尝试将图像调整为缩略图，为kCGInterpolationHigh收到错误“使用未解析的标识符”

Question

尝试使用以下代码将图像调整为缩略图，收到错误：

  

使用未解析的标识符

代表kCGInterpolationHigh

@IBAction func dropPhoto(sender: AnyObject) {
    presentViewController(imagePicker, animated: true, completion: nil)
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
    self.dismissViewControllerAnimated(true, completion: nil)

    let thumbnail = image.resizedImageWithContentMode(UIViewContentMode.ScaleAspectFit, bounds: CGSizeMake(400, 400), interpolationQuality: kCGInterpolationHigh)
    let imgData = UIImagePNGRepresentation(thumbnail)

}
}

Answer 1

在iOS 9 +中使用CGInterpolationQuality.High代替kCGInterpolationHigh。

参考：https://developer.apple.com/library/prerelease/ios/documentation/GraphicsImaging/Reference/CGContext/index.html#//apple_ref/c/tdef/CGInterpolationQuality