On your storyboard page, go to File Inspector and uncheck 'Use Size Classes'. This should shrink your view controller to regular IPhone size you were familiar with. Note that using 'size classes' will let you design your project across many devices. Once you uncheck this the Xcode will give you a warning dialogue as follows. This should be self-explainatory.
"Disabling size classes will limit this document to storing data for a single device family. The data for the size class best representing the targeted device will be retained, and all other data will be removed. In addition, segues will be converted to their non-adaptive equivalents."
在Storyboard页面中,通过禁用'UseSizeClasses'选项,将视图控制器调整回常规iPhone尺寸,便于熟悉操作。此操作将提示限制项目文件只存储单一设备家族的数据,并转换分段过渡为非适应版本。

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