我找到了另一个非常好的解决方案，可以解决这个问题。在使用UIImagePickerController捕获图像后，您只需要将图像作为参数传递给此方法即可。它适用于所有版本的iOS以及相机的横向和纵向方向。 使用UIImageOrientaiton检查图像的EXIF属性，并根据方向的值转换和缩放图像，因此您将获得与相机视图方向相同的具有相同方向的返回图像。
在此我保持最大分辨率为3000，以便在使用视网膜设备时不会破坏图像质量，但您可以根据需要更改其分辨率。
//Objective C代码:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info;
{
UIImage *imagePicked = [info valueForKey:UIImagePickerControllerOriginalImage];
imagePicked = [self scaleAndRotateImage:imagePicked];
[[self delegate] sendImage:imagePicked];
[self.imagePicker dismissViewControllerAnimated:YES completion:nil];
}
- (UIImage *) scaleAndRotateImage: (UIImage *)image
{
int kMaxResolution = 3000;
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 = bounds.size.width / ratio;
}
else {
bounds.size.height = kMaxResolution;
bounds.size.width = 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:
transform = CGAffineTransformIdentity;
break;
case UIImageOrientationUpMirrored:
transform = CGAffineTransformMakeTranslation(imageSize.width, 0.0);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
break;
case UIImageOrientationDown:
transform = CGAffineTransformMakeTranslation(imageSize.width, imageSize.height);
transform = CGAffineTransformRotate(transform, M_PI);
break;
case UIImageOrientationDownMirrored:
transform = CGAffineTransformMakeTranslation(0.0, imageSize.height);
transform = CGAffineTransformScale(transform, 1.0, -1.0);
break;
case UIImageOrientationLeftMirrored:
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:
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:
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:
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;
}
// Swift 4.0 代码：
func scaleAndRotateImage(image: UIImage, MaxResolution iIntMaxResolution: Int) -> UIImage {
let kMaxResolution = iIntMaxResolution
let imgRef = image.cgImage!
let width: CGFloat = CGFloat(imgRef.width)
let height: CGFloat = CGFloat(imgRef.height)
var transform = CGAffineTransform.identity
var bounds = CGRect.init(x: 0, y: 0, width: width, height: height)
if Int(width) > kMaxResolution || Int(height) > kMaxResolution {
let ratio: CGFloat = width / height
if ratio > 1 {
bounds.size.width = CGFloat(kMaxResolution)
bounds.size.height = bounds.size.width / ratio
}
else {
bounds.size.height = CGFloat(kMaxResolution)
bounds.size.width = bounds.size.height * ratio
}
}
let scaleRatio: CGFloat = bounds.size.width / width
let imageSize = CGSize.init(width: CGFloat(imgRef.width), height: CGFloat(imgRef.height))
var boundHeight: CGFloat
let orient = image.imageOrientation
switch orient {
case .up:
transform = CGAffineTransform.identity
case .upMirrored:
transform = CGAffineTransform.init(translationX: imageSize.width, y: 0.0)
transform = transform.scaledBy(x: -1.0, y: 1.0)
case .down:
transform = CGAffineTransform.init(translationX: imageSize.width, y: imageSize.height)
transform = transform.rotated(by: CGFloat(Double.pi / 2))
case .downMirrored:
transform = CGAffineTransform.init(translationX: 0.0, y: imageSize.height)
transform = transform.scaledBy(x: 1.0, y: -1.0)
case .leftMirrored:
boundHeight = bounds.size.height
bounds.size.height = bounds.size.width
bounds.size.width = boundHeight
transform = CGAffineTransform.init(translationX: imageSize.height, y: imageSize.width)
transform = transform.scaledBy(x: -1.0, y: 1.0)
transform = transform.rotated(by: CGFloat(Double.pi / 2) / 2.0)
break
default: print("Error in processing image")
}
UIGraphicsBeginImageContext(bounds.size)
let context = UIGraphicsGetCurrentContext()
if orient == .right || orient == .left {
context?.scaleBy(x: -scaleRatio, y: scaleRatio)
context?.translateBy(x: -height, y: 0)
}
else {
context?.scaleBy(x: scaleRatio, y: -scaleRatio)
context?.translateBy(x: 0, y: -height)
}
context?.concatenate(transform)
context?.draw(imgRef, in: CGRect.init(x: 0, y: 0, width: width, height: height))
let imageCopy = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return imageCopy!
}
视图处于横屏模式，但相机旋转了 90 度