UIImagePickerController圖像方向

Question

誰能告訴我如何使用UIImagePickerController（相機和專輯）代表確定圖像的方向，相應地旋轉，並將其分配給UIImageView？

Answer 1

不，UIImagePickerController不能明確地做到這一點。

如果你想根據圖像的內容來確定。這是一個難題。如何在不理解圖片內容的情況下確定圖片的方向？

我可以建議你一個技巧，你檢查返回的圖像的寬度和長度，看看它是縱向還是橫向。爲了旋轉圖像，外面有一些庫和代碼，但我沒有嘗試太多。你可以看看this blog

Answer 2

Vodkhang的答案部分不正確 - 現代相機在拍照時會對圖像進行明確的定位。這在現在已經有5年多了。

我以前使用的代碼在這個答案做旋轉通過閱讀「方向」信息從圖片直接：

UIImagePickerController camera preview is portrait in landscape app

Answer 3

// 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：UIImageView讀取imageOrientation財產和相應地顯示UIImage。