含有按钮的ScrollView在iOS8中无法滚动的解决办法 | ScrollView with UIControl/UIButton subviews not scrollable under iOS 8

转自：https://zcw.me/blogwp/%E5%90%AB%E6%9C%89%E6%8C%89%E9%92%AE%E7%9A%84scrollview%E5%9C%A8ios8%E4%B8%AD%E6%97%A0%E6%B3%95%E6%BB%9A%E5%8A%A8%E7%9A%84%E8%A7%A3%E5%86%B3%E5%8A%9E%E6%B3%95-scrollview-with-uicontroluibutton-subv/转自：https://zcw.me/blogwp/%E5%90%AB%E6%9C%89%E6%