iOS拍照之系统拍照

Posted 2021-10-05 善斋书屋

拍照在App中使用频次高，入门级别直接调用系统拍照

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• 思路：

  系统拍照使用UIImagePickerController

  1.设置下plist，否则没权限，报错

  2.判断摄像头，获取权限，否则弹出界面黑着

  3.设置代理，实现代理

  4.代理方法中获取拍照的图片/视频

• 上菜

  • plist中添加Privacy - Camera Usage Description，文案根据App需要来
  • 权限

  if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { 
  
  }

  • 设置UIImagePickerController

  UIImagePickerController *vc = [[UIImagePickerController alloc] init];
  // 设置该属性的时候，出现拍照与拍视频选项
  vc.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];
  vc.sourceType = UIImagePickerControllerSourceTypeCamera;
  vc.delegate = self;
  vc.allowsEditing = NO;
  // 设置摄像头[后置摄像头]
  vc.cameraDevice = UIImagePickerControllerCameraDeviceRear;
  // 设置闪光模式
  vc.cameraFlashMode = UIImagePickerControllerCameraFlashModeAuto;
  // 设置摄像头模式
  vc.cameraCaptureMode = UIImagePickerControllerCameraCaptureModeVideo; // 当该模式设置为video的时候，meidaTypes设置出现拍照与拍视频选项时，先展示video视频拍摄选项
  // 录制的最大时间
  vc.videoMaximumDuration = 10;
  // 视频质量
  vc.videoQuality = UIImagePickerControllerQualityTypeHigh;
  vc.modalPresentationStyle = UIModalPresentationFullScreen;
  [[[[UIApplication sharedApplication] keyWindow] rootViewController] presentViewController:vc
                                                                                   animated:YES
                                                                                 completion:nil];

  • 代理实现

  #pragma mark - UINavigationControllerDelegate, UIImagePickerControllerDelegate
  - (void)imagePickerController:(UIImagePickerController *)picker
  didFinishPickingMediaWithInfo:(NSDictionary<UIImagePickerControllerInfoKey,id> *)info {
      // 获取选中资源类型
      NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
      if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) { // 拍照结果
          UIImage *image = nil;
          if (picker.allowsEditing) {
              image = [info objectForKey:UIImagePickerControllerEditedImage];
          } else {
              image = [info objectForKey:UIImagePickerControllerOriginalImage];
          }
          [picker dismissViewControllerAnimated:YES completion:nil];
      } else if ([mediaType isEqualToString:(NSString *)kUTTypeMovie]) { // 视频结果
          NSURL *url = [info objectForKey:UIImagePickerControllerMediaURL];
          // 视频存放到系统相册
          [phphotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
              if (status == PHAuthorizationStatusAuthorized) {
                  [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
                             [PHAssetChangeRequest creationRequestForAssetFromVideoAtFileURL:url];
                         } completionHandler:^(BOOL success, NSError * error) {
                             if (success) {
                                 NSLog(@"保存视频到相册");
                             } else {
                                 NSLog(@"保存视频到相册失败：%@", error);
                             }
                         }];
              } else {
                  NSLog(@"无访问相册权限");
              }
              dispatch_async(dispatch_get_main_queue(), ^{
                  [picker dismissViewControllerAnimated:YES completion:nil];
              });
          }];
      }
  }
  
  - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
      [picker dismissViewControllerAnimated:YES completion:nil];
  }

• 结语：

  UIImagePickerController使用方便，可拍照、视频。适用于拍照界面无定制、简单取图这类需求