iphone 테이블의 일부 이미지가 자동으로 회전합니다.

Question

앨범 테이블의 사진이있는 데이터베이스가 있습니다. 모든 이미지를 배열로 가져와 테이블에 표시합니다. 90도 회전하는 이미지가 거의 없습니다.

여기에 cellForRow 메소드가 있습니다.

AlbumInformation * temp=[albumInfoArray objectAtIndex:indexPath.row]; 
cell.albumPicImageView.image=temp.albumPictureClass; 
return cell; 

이미지가 거의 나오지 않지만 이미지가 거의 회전하지 않습니다.

도와주세요.

미리 감사드립니다.

Answer 1

UIImage에는 "imageOrientation"이라는 assign 속성이 있습니다. 그래서이 방법이 도움이 될 수 있습니다 당신

• (있는 UIImage *) fixOrientation : (있는 UIImage *) aImage는 {

  // No-op if the orientation is already correct 
  if (aImage.imageOrientation == UIImageOrientationUp) 
      return aImage; 
  
  // We need to calculate the proper transformation to make the image upright. 
  // We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored. 
  CGAffineTransform transform = CGAffineTransformIdentity; 
  
  switch (aImage.imageOrientation) { 
      case UIImageOrientationDown: 
      case UIImageOrientationDownMirrored: 
       transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height); 
       transform = CGAffineTransformRotate(transform, M_PI); 
       break; 
  
      case UIImageOrientationLeft: 
      case UIImageOrientationLeftMirrored: 
       transform = CGAffineTransformTranslate(transform, aImage.size.width, 0); 
       transform = CGAffineTransformRotate(transform, M_PI_2); 
       break; 
  
      case UIImageOrientationRight: 
      case UIImageOrientationRightMirrored: 
       transform = CGAffineTransformTranslate(transform, 0, aImage.size.height); 
       transform = CGAffineTransformRotate(transform, -M_PI_2); 
       break; 
      default: 
       break; 
  } 
  
  switch (aImage.imageOrientation) { 
      case UIImageOrientationUpMirrored: 
      case UIImageOrientationDownMirrored: 
       transform = CGAffineTransformTranslate(transform, aImage.size.width, 0); 
       transform = CGAffineTransformScale(transform, -1, 1); 
       break; 
  
      case UIImageOrientationLeftMirrored: 
      case UIImageOrientationRightMirrored: 
       transform = CGAffineTransformTranslate(transform, aImage.size.height, 0); 
       transform = CGAffineTransformScale(transform, -1, 1); 
       break; 
      default: 
       break; 
  } 
  
  // Now we draw the underlying CGImage into a new context, applying the transform 
  // calculated above. 
  CGContextRef ctx = CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height, 
               CGImageGetBitsPerComponent(aImage.CGImage), 0, 
               CGImageGetColorSpace(aImage.CGImage), 
               CGImageGetBitmapInfo(aImage.CGImage)); 
  CGContextConcatCTM(ctx, transform); 
  switch (aImage.imageOrientation) { 
      case UIImageOrientationLeft: 
      case UIImageOrientationLeftMirrored: 
      case UIImageOrientationRight: 
      case UIImageOrientationRightMirrored: 
       // Grr... 
       CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.height,aImage.size.width), aImage.CGImage); 
       break; 
  
      default: 
       CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.width,aImage.size.height), aImage.CGImage); 
       break; 
  } 
  
  // And now we just create a new UIImage from the drawing context 
  CGImageRef cgimg = CGBitmapContextCreateImage(ctx); 
  UIImage *img = [UIImage imageWithCGImage:cgimg]; 
  CGContextRelease(ctx); 
  CGImageRelease(cgimg); 
  return img; 
  

  }

Answer 2

다음 샘플을 참조하십시오. PhotoDisplayViewController.m에서 다음 두 가지 경우를 테스트하면 자동으로 답변을 얻을 수 있습니다.

사례 1 : UIImageOrientation

ALAssetRepresentation *assetRepresentation = [asset defaultRepresentation]; 

    UIImage *fullScreenImage = [UIImage imageWithCGImage:[assetRepresentation fullScreenImage] scale:[assetRepresentation scale] orientation:(UIImageOrientation)[assetRepresentation orientation]]; 

사례 2 : 밖으로 UIImageOrientation

ALAssetRepresentation *assetRepresentation = [asset defaultRepresentation]; 

    UIImage *fullScreenImage = [UIImage imageWithCGImage:[assetRepresentation fullScreenImage] scale:[assetRepresentation scale] orientation:nil]; 

을 가진 당신에서 읽고

UIImageOrientationUp,   // default orientation 
    UIImageOrientationDown,   // 180 deg rotation 
    UIImageOrientationLeft,   // 90 deg CCW 
    UIImageOrientationRight,   // 90 deg CW 
    UIImageOrientationUpMirrored, // as above but image mirrored along other axis. horizontal flip 
    UIImageOrientationDownMirrored, // horizontal flip 
    UIImageOrientationLeftMirrored, // vertical flip 
    UIImageOrientationRightMirrored, // vertical flip 

을 다음과 같은 몇 가지 방향을 가지고 주장(210)

는 SO 다운로드이 샘플 데모를 통해 이동하시기 바랍니다

MyImagePicker Demo

참고 : 당신은 당신이

NSUInteger groupTypes = ALAssetsGroupAlbum | ALAssetsGroupEvent | ALAssetsGroupFaces|ALAssetsGroupLibrary|ALAssetsGroupSavedPhotos|ALAssetsGroupPhotoStream; 

을 다음과 같은 RootViewController.m 코드를 변경해야하는 모든 앨범에서 표시하려는 경우