Swift PNG图像以不正确的方向保存

如果在保存之前使用图像，则是正常的。 但是，如果我保存并在以后使用它是90度转向。 我怎样才能确保它不会横向保存？

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!) } }) } 

Answer 1

如果你需要保存你的PNG正确的旋转，你将需要重新绘制图像，如果其方向不是.up 。 您可以重新绘制如下：

 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() } }