iPhone在应用启动时获取设备方向

Question

How can i get the device orientation in applicationDidFinishLaunching() method. I have tried UIDevice deviceorientation and StatusbarOrientaion . Both returns incorrect values (same orientation value irrespective of the current orienation).

Basically, I'm trying to load an image based on the device orientation till the app(webview) completes loading. So i thought i can determine the current orientation here and load an appropriate image (out of 4 images, one for each orientation).

BTW, I have added the supported interface orientations in the plist file.

Please let me know if you require any other information for you to properly address this question.

Thanks

Answer 1

The value of UIDevice orientation is invalid until you call beginGeneratingDeviceOrientationNotifications

http://developer.apple.com/library/ios/documentation/uikit/reference/UIDevice_Class/Reference/UIDevice.html#//apple_ref/occ/instm/UIDevice/beginGeneratingDeviceOrientationNotifications

Have you called this first?

Answer 2

I'm using [[UIApplication sharedApplication] statusBarOrientation] based on this post: http://www.ddeville.me/2011/01/getting-the-interface-orientation-in-ios/

Is that what you tried that you said didn't work? I had trouble with [[UIDevice currentDevice] orientation] , but the status bar did the trick -- though not in applicationDidFinishLaunching . I'm using it in the rotation callback method, which gets called immediately afterwards anyway. (And the callback appears to get called twice back-to-back at application startup, the first time with the incorrect UIDeviceOrientationPortrait and the second time with the correct orientation.)