Change background color for page control

问题:

Is there any way to change background color of page control in tvOS?

NOTE: i want to set background color as clear color

I have try the below code, but it is not working in tvOS.

var pageControl : UIPageControl!
pageControl = UIPageControl(frame: CGRectMake(0, self.view.frame.height - 200, self.view.frame.width, 50))
pageControl.pageIndicatorTintColor = UIColor(red: 255/255, green: 255/255, blue: 255/255, alpha: 0.70)
pageControl.currentPageIndicatorTintColor = UIColor.whiteColor()
pageControl.backgroundColor = UIColor.clearColor()
pageControl.opaque = false
pageControl.numberOfPages = 10
pageControl.currentPage = 0

Thanks in advance.

回答1:

This transparent background is a subview in UIPageControl of type UIVisualEffectView. You could remove it like this:

for subview in pageControl.subviews {
  if subview.isKindOfClass(UIVisualEffectView) {
    subview.removeFromSuperview()
  }
}

回答2:

@alexander-johmann above has a solution (though I'd like to find another way).

Ideally it would be better to be able to set the actual background color. This solution doesn't really do that; it removes elements of the UIPageControl to get the 'effect' of providing a clear background without actually doing so.

Here is an objective-c version of the same code:

for (UIView *subview in pageControl.subviews) {
    if ([subview isKindOfClass:[UIVisualEffectView class]] == YES) {
        [subview removeFromSuperview];
    }
}