UIPageControl设置图片

UIPageControl *pageControl = [[UIPageControl alloc] init];
 // 设置内部的圆点图片
[pageControl setValue:[UIImage imageNamed:@"compose_keyboard_dot_normal"] forKeyPath:@"pageImage"];
[pageControl setValue:[UIImage imageNamed:@"compose_keyboard_dot_selected"] forKeyPath:@"currentPageImage"];