ios - 对持续触摸采取行动，而不是仅在触摸开始时采取行动 :

Question

我正在编写一个游戏，当用户触摸屏幕的左侧或右侧时，“持续水平”会增加。目前只有当用户第一次触摸屏幕时才会增加(我的代码在下面)。只要用户将手指放在屏幕上，我就希望应用增加。我必须做什么？

-(void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event{
      UITouch *touch = [touches anyObject];
      CGPoint touchPoint = [touch locationInView:self.view];

      if (self.x >= touchPoint.x){
          self.sustain += 1;

      }else if (self.x <= touchPoint.x){
          self.sustain += 1;

      }
}

Answer 1

increased.Currently the sustain level only increase when you first touch the screen, I want the force to be applied for as long as the user holds their finger on the screen

当用户保持手指不动时，您不会收到任何消息；您的下一条消息将是 touchesEnded。因此，您需要启动一个计时器，并在每次计时器触发时根据需要不断增加力，直到您获得touchesEnded。