Ios swift相机图像选择器旋转问题

Question

  func imagePickerController(_ picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {}

从上面的代码中检索到的图像会将图像旋转 90 度有什么解决方案吗？

Answer 1

我有同样的问题。请检查这个 UIImage 扩展：

import UIKit

extension UIImage {

    func fixedOrientation() -> UIImage {
        // No-op if the orientation is already correct
        if (imageOrientation == UIImageOrientation.up) {
            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.
        var transform:CGAffineTransform = CGAffineTransform.identity

        if (imageOrientation == UIImageOrientation.down
            || imageOrientation == UIImageOrientation.downMirrored) {

            transform = transform.translatedBy(x: size.width, y: size.height)
            transform = transform.rotated(by: CGFloat(M_PI))
        }

        if (imageOrientation == UIImageOrientation.left
            || imageOrientation == UIImageOrientation.leftMirrored) {

            transform = transform.translatedBy(x: size.width, y: 0)
            transform = transform.rotated(by: CGFloat(M_PI_2))
        }

        if (imageOrientation == UIImageOrientation.right
            || imageOrientation == UIImageOrientation.rightMirrored) {

            transform = transform.translatedBy(x: 0, y: size.height);
            transform = transform.rotated(by: CGFloat(-M_PI_2));
        }

        if (imageOrientation == UIImageOrientation.upMirrored
            || imageOrientation == UIImageOrientation.downMirrored) {

            transform = transform.translatedBy(x: size.width, y: 0)
            transform = transform.scaledBy(x: -1, y: 1)
        }

        if (imageOrientation == UIImageOrientation.leftMirrored
            || imageOrientation == UIImageOrientation.rightMirrored) {

            transform = transform.translatedBy(x: size.height, y: 0);
            transform = transform.scaledBy(x: -1, y: 1);
        }


        // Now we draw the underlying CGImage into a new context, applying the transform
        // calculated above.
        let ctx:CGContext = CGContext(data: nil, width: Int(size.width), height: Int(size.height),
                                      bitsPerComponent: cgImage!.bitsPerComponent, bytesPerRow: 0,
                                      space: cgImage!.colorSpace!,
                                      bitmapInfo: cgImage!.bitmapInfo.rawValue)!

        ctx.concatenate(transform)


        if (imageOrientation == UIImageOrientation.left
            || imageOrientation == UIImageOrientation.leftMirrored
            || imageOrientation == UIImageOrientation.right
            || imageOrientation == UIImageOrientation.rightMirrored
            ) {


            ctx.draw(cgImage!, in: CGRect(x:0,y:0,width:size.height,height:size.width))

        } else {
            ctx.draw(cgImage!, in: CGRect(x:0,y:0,width:size.width,height:size.height))
        }


        // And now we just create a new UIImage from the drawing context
        let cgimg:CGImage = ctx.makeImage()!
        let imgEnd:UIImage = UIImage(cgImage: cgimg)

        return imgEnd
    }
}

请让我知道这对你有没有用。:)