当我尝试NSLog iPad的方向时，为什么我会得到整数值？

Question

只是想知道为什么当我尝试记录iPad的方向时我会得到整数值。是否有资源告诉我每个值的含义？我已经得到了从1到8的任何东西。我只认为有4种可能的方向，所以我很困惑。

Answer 1

我不知道考虑到文档中的8个不同的值显示

typedef enum { 
    UIInterfaceOrientationPortrait   = UIDeviceOrientationPortrait, 
    UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown, 
    UIInterfaceOrientationLandscapeLeft  = UIDeviceOrientationLandscapeRight, 
    UIInterfaceOrientationLandscapeRight  = UIDeviceOrientationLandscapeLeft 
} UIInterfaceOrientation; 

您登录的方向，看看它是之前，您可以登录这一权利。

NSLog(@"UIInterfaceOrientationPortrait-%d\n\ 
UIInterfaceOrientationPortraitUpsideDown-%d\n\ 
UIInterfaceOrientationLandscapeLeft-%d\n\ 
UIInterfaceOrientationLandscapeRight-%d", UIInterfaceOrientationPortrait, UIInterfaceOrientationPortraitUpsideDown, UIInterfaceOrientationLandscapeLeft, UIInterfaceOrientationLandscapeRight); 

有方便的方法来测试特定的方向，例如

UIInterfaceOrientationIsLandscape 
Returns a Boolean value indicating whether the user interface is currently presented in a landscape orientation. 

#define UIInterfaceOrientationIsLandscape(orientation) \ 
    ((orientation) == UIInterfaceOrientationLandscapeLeft || \ 
    (orientation) == UIInterfaceOrientationLandscapeRight)