UILabels animation called by delegate/protocols structure - delegates

Question

I want to use a little animation for my labels.
If I try to call this animation from a IBAction button or ViewDidLoad and all work correctly.
- (void)animateLabelShowText:(NSString*)newText characterDelay:(NSTimeInterval)delay
{
[self.myLabel setText:#""];
for (int i=0; i<newText.length; i++)
{
dispatch_async(dispatch_get_main_queue(),
^{
[self.myLabel setText:[NSString stringWithFormat:#"%#%C", self.myLabel.text, [newText characterAtIndex:i]]];
});
[NSThread sleepForTimeInterval:delay];
}
}
called by:
-(void) doStuff
{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0),
^{
[self animateLabelShowText:#"Hello Vignesh Kumar!" characterDelay:0.5];
});
}
But if I put this method in a protocol and I try to call it from for example a delegate nothing appears. There's probably I missing something in the GDC (Grand Central Dispatch) logics:
...
if ([_myDelegate respondsToSelector:#selector(doStuff:)])
{
NSLog(#" Yes I'm in and try to execute doStuff..");
[_myDelegate doStuff]; // NOTHING TO DO
}
...
The same situation happened when I change my function doStuff with any similar function like:
-(void)typingLabel:(NSTimer*)theTimer
{
NSString *theString = [theTimer.userInfo objectForKey:#"string"];
int currentCount = [[theTimer.userInfo objectForKey:#"currentCount"] intValue];
currentCount ++;
NSLog(#"%#", [theString substringToIndex:currentCount]);
[theTimer.userInfo setObject:[NSNumber numberWithInt:currentCount] forKey:#"currentCount"];
if (currentCount > theString.length-1) {
[theTimer invalidate];
}
[self.myLabel setText:[theString substringToIndex:currentCount]];
}
called by
-(void) doStuff
{
NSString *string =#"Risa Kasumi & Yuma Asami";
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
[dict setObject:string forKey:#"string"];
[dict setObject:#0 forKey:#"currentCount"];
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:#selector(typingLabel:) userInfo:dict repeats:YES];
[timer fire];
}

Answer 1

I've solved using NSNotificationCenter in my delegate file .m
in viewDidLoad:
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(makeEffectOnMyLabel:) name:#"lblUpdate" object:nil];
in my protocol function :
dispatch_async( dispatch_get_main_queue(),
^{
...I've populated a dictionary userInfo with my vars
[[NSNotificationCenter defaultCenter] postNotificationName:#"lblUpdate" object:nil userInfo:userInfo];
});
in a function created to prepare typingLabel
-(void) makeEffectOnMyLabel:(NSNotification *) notification
{
..changes between dictionaries to prepare typingLabel..
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
NSDictionary* userInfo = [notification userInfo];
[dict setObject:[userInfo objectForKey:#"myRes"] forKey:#"myRes"];
[dict setObject:[userInfo objectForKey:#"myType"] forKey:#"myType"];
[dict setObject:[userInfo objectForKey:#"frase"] forKey:#"frase"];
[dict setObject:#0 forKey:#"currentCount"];
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:#selector(typingLabel:) userInfo:dict repeats:YES];
[timer fire];
}
Now all work correct.