NSTimer Category + Blocks implementation to replace selector

Question

I am quite new to blocks and objective-c, and i am trying to write my first category using both. My idea is to create a category on NSTimer that will receive a block as a pa

Answer 1

This should work:

NSTimer* timer = [[NSTimer alloc] initWithFireDate:[NSDate date] 
                                          interval:theSeconds
                                            target:timer
                                          selector:@selector(theBlock) 
                                          userInfo:nil 
                                           repeats:repeats];

The problem is that you're setting the target of the new NSTimer instance to be self. However, in the context of + scheduleTimerWithTimeInterval:repeats:actions: (notice the +), self is NSTimer, and not (as you probably thought) your newly-created NSTimer instance.

As you can see from the error message, your app is crashing because NSTimer doesn't respond to the class method + theBlock, which is of course correct since you only defined the instance method - theBlock.