Main Scene and Game State - Learn SpriteBuilder for iOS Game Development - page 221

11. For both Normal State and Highlighted State , change the Sprite frame

property to the <NULL> item. This removes the button's background im-
ages. It is now an invisible button.

12. The size of the button will be a bit too small. Change the button's Pre-

ferred size property to 60x60.

You now have two invisible buttons on both the play and settings sprites. The fact that the
buttons rotate along with the sprites won't matter much since the buttons are square and
cover the sprite's circular-shaped images well enough, regardless of rotation. Though you
could, of course, apply the same reverse-animation trick you used for the sprite's labels.

Connecting the Buttons

To connect the buttons with selectors, switch to the Item Code Connections tab. Then se-
lect each button in order and, in the Selector field, enter shouldPlayGame for the play
button and shouldShowSettings for the settings button.
There's one more thing missing though. The selectors need to be sent somewhere, and that
somewhere is the Document root . This term refers to the root node of the MainMenuBut-
tons.ccb . Select its root node, and enter MainMenuButtons in the Custom class field.
Now open the Xcode project and add a new Objective-C class. Do so as described in
Chapter 2 , Figure 2-9 and following. The class' name must be MainMenuButtons , and
it should be a subclass of CCNode .
Edit the MainMenuButtons.m file to add the methods in Listing 7-2 .

Listing 7-2 . Testing that the button selectors work

#import "MainMenuButtons.h"
@implementation MainMenuButtons
-(void) shouldPlayGame
{

NSLog(@"PLAY");

}
-(void) shouldShowSettings
{

NSLog(@"SETTINGS”);

}
@end