognized selector....

could you tell me what is the problem in?

thank you

Upvotes: 1

Views: 1047

Answers (3)

Brandon A
Brandon A

Reputation: 926

Is self still around? You could be trying to send a message to an NSZombie.

Upvotes: 0

Dad
Dad

Reputation: 6478

If you changed your method to take an object parameter then you need to change the @selector() argument to include the ":", e.g., @selector( doSomething: )

This works:

- (void) foo
{
    NSLog(@"foo!");
}


- (void)applicationDidFinishLaunching:(NSNotification *)aNotification 
{        
    [self performSelector: @selector(foo) withObject: nil afterDelay: 0.1];
}

So you can pass a selector that takes no param to performSelector:withObject:afterDelay: and I presume it ignores the withObject: param which I wasn't 100% sure of.

Upvotes: 5

Jeff Kelley
Jeff Kelley

Reputation: 19071

It looks like your problem is that your selector is doSomething and not doSomething:. Without the :, there's nowhere in the message to insert an object, even nil.

Upvotes: 1

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