Count and remove Subviews from view in ios - iphone

Question

this is the way I create and add subviews into a view.
I'm wondering why the count always returns 0, when it should return "hundreds". What am I doing wrong, thanks!
I have added more code where shows clearly my issue. I copy/pasted all functions involved on my initial question.
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.contenedor addSubview:vistaPanelBotones];
[self crearBotones];
}
- (void) crearBotones {
UIColor *colores[] = {
[UIColor blueColor],
[UIColor brownColor],
[UIColor redColor],
[UIColor orangeColor],
[UIColor greenColor],
[UIColor yellowColor],
[UIColor purpleColor],
[UIColor blackColor],
[UIColor whiteColor],
[UIColor darkGrayColor],
[UIColor magentaColor],
[UIColor cyanColor],
};
int indice = 0;
for (int col = 0; col < self.vistaPanelBotones.frame.size.width ; col=col+20) {
for (int fila = 0; fila < self.vistaPanelBotones.frame.size.height-20 ; fila = fila+20) {
CGRect frame = CGRectMake(col, fila, 20, 20);
Boton *boton = [Boton new];
boton.frame = frame;
boton.layer.backgroundColor = colores[(fila + col) % 7].CGColor;
boton.layer.cornerRadius = 0.25;
boton.layer.borderWidth = 0.25;
boton.layer.borderColor = [UIColor whiteColor].CGColor;
boton.layer.delegate = self;
[self.vistaPanelBotones addSubview:boton];
[boton setNeedsDisplay];
}
indice++;
}
NSLog(#"Vista Botones SubViews:%i",[[self.vistaPanelBotones subviews] count]);
}
- (IBAction)reiniciar:(id)sender {
if (self.vistaPanelBotones == nil){
NSLog(#"no existe la vista");
}
NSUInteger count = self.vistaPanelBotones.subviews.count;
NSLog(#"Vista SubViews: %i",count);
}

Answer 1

Here are a few of my thoughts:
I would check if self.vistaPanelBotones is non-nil, just in case (if it were nil, you would not get any errors in that code, but also no subviews).
Possibly executing this before you have a valid frame (IIRC, viewWillAppear is the earliest callback with valid geometry)
I'm pretty sure if boton was nil you would get an exception when adding as a subview, but it's another test worth using for debugging.

Answer 2

Use [[self.vistaPanelBotones subviews] count] to count the number of subviews, but there is an elegant way to remove all subviews from a view in Objective-C. Try this:
[[self.vistaPanelBotones subviews] makeObjectsPerformSelector:#selector(removeFromSuperView];