Xcode仅在横向拍摄照片/视频

Question

How do I ensure that when user activates his camera, if the device (iPhone/iPod/iPad) is being hold as portrait, I want to inform user to rotate the device to landscape and take photo/record video in landscape?

However, app (all my UIViewControllers, UITableViewControllers, etc) are in portrait mode only, no landscape.

Answer 1

Check the interface orientation:

if (UIInterfaceOrientationIsPortrait([UIDevice currentDevice].orientation))
{
  // call methods to take picture
  ....
}
else
{
  // alert the user this device is not landscape mode
  ...
}

Answer 2

In iOS 6 autorotation has slightly changed, however, the same approach is still working.

Sample code:

@implementation UIImagePickerController (noRotation)

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation /* iOS 5 */
{
    return UIInterfaceOrientationIsLandscape(toInterfaceOrientation);
}

- (NSUInteger)supportedInterfaceOrientations /* iOS 6 */
{
    return UIInterfaceOrientationMaskLandscape;
}

@end