CALayer setNeedsDisplay can not work?

Question

My class is a CALayer subclass, and I have added a observer through NSNotificationCenter, when catching the message, it will run function like this:

- (void)setCurrentAutoValue:(NSNotification *) obj
{

     [self setNeedsDiaplay];
}

but this does not work, can anyone help?

Answer 1

Apparently, it is necessary to call setNeedsDisplay on the main thread. You can do this by using the performSelectorOnMainThread method. For example in your case:

[self performSelectorOnMainThread:@selector(setNeedsDisplay) withObject:0 waitUntilDone:NO];