UIScrollView 从右向左反向模式 适配阿拉伯语系

问题：针对UIScrollView，我们需要怎么修改，使它以反向模式滚动，来适配阿拉伯语系。

方案：可以通过对scrollView、以及其上的子视图，分别作180变换实现：

self.scrollView.transform = CGAffineTransformMakeRotation(M_PI);
subView.transform =  CGAffineTransformMakeRotation(M_PI);

参考：

UIScrollView Direction RTL for Right to Left Languages

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Can we change the behavior of UIScrollView that it scrolls RTL content in it's reverse mode？

You can achieve it by rotating UIScrollView in Child views by 180 (Pi).
self.scrollView.transform = CGAffineTransformMakeRotation(M_PI);
subView.transform =  CGAffineTransformMakeRotation(M_PI);