iOS调用相册和摄像头

以下是iOS调用相册和摄像头的代码，请参考。

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- (void)viewDidLoad {     [super viewDidLoad];     // Do any additional setup after loading the view.           UIImageView *imageView = [[UIImageView alloc] init];     imageView.frame = CGRectMake(0, 0, 80, 120);     imageView.backgroundColor = [UIColor greenColor];     imageView.tag = 101;           [self.view addSubview:imageView];           UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];     button.frame = CGRectMake(0, 200, 100, 30);     [button setTitle:@"打开相册" forState:UIControlStateNormal];     [button addTarget:self action:@selector(openPics) forControlEvents:UIControlEventTouchUpInside];     [self.view addSubview:button];           UIButton *button2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];     button2.frame = CGRectMake(0, 300, 100, 30);     [button2 setTitle:@"打开相机" forState:UIControlStateNormal];     [button2 addTarget:self action:@selector(openCamera) forControlEvents:UIControlEventTouchUpInside];     [self.view addSubview:button2]; }   // 打开相机 - (void)openCamera {     // UIImagePickerControllerCameraDeviceRear 后置摄像头     // UIImagePickerControllerCameraDeviceFront 前置摄像头     BOOL isCamera = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];     if (!isCamera) {         NSLog(@"没有摄像头");         return ;     }           UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];     imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;     imagePicker.delegate = self;     // 编辑模式     imagePicker.allowsEditing = YES;           [self  presentViewController:imagePicker animated:YES completion:^{     }];         }     // 打开相册 - (void)openPics {       UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];     imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;     imagePicker.delegate = self;     [self  presentViewController:imagePicker animated:YES completion:^{     }];             }     // 选中照片   - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{     NSLog(@"%@", info);     UIImageView  *imageView = (UIImageView *)[self.view viewWithTag:101];     // UIImagePickerControllerOriginalImage 原始图片     // UIImagePickerControllerEditedImage 编辑后图片     UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];     imageView.image = image;     [picker dismissViewControllerAnimated:YES completion:NULL];       }       // 取消相册 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {     [picker dismissViewControllerAnimated:YES completion:NULL];   }