禁用iPad上的手写笔滚动

Question

我正在尝试在uiscrollview上取消滚动，如果它来自手写笔(苹果铅笔(。

有任何建议？

Answer 1

您可以在uigesturerecognizer上设置 allowedTouchTypes属性。

例如：

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

Answer 2

您可以找出触摸是否来自Fingure Usinng Uitouch的类型。

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

现在，对于ScrollView，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。