Crash at self.view presentviewcontroller:UIImagePickerController in iOS 6

Question

When i try to call the photo Album from xcode 4.5 ,app crashes . Note : I set the app orientation to landscape mode.

UIImagePickerController *picker=nil;
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum])
{
    picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    picker.allowsEditing = NO;
    picker.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:
            UIImagePickerControllerSourceTypeSavedPhotosAlbum];

}

if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone ) {
    [self presentViewController:picker animated:YES completion:nil];
}

Answer 1

逻辑上的一个错误是，如果isSourceTypeAvailable在iPhone上返回NO，则您将尝试提供一个nil的控制器。