UIScrollView无法滚动的解决办法
UIScrollView常用属性
UIScrollView和delegate属性
// 设置UIPageControl图片(KVC)
[self.pageControl setValue:[UIImage imageNamed:@"current"] forKeyPath:@"_currentPageImage"];
[self.pageControl setValue:[UIImage imageNamed:@"other"] forKeyPath:@"_pageImage"];
