私も同じ問題に直面していました。この関数を使用して解決する:
func fixImageOrientation(src:UIImage)->UIImage {
if src.imageOrientation == UIImageOrientation.Up {
return src
}
var transform: CGAffineTransform = CGAffineTransformIdentity
switch src.imageOrientation {
case UIImageOrientation.Down, UIImageOrientation.DownMirrored:
transform = CGAffineTransformTranslate(transform, src.size.width, src.size.height)
transform = CGAffineTransformRotate(transform, CGFloat(M_PI))
break
case UIImageOrientation.Left, UIImageOrientation.LeftMirrored:
transform = CGAffineTransformTranslate(transform, src.size.width, 0)
transform = CGAffineTransformRotate(transform, CGFloat(M_PI_2))
break
case UIImageOrientation.Right, UIImageOrientation.RightMirrored:
transform = CGAffineTransformTranslate(transform, 0, src.size.height)
transform = CGAffineTransformRotate(transform, CGFloat(-M_PI_2))
break
case UIImageOrientation.Up, UIImageOrientation.UpMirrored:
break
}
switch src.imageOrientation {
case UIImageOrientation.UpMirrored, UIImageOrientation.DownMirrored:
CGAffineTransformTranslate(transform, src.size.width, 0)
CGAffineTransformScale(transform, -1, 1)
break
case UIImageOrientation.LeftMirrored, UIImageOrientation.RightMirrored:
CGAffineTransformTranslate(transform, src.size.height, 0)
CGAffineTransformScale(transform, -1, 1)
case UIImageOrientation.Up, UIImageOrientation.Down, UIImageOrientation.Left, UIImageOrientation.Right:
break
}
let ctx:CGContextRef = CGBitmapContextCreate(nil, Int(src.size.width), Int(src.size.height), CGImageGetBitsPerComponent(src.CGImage), 0, CGImageGetColorSpace(src.CGImage), CGImageAlphaInfo.PremultipliedLast.rawValue)!
CGContextConcatCTM(ctx, transform)
switch src.imageOrientation {
case UIImageOrientation.Left, UIImageOrientation.LeftMirrored, UIImageOrientation.Right, UIImageOrientation.RightMirrored:
CGContextDrawImage(ctx, CGRectMake(0, 0, src.size.height, src.size.width), src.CGImage)
break
default:
CGContextDrawImage(ctx, CGRectMake(0, 0, src.size.width, src.size.height), src.CGImage)
break
}
let cgimg:CGImageRef = CGBitmapContextCreateImage(ctx)!
let img:UIImage = UIImage(CGImage: cgimg)
return img
}
私は画像がすでに正しく回転していると言っているので、これは適切なソリューションではないと私は思わない。メタデータ(imageOrientation)のみが間違っている。 – ade
@EricDの回答が "Swift"で更新されました。ありがとう:) – ivarun