UIImagePickerController图像方向

3 回答

• 14

  不，UIImagePickerController无法明确地执行此操作 .

  如果要根据图像的内容确定 . 这是一个很难的问题 . 如何在不了解图像内容的情况下确定图像的方向？

  我可以建议你一个技巧，你检查返回图像的宽度和长度，看看它是纵向还是横向 . 为了旋转图像，外面有一些库和代码，但我没有尝试过 . 你可以看看this blog

  回复于 2024-05-03T00:12:34+08:00
• 2

  Vodkhang的答案部分不正确 - 现代相机拍摄照片时会在图像中显示明确的方向 . 这已经普遍存在了大约5年 .

  我之前使用过这个答案中的代码通过直接从图片中读取“方向”信息来进行旋转：

  UIImagePickerController camera preview is portrait in landscape app

  回复于 2024-05-03T00:12:34+08:00
• -4

  // Use this UIImagePickerController's  delegate method
      - (void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary*)info {
          // Getting image user just has shoot
          UIImage* image = [info objectForKey:UIImagePickerControllerOriginalImage];
  
          // Fixing to stick with only one orientation (UIImageOrientationUp in this case)
          switch (image.imageOrientation) {
              case UIImageOrientationDown:
              case UIImageOrientationDownMirrored:
              case UIImageOrientationLeft:
              case UIImageOrientationLeftMirrored:
              case UIImageOrientationRight:
              case UIImageOrientationRightMirrored:
                  image = [UIImage imageWithCGImage:image.CGImage
                                                    scale:image.scale
                                              orientation:UIImageOrientationUp]; // change this if you need another orientation
                  break;
              case UIImageOrientationUp:
              case UIImageOrientationUpMirrored:
                  // The image is already in correct orientation
                  break;
          }
  
          // Do whatever you want with image (likely pass it to some UIImageView to display)
          UIImageView *imgView = [[UIImageView alloc] initWithImage:image];
  
          // Dismiss UIImagePickerController
          [picker dismissModalViewControllerAnimated:NO];
      }
  

  注意： UIImageView 读取 imageOrientation 属性并相应地显示 UIImage .

  回复于 2024-05-03T00:12:34+08:00