ios - 将 JPEG 图像压缩并复制到文件夹会丢失其旋转 - iOS Swift

Question

我目前在我的应用程序文件夹中保存了一张 JPEG 图像，其方向正确。我需要将该图像压缩并复制到一个临时文件夹，然后将 URL 发送到 S3，我这样做是有效的，但图像失去了旋转属性。

这是我的:

//I retrieve the image
PHImageManager.defaultManager().requestImageForAsset(p, targetSize: PHImageManagerMaximumSize, contentMode: .AspectFill, options: nil, resultHandler: {(result, info)in
                //Create temp url
                let testFileURL = NSURL(fileURLWithPath: NSTemporaryDirectory().stringByAppendingPathComponent("temp"))

                //Compress the image, I think is here where the orientation is lost
                let data = UIImageJPEGRepresentation(result, 0)

                //Write the image to the tmp folder, or maybe it is here where is lost
                data.writeToURL(testFileURL!, atomically: true)

                //Send URL to upload to S3
                self.uploadImagesToS3(testFileURL!, picName: p.valueForKey("filename") as String, deviceID: deviceID, length: data.length)
            })

有人知道我能做什么吗？。图像在压缩和复制之前具有正确的方向，但在之后旋转。图片取自相机。

谢谢!

Answer 1

这最终对我有用:

我改变了这一行:

let data = UIImageJPEGRepresentation(result, 0)

对于这个:

let data = UIImageJPEGRepresentation(self.correctlyOrientedImage(result), 0)

并添加了函数:

func correctlyOrientedImage(image: UIImage) -> UIImage {
    if image.imageOrientation == UIImageOrientation.Up {
        return image
    }

    UIGraphicsBeginImageContextWithOptions(image.size, false, image.scale)
    image.drawInRect(CGRectMake(0, 0, image.size.width, image.size.height))
    var normalizedImage:UIImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return normalizedImage;
}

您可以在这里找到 https://stackoverflow.com/a/27775741/2364453