Swift PNG图像以不正确的方向保存 [英] Swift PNG Image being saved with incorrect orientation

问题描述

如果我在保存图像之前使用它是正常的。但如果我保存它并在以后使用它是90度转动。如何确保它不会横向保存？

If I use the image before it is saved it is normal. But if I save it and use it later is is 90 degrees turned. How can I make sure it doesn't save sideways?

func saveEvent(_ center1: CLLocation, title2: String, imagePicked1: UIImage)
    {
        let data = UIImagePNGRepresentation(imagePicked1);///
        let url = NSURL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(NSUUID().uuidString+".dat")
        do {
            try data!.write(to: url!, options: [])
        } catch let e as NSError {
            print("Error! \(e)");
            return
        }
        let image11 = CKAsset(fileURL: url!)

        self.eventRecord.setObject(image11 as CKAsset, forKey: "Picture")
        let publicData = CKContainer.default().publicCloudDatabase
            publicData.save(self.eventRecord, completionHandler: { record, error in
                if error == nil
                {
                    print("Image saved")
                }else{
                    print(error!)
                }
        })
    }

推荐答案

如果你需要保存正确的旋转PNG，你需要重新绘制图像，如果它的方向不是 .UP 。你可以重新绘制如下：

If you need to save your PNG with correct rotation you will need to redraw your image if its orientation it is not .up. You can redraw it as follow:

extension UIImage {
    var png: Data? {
        guard let flattened = flattened else { return nil }
        return UIImagePNGRepresentation(flattened)
    }
    var flattened: UIImage? {
        if imageOrientation == .up { return self }
        UIGraphicsBeginImageContextWithOptions(size, false, scale)
        defer { UIGraphicsEndImageContext() }
        draw(in: CGRect(origin: .zero, size: size))
        return UIGraphicsGetImageFromCurrentImageContext()
    }
}

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