UIDeviceOrientation * orientation = [UIDevice currentDevice] .orientation;得到一個'不兼容的類型初始化'錯誤

Question

誰能告訴我爲什麼這行會拋出一個不兼容的類型錯誤？

UIDeviceOrientation *orientation = [UIDevice currentDevice].orientation; 

Answer 1

它不是返回一個指針：

UIDeviceOrientation orientation = [UIDevice currentDevice].orientation;