ios - 在 iPad 上禁用手写笔滚动

Question

如果 UIScrollView 来自手写笔（Apple Pencil），我正在尝试取消滚动。

有什么建议吗？

Answer 1

您可以allowedTouchTypes在 UIGestureRecognizer 上设置属性。

例如：

scrollView.panGestureRecognizer.allowedTouchTypes = [UITouchType.direct.rawValue as NSNumber]

Answer 2

您可以使用 UITouch 的类型来确定触摸是否来自手指的手写笔。

if (touch.type == UITouchTypeStylus) {
     //its touch from Stylus.
}

现在，对于滚动视图，您可以创建 UIScrollview 的子类并实现 TouchBegan 方法

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{
    UITouch *touch = [[event allTouches] anyObject];
    if (touch.type == UITouchTypeStylus) {
       self.scrollEnabled = NO;
     }
    else
    {
       self.scrollEnabled = YES;
    }
    [super touchesBegan:touches withEvent:event];

}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    if (touch.type == UITouchTypeStylus) {
      self.scrollEnabled = NO;
    }
    else
   {
      self.scrollEnabled = YES;
   }
   [super touchesMoved:touches withEvent:event];

}

// 编辑或

子类 UIApplication ：

 @interface MyUIApplication : UIApplication
  - (void)sendEvent:(UIEvent *)event {

        [super sendEvent:event];
        NSSet *allTouches = [event allTouches];
        if ([allTouches count] > 0) {

             / 
             UITouchPhase phase = ((UITouch *)[allTouches anyObject]).phase;
             if (phase == UITouchPhaseBegan){

                   UITouch *touch = [allTouches  anyObject];


                if (touch.type == UITouchTypeStylus) {


                   [[NSNotificationCenter defaultCenter] postNotificationName:@"DisableScroll"  object:self];
                 }
               else
                {

                   [[NSNotificationCenter defaultCenter] postNotificationName:@"EnableScroll"  object:self];
                 }
             }

        }
    }
    @end




int main(int argc, char *argv[])
    {
          @autoreleasepool {
                return UIApplicationMain(argc, argv, NSStringFromClass([MyUIApplication class]), NSStringFromClass([AppDelegate class]));
          }
    }

在包含滚动视图的类中添加这些通知的观察者并相应地启用/禁用滚动。