iOS 14 UIPageControl crash

iOS 14  上 ，必现：

[self.pageControl setValue:[UIImage imageNamed:@"cccc"]   forKeyPath:@"pageImage"];

[self.pageControl setValue:[UIImage imageNamed:@"bbbbb"]    forKeyPath:@"currentPageImage"];

解决方式 如下：

   if(@available(iOS14, *) ){

       self.pageControl.currentPageIndicatorTintColor = [UIColor colorWithHexString:@"#500000"];

       self.pageControl.pageIndicatorTintColor = UIColor.whiteColor;

   }else{

      [self.pageControl setValue:[UIImage imageNamed:@"cccc"]    forKeyPath:@"pageImage"];

     [self.pageControl setValue:[UIImage imageNamed:@"bbbbb"]   forKeyPath:@"currentPageImage"];

    }