[pageControl setValue:[UIImage imageWithName:@"selected"] forKeyPath:@"_currentPageImage"];
[pageControl setValue:[UIImage imageWithName:@"normal"] forKeyPath:@"_pageImage"];
[pageControl setValue:[UIImage imageWithName:@"selected"] forKeyPath:@"_currentPageImage"];
[pageControl setValue:[UIImage imageWithName:@"normal"] forKeyPath:@"_pageImage"];
本文标题：替换UIPageControl的点为图片
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