我向用户展示了一个视图控制器，其中的视图显示了一个 UIButton 来录制视频。当用户按下按钮时，我的应用程序崩溃并出现以下错误：
由于未捕获的异常“UIApplicationInvalidInterfaceOrientation”而终止应用程序，原因：“preferredInterfaceOrientationForPresentation 必须返回受支持的界面方向！”
我的应用程序仅支持纵向，并且 info.plist 文件反映正确。我在 Ray Wenderlich 的网站上找到的另一个应用程序中使用了相同的代码，并且效果很好。.h 和 .m 文件的代码如下。任何帮助，将不胜感激。
。H
#import <MediaPlayer/MediaPlayer.h>
#import <MobileCoreServices/UTCoreTypes.h>
#import <AssetsLibrary/AssetsLibrary.h>
@interface RecordSwingViewController: UIViewController
-(BOOL)startCameraControllerFromViewController:(UIViewController*)controller
usingDelegate:(id )delegate;
-(void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void*)contextInfo;
@property (weak, nonatomic) IBOutlet UIButton *record;
- (IBAction)recordSwing:(id)sender;
@end
.m
#import "RecordSwingViewController.h"
@interface RecordSwingViewController ()
@end
@implementation RecordSwingViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)recordSwing:(id)sender {
[self startCameraControllerFromViewController:self usingDelegate:self];
}
-(BOOL)shouldAutorotate
{
return NO;
}
-(BOOL)startCameraControllerFromViewController:(UIViewController*)controller
usingDelegate:(id )delegate {
// 1 - Validattions
if (([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera] == NO)
|| (delegate == nil)
|| (controller == nil)) {
return NO;
}
// 2 - Get image picker
UIImagePickerController *cameraUI = [[UIImagePickerController alloc] init];
cameraUI.sourceType = UIImagePickerControllerSourceTypeCamera;
// Displays a control that allows the user to choose movie capture
cameraUI.mediaTypes = [[NSArray alloc] initWithObjects:(NSString *)kUTTypeMovie, nil];
// Hides the controls for moving & scaling pictures, or for
// trimming movies. To instead show the controls, use YES.
cameraUI.allowsEditing = NO;
cameraUI.delegate = delegate;
// 3 - Display image picker
[controller presentViewController: cameraUI animated: YES completion:nil];
return YES;
}
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
NSString *mediaType = [info objectForKey: UIImagePickerControllerMediaType];
[self dismissViewControllerAnimated:NO completion:nil];
// Handle a movie capture
if (CFStringCompare ((__bridge_retained CFStringRef) mediaType, kUTTypeMovie, 0) == kCFCompareEqualTo) {
NSString *moviePath = [[info objectForKey:UIImagePickerControllerMediaURL] path];
if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(moviePath)) {
UISaveVideoAtPathToSavedPhotosAlbum(moviePath, self,
@selector(video:didFinishSavingWithError:contextInfo:), nil);
}
}
}
-(void)video:(NSString*)videoPath didFinishSavingWithError:(NSError*)error contextInfo:(void*)contextInfo {
if (error) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Video Saving Failed"
delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
} else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Video Saved" message:@"Saved To Photo Album"
delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
}
}
@end