• (void)initSwipeGesture{

  //左滑
  self.left=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipes:)];
  self.left.direction=UISwipeGestureRecognizerDirectionLeft;
  [self.view addGestureRecognizer:self.left];
  
  //右滑
  self.right=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipes:)];
  self.right.direction=UISwipeGestureRecognizerDirectionRight;
  [self.view addGestureRecognizer:self.right];

  }

pragma mark - Action Methods

• (void)handleSwipes:(UISwipeGestureRecognizer *)sender{
  if (sender.direction == UISwipeGestureRecognizerDirectionLeft){

     self.imageView.hidden = YES;
     self.scrollView.hidden = NO;
     [self.timer invalidate];
     self.num --;
     _page --;
     [self changePoint];
     [self.playBtn setImage:[UIImage imageNamed:@"play"] forState:UIControlStateNormal];
     DMLog(@"left");

  }
  if (sender.direction == UISwipeGestureRecognizerDirectionRight) {

     self.imageView.hidden = YES;
     self.scrollView.hidden = NO;
     [self.timer invalidate];
     self.num ++;
     _page ++;
     [self changePoint];
     [self.playBtn setImage:[UIImage imageNamed:@"play"] forState:UIControlStateNormal];
     DMLog(@"right");

  }
  }

怎么让他一直监听执行下面handleSwipes的方法

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手势本身添加了之后会一直监听，除非你移除掉手势。而没有调用识别的手势处理方法，可能因为手势冲突或者其他原因。你可以设置一下手势识别的delegate，实现代理方法，查看一下手势识别状态。