如图:
UIScrollViewd property.png
![Uploading scrollView3_917006.png . . .]
scrollView3.png
设置pageController 为图片的方法
// 2.设置pageControl的图片
[self.pageControl setValue:[UIImage imageNamed:@"current"] forKeyPath:@"_currentPageImage"];
[self.pageControl setValue:[UIImage imageNamed:@"other"] forKeyPath: @"_pageImage"];
