ios scrollView根据subviews 动态调整高度
核心代码如下
/**
CGRect contentRect = CGRectZero;
for (UIView *view in self.contentScrollView.subviews) {
contentRect = CGRectUnion(contentRect, view.frame);
}
contentRect.size.height = contentRect.size.height + 10;
self.contentScrollView.contentSize = contentRect.size;
*/