SpriteKit 自定义图片按钮

Example:ButtonSpriteNode*_fight=[[ButtonSpriteNodealloc]initWithImageName:@"fire_btn1.png"selected:@"fire_btn2.png"disable:@"fire_btn3.png"];_fight.position=CGPointMake(self.frame.size.width/2,self.frame.size.height/2);[_fightsetMethod:^(void){NSLog(@