在纵向或横向拍摄照片并根据拍摄方向设置为方向约束的视图？

1 回答

• 1

  试试这段代码：

  它会自动改变方向

  - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
  
  
      UIImage *choosedImage = [info objectForKey:UIImagePickerControllerOriginalImage];
      [picker dismissViewControllerAnimated:YES completion:NULL];
      Yourimageview.image=[self scaleAndRotateImage:choosedImage];
  
  
  }
  
  - (UIImage *)scaleAndRotateImage:(UIImage *)image {
      int kMaxResolution = 640; // Or whatever
  
      CGImageRef imgRef = image.CGImage;
  
      CGFloat width = CGImageGetWidth(imgRef);
      CGFloat height = CGImageGetHeight(imgRef);
  
  
      CGAffineTransform transform = CGAffineTransformIdentity;
      CGRect bounds = CGRectMake(0, 0, width, height);
      if (width > kMaxResolution || height > kMaxResolution) {
          CGFloat ratio = width/height;
          if (ratio > 1) {
              bounds.size.width = kMaxResolution;
              bounds.size.height = roundf(bounds.size.width / ratio);
          }
          else {
              bounds.size.height = kMaxResolution;
              bounds.size.width = roundf(bounds.size.height * ratio);
          }
      }
  
      CGFloat scaleRatio = bounds.size.width / width;
      CGSize imageSize = CGSizeMake(CGImageGetWidth(imgRef), CGImageGetHeight(imgRef));
      CGFloat boundHeight;
      UIImageOrientation orient = image.imageOrientation;
      switch(orient) {
  
          case UIImageOrientationUp: //EXIF = 1
              transform = CGAffineTransformIdentity;
              break;
  
          case UIImageOrientationUpMirrored: //EXIF = 2
              transform = CGAffineTransformMakeTranslation(imageSize.width, 0.0);
              transform = CGAffineTransformScale(transform, -1.0, 1.0);
              break;
  
          case UIImageOrientationDown: //EXIF = 3
              transform = CGAffineTransformMakeTranslation(imageSize.width, imageSize.height);
              transform = CGAffineTransformRotate(transform, M_PI);
              break;
  
          case UIImageOrientationDownMirrored: //EXIF = 4
              transform = CGAffineTransformMakeTranslation(0.0, imageSize.height);
              transform = CGAffineTransformScale(transform, 1.0, -1.0);
              break;
  
          case UIImageOrientationLeftMirrored: //EXIF = 5
              boundHeight = bounds.size.height;
              bounds.size.height = bounds.size.width;
              bounds.size.width = boundHeight;
              transform = CGAffineTransformMakeTranslation(imageSize.height, imageSize.width);
              transform = CGAffineTransformScale(transform, -1.0, 1.0);
              transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
              break;
  
          case UIImageOrientationLeft: //EXIF = 6
              boundHeight = bounds.size.height;
              bounds.size.height = bounds.size.width;
              bounds.size.width = boundHeight;
              transform = CGAffineTransformMakeTranslation(0.0, imageSize.width);
              transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
              break;
  
          case UIImageOrientationRightMirrored: //EXIF = 7
              boundHeight = bounds.size.height;
              bounds.size.height = bounds.size.width;
              bounds.size.width = boundHeight;
              transform = CGAffineTransformMakeScale(-1.0, 1.0);
              transform = CGAffineTransformRotate(transform, M_PI / 2.0);
              break;
  
          case UIImageOrientationRight: //EXIF = 8
              boundHeight = bounds.size.height;
              bounds.size.height = bounds.size.width;
              bounds.size.width = boundHeight;
              transform = CGAffineTransformMakeTranslation(imageSize.height, 0.0);
              transform = CGAffineTransformRotate(transform, M_PI / 2.0);
              break;
  
          default:
              [NSException raise:NSInternalInconsistencyException format:@"Invalid image orientation"];
  
      }
  
      UIGraphicsBeginImageContext(bounds.size);
  
      CGContextRef context = UIGraphicsGetCurrentContext();
  
      if (orient == UIImageOrientationRight || orient == UIImageOrientationLeft) {
          CGContextScaleCTM(context, -scaleRatio, scaleRatio);
          CGContextTranslateCTM(context, -height, 0);
      }
      else {
          CGContextScaleCTM(context, scaleRatio, -scaleRatio);
          CGContextTranslateCTM(context, 0, -height);
      }
  
      CGContextConcatCTM(context, transform);
  
      CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, width, height), imgRef);
      UIImage *imageCopy = UIGraphicsGetImageFromCurrentImageContext();
      UIGraphicsEndImageContext();
  
      return imageCopy;
  }
  

  希望它能帮助你

  回复于 2024-04-29T08:02:42+08:00