UIPageControl *pageControl;
[pageControl setValue:[UIImage imageNamed:@"默认图片"]forKeyPath:@"pageImage"];
[pageControl setValue:[UIImage imageNamed:@"当前点的图片"]forKeyPath:@"currentPageImage"];
UIPageControl *pageControl;
[pageControl setValue:[UIImage imageNamed:@"默认图片"]forKeyPath:@"pageImage"];
[pageControl setValue:[UIImage imageNamed:@"当前点的图片"]forKeyPath:@"currentPageImage"];