Supported orientations has no common orientation with the application crash bug on iPad

Supported
orientations has no common orientation with the application, and shouldAutorotate is returning YES'

在iOS 6中，iPad landscape模式下，popoverController的contentViewController设置为UIImagePickerController, popover弹出时会遇到上述crash问题。
一个可行的解决方法是：

添加如下Category：

@interface UIImagePickerController(Nonrotating)
- (BOOL)shouldAutorotate;
@end

@implementation UIImagePickerController(Nonrotating)

- (BOOL)shouldAutorotate {
return NO;
}

参考：http://stackoverflow.com/questions/12540597/supported-orientations-has-no-common-orientation-with-the-application-and-shoul?lq=1