UIDeviceOrientation * orientation = [UIDevice currentDevice] .orientation;得到一个'不兼容的类型初始化'错误

Question

谁能告诉我为什么这行会抛出一个不兼容的类型错误？

UIDeviceOrientation *orientation = [UIDevice currentDevice].orientation; 

Answer 1

它不是返回一个指针：

UIDeviceOrientation orientation = [UIDevice currentDevice].orientation;