targets->Build Phases->Compile Sources
arc---非arc：将該檔案的Compiler Flags編輯為：-fno-objc-arc
非arc---arc：将給檔案的Compiler Flags編輯為：-fobjc-arc
targets->Build Phases->Compile Sources
arc---非arc：将該檔案的Compiler Flags編輯為：-fno-objc-arc
非arc---arc：将給檔案的Compiler Flags編輯為：-fobjc-arc
![吃透MVC，馴服爛代碼 吃透MVC，馴服爛代碼[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)