UIImagePickerController摄像头设备问题

Question

我有以下问题：当我使用UIImagePickerController，AFTER我捕捉图片，快门出现并消失，有一个屏幕，捕获的图片和两个按钮：“重拍”和“使用”。即使我在landscapeLeft或landscapeRight中拍摄照片，在上述屏幕上拍摄的照片都会以纵向显示，无论如何。

现在，我的问题如下：我如何使所选图像以其原始方向显示？

感谢

Answer 1

当你拿起一张照片，并呼吁的UIImagePickerController方法imagePickerController: didFinishPickingImage: editingInfo:它的代表比你可以检查的UIImage其返回。它应该有方向属性。如果它不是零比标准化它。我在一个类别中添加了imageWithFixedOrientation方法到UIImage。看到它的代码如下：

- (UIImage *)imageWithFixedOrientation { 
    // No-op if the orientation is already correct 
    if (self.imageOrientation == UIImageOrientationUp) return self; 
    // 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 (self.imageOrientation) { 
     case UIImageOrientationDown: 
     case UIImageOrientationDownMirrored: 
      transform = CGAffineTransformTranslate(transform, self.size.width, self.size.height); 
      transform = CGAffineTransformRotate(transform, M_PI); 
      break; 

     case UIImageOrientationLeft: 
     case UIImageOrientationLeftMirrored: 
      transform = CGAffineTransformTranslate(transform, self.size.width, 0); 
      transform = CGAffineTransformRotate(transform, M_PI_2); 
      break; 

     case UIImageOrientationRight: 
     case UIImageOrientationRightMirrored: 
      transform = CGAffineTransformTranslate(transform, 0, self.size.height); 
      transform = CGAffineTransformRotate(transform, -M_PI_2); 
      break; 
     default: 
      break; 
    } 

    switch (self.imageOrientation) { 
     case UIImageOrientationUpMirrored: 
     case UIImageOrientationDownMirrored: 
      transform = CGAffineTransformTranslate(transform, self.size.width, 0); 
      transform = CGAffineTransformScale(transform, -1, 1); 
      break; 

     case UIImageOrientationLeftMirrored: 
     case UIImageOrientationRightMirrored: 
      transform = CGAffineTransformTranslate(transform, self.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, self.size.width, self.size.height, 
              CGImageGetBitsPerComponent(self.CGImage), 0, 
              CGImageGetColorSpace(self.CGImage), 
              CGImageGetBitmapInfo(self.CGImage)); 
    CGContextConcatCTM(ctx, transform); 
    switch (self.imageOrientation) { 
     case UIImageOrientationLeft: 
     case UIImageOrientationLeftMirrored: 
     case UIImageOrientationRight: 
     case UIImageOrientationRightMirrored: 
      // Grr... 
      CGContextDrawImage(ctx, CGRectMake(0,0,self.size.height,self.size.width), self.CGImage); 
      break; 

     default: 
      CGContextDrawImage(ctx, CGRectMake(0,0,self.size.width,self.size.height), self.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; 
}