UIImagePickerController返回错误的图像方向

6 回答

• 0

  我刚开始在自己的应用程序中处理这个问题 .

  我使用了Trevor Harmon制作的UIImage类别，用于调整图像大小并修正其方向，UIImage+Resize .

  然后你可以在 -imagePickerController:didFinishPickingMediaWithInfo: 做这样的事情

  UIImage *pickedImage = [info objectForKey:UIImagePickerControllerEditedImage];
  UIImage *resized = [pickedImage resizedImageWithContentMode:UIViewContentModeScaleAspectFit bounds:pickedImage.size interpolationQuality:kCGInterpolationHigh];
  

  这解决了我的问题 . 已调整大小的图像在视觉上正确定向，imageOrientation属性报告UIImageOrientationUp .

  这个缩放/调整大小/裁剪代码有几个版本;我使用了Trevor，因为它看起来很干净，还包括一些我想稍后使用的其他UIImage操纵器 .

  回复于 2024-05-02T21:17:55+08:00
• 8

  这是我找到的修复方向问题;适合我

  UIImage *initialImage = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
  NSData *data = UIImagePNGRepresentation(self.initialImage);
  
  UIImage *tempImage = [UIImage imageWithData:data];
  UIImage *fixedOrientationImage = [UIImage imageWithCGImage:tempImage.CGImage
                                       scale:initialImage.scale
                                 orientation:self.initialImage.imageOrientation];
  initialImage = fixedOrientationImage;
  

  回复于 2024-05-02T21:17:55+08:00
• 0

  这是一个可以有效解决问题的Swift片段：

  let orientedImage = UIImage(CGImage: initialImage.CGImage, scale: 1, orientation: initialImage.imageOrientation)!
  

  回复于 2024-05-02T21:17:55+08:00
• 6

  我使用以下代码放在一个单独的图像实用程序对象文件中，该文件包含许多用于UIImages的其他编辑方法：

  + (UIImage*)imageWithImage:(UIImage*)sourceImage scaledToSizeWithSameAspectRatio:(CGSize)targetSize
  {
      CGSize imageSize = sourceImage.size;
      CGFloat width = imageSize.width;
      CGFloat height = imageSize.height;
      CGFloat targetWidth = targetSize.width;
      CGFloat targetHeight = targetSize.height;
      CGFloat scaleFactor = 0.0;
      CGFloat scaledWidth = targetWidth;
      CGFloat scaledHeight = targetHeight;
      CGPoint thumbnailPoint = CGPointMake(0.0,0.0);
  
      if (CGSizeEqualToSize(imageSize, targetSize) == NO) {
          CGFloat widthFactor = targetWidth / width;
          CGFloat heightFactor = targetHeight / height;
  
          if (widthFactor > heightFactor) {
              scaleFactor = widthFactor; // scale to fit height
          }
          else {
              scaleFactor = heightFactor; // scale to fit width
          }
  
          scaledWidth  = width * scaleFactor;
          scaledHeight = height * scaleFactor;
  
          // center the image
          if (widthFactor > heightFactor) {
              thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;
          }
          else if (widthFactor < heightFactor) {
              thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;
          }
      }
  
      CGImageRef imageRef = [sourceImage CGImage];
      CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(imageRef);
      CGColorSpaceRef colorSpaceInfo = CGImageGetColorSpace(imageRef);
  
      if (bitmapInfo == kCGImageAlphaNone) {
          bitmapInfo = kCGImageAlphaNoneSkipLast;
      }
  
      CGContextRef bitmap;
  
      if (sourceImage.imageOrientation == UIImageOrientationUp || sourceImage.imageOrientation == UIImageOrientationDown) {
          bitmap = CGBitmapContextCreate(NULL, targetWidth, targetHeight, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, bitmapInfo);
  
      } else {
          bitmap = CGBitmapContextCreate(NULL, targetHeight, targetWidth, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, bitmapInfo);
  
      }
  
      // In the right or left cases, we need to switch scaledWidth and scaledHeight,
      // and also the thumbnail point
      if (sourceImage.imageOrientation == UIImageOrientationLeft) {
          thumbnailPoint = CGPointMake(thumbnailPoint.y, thumbnailPoint.x);
          CGFloat oldScaledWidth = scaledWidth;
          scaledWidth = scaledHeight;
          scaledHeight = oldScaledWidth;
  
          CGContextRotateCTM (bitmap, M_PI_2); // + 90 degrees
          CGContextTranslateCTM (bitmap, 0, -targetHeight);
  
      } else if (sourceImage.imageOrientation == UIImageOrientationRight) {
          thumbnailPoint = CGPointMake(thumbnailPoint.y, thumbnailPoint.x);
          CGFloat oldScaledWidth = scaledWidth;
          scaledWidth = scaledHeight;
          scaledHeight = oldScaledWidth;
  
          CGContextRotateCTM (bitmap, -M_PI_2); // - 90 degrees
          CGContextTranslateCTM (bitmap, -targetWidth, 0);
  
      } else if (sourceImage.imageOrientation == UIImageOrientationUp) {
          // NOTHING
      } else if (sourceImage.imageOrientation == UIImageOrientationDown) {
          CGContextTranslateCTM (bitmap, targetWidth, targetHeight);
          CGContextRotateCTM (bitmap, -M_PI); // - 180 degrees
      }
  
      CGContextDrawImage(bitmap, CGRectMake(thumbnailPoint.x, thumbnailPoint.y, scaledWidth, scaledHeight), imageRef);
      CGImageRef ref = CGBitmapContextCreateImage(bitmap);
      UIImage* newImage = [UIImage imageWithCGImage:ref];
  
      CGContextRelease(bitmap);
      CGImageRelease(ref);
  
      return newImage; 
  }
  

  然后我打电话

  UIImage *pickedImage = [info objectForKey:UIImagePickerControllerOriginalImage];
          UIImage *fixedOriginal = [ImageUtil imageWithImage:[mediaInfoDict objectForKey:UIImagePickerControllerOriginalImage] scaledToSizeWithSameAspectRatio:pickedImage.size];
  

  回复于 2024-05-02T21:17:55+08:00
• 0

  在iOS 7中，我需要依赖于UIImage.imageOrientation的代码来校正不同的方向 . 现在，在iOS 8.2中，当我通过UIImagePickerController从相册中选择旧的测试图像时，所有图像的方向都是UIImageOrientationUp . 当我拍照（UIImagePickerControllerSourceTypeCamera）时，无论设备方向如何，这些图像也将始终向上 . 因此，在这些iOS版本之间，显然已经有一个修复，如果需要，UIImagePickerController已经旋转了图像 . 您甚至可以注意到，当显示相册图像时：一瞬间，它们将以原始方向显示，然后才会以新的向上方向显示 .

  回复于 2024-05-02T21:17:55+08:00
• 14

  唯一对我有用的是重新渲染图像，这会强制正确的方向 .

  if (photo.imageOrientation != .up) {
     UIGraphicsBeginImageContextWithOptions(photo.size, false, 1.0);
     let rect = CGRect(x: 0, y: 0, width: photo.size.width, height: photo.size.height);
     photo.draw(in: rect)
     let newImage = UIGraphicsGetImageFromCurrentImageContext()
     UIGraphicsEndImageContext()
     photo = newImage;
  }
  

  回复于 2024-05-02T21:17:55+08:00