仿天猫淘宝首页菜单滑动效果
pageControl的偏移量为pageControl的总宽度减去滑块的总宽度,
同理scrollView的偏移量为scrollView的内容宽度减去scrollView的宽度。
通过比例计算可得出pageControl的偏移量,
即offsetX:scrollView可偏移的总距离=x:pageControl可偏移的总距离
整理得x = offsetX*pageControl可偏移的总距离/scrollView可偏移的总距离
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