运行工程的时候会遇到 Safe Area Layout Guide before iOS9.0 这是因为xcode9 storyboard的设置里面多了 个 Safe Area Layout Guide,而这个特性只针对ios9 以后的版本,所以如果工程兼容ios9以前的话,加上这个选项就会报错,需要把这个选项去掉,如图
题目: Find the total area covered by two rectilinear rectangles in a 2D plane. Each rectangle is defined by its bottom left corner and top right corner as shown in the figure. Assume that the total area is never beyond the maximum possible value of int
如果你们的项目不做iOS9以下支持就打开main.storyboard 去除Use safe Area Layout 如果不考虑iOS9以下支持就按照下面的步骤 选中控制器,右边面板的Builds for 选择iOS9.0 and Later,如下图红框广为流传的错解是不勾选Use Safe Area Layout Guides,如下图灰框,会导致用不了iOS的这个新功能了