摘要：
1、UIDeviceOrientationUIDeviceOrientation的定义在UIDevice.h中，它的定义如下：// UIDevice.h...typedef NS_ENUM(NSInteger, UIDeviceOrientation) { UIDeviceOrientationUnknown, UIDeviceOrientationPortrait, // Device oriented vertically, home button on the bottom UIDeviceOrientationPortraitUpsideDown, // Dev... 阅读全文
