iOS拍照之系统拍照

拍照在App中使用频次高，入门级别直接调用系统拍照

---

• 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