无法使用UISlider降低CIVignette效果 [英] Unable to Decrease CIVignette effect using UISlider

问题描述

我在我的照片编辑应用中使用了 CIVignette 效果。它基于Slider的Changeing事件应用。我使用了以下代码，但我的问题是每当出现增加滑块值的Vignette效果时出现，但每当我降低滑块值的Vignette效果都不会减少。

请帮助。 b $ b

  @IBAction函数滑块（_发送者：UISlider）{
 
让startImage = CIImage（image：imgEdited！）！ 
 
让vignetteFilter = CIFilter（name： CIVignette）！ 
 
让半径= 5 
 
 vignetteFilter.setValue（startImage，forKey：kCIInputImageKey）
 vignetteFilter.setValue（sender.value，forKey： inputIntensity）
 vignetteFilter.setValue（radius，forKey： inputRadius）
 
让filteredImageData = vignetteFilter.value（forKey：kCIOutputImageKey）为！ CIImage 
让filteredImageRef = self.context.createCGImage（filteredImageData，来自：filteredImageData.extent）
 
 imgImage.image = UIImage.init（cgImage：filteredImageRef！）
 self.imgEdited = imgImage.image 
} 
  

解决方案

下面的代码根据我对其他 SO 帖子的回答

I have used CIVignette effect for My Photo Editing app. It applying based on Slider's Changing event. I have used following code and my issue is whenever I increased slider's value Vignette effect is appeared but whenever I decrease slider's value the Vignette effect does not decrease.
Please Help.

@IBAction func slider(_ sender: UISlider) {

        let startImage = CIImage(image: imgEdited!)!

        let vignetteFilter = CIFilter(name: "CIVignette")!

        let radius = 5

        vignetteFilter.setValue(startImage, forKey:kCIInputImageKey)
        vignetteFilter.setValue(sender.value, forKey:"inputIntensity")
        vignetteFilter.setValue(radius, forKey:"inputRadius")

        let filteredImageData = vignetteFilter.value(forKey: kCIOutputImageKey) as! CIImage
        let filteredImageRef = self.context.createCGImage(filteredImageData, from: filteredImageData.extent)

        imgImage.image = UIImage.init(cgImage: filteredImageRef!)
        self.imgEdited = imgImage.image
}

解决方案

Below code based on my answer to the other SO post Blur effect using slider Is not working properly.

 @IBAction func slider(_ sender: UISlider) {

    let startImage = CIImage(image: UIImage(named: "Your Image Name")!) // You should initialise your UIImage here not UIImageView
    let vignetteFilter = CIFilter(name: "CIVignette")! 

    vignetteFilter.setValue(startImage, forKey:kCIInputImageKey)
    vignetteFilter.setValue(sender.value, forKey:kCIInputIntensityKey)
    vignetteFilter.setValue(5, forKey:kCIInputRadiusKey)

    let filteredImageData = vignetteFilter.value(forKey: kCIOutputImageKey) as! CIImage
    let filteredImageRef = self.context.createCGImage(filteredImageData, from: filteredImageData.extent)

    self.imgView.image = UIImage.init(cgImage: filteredImageRef!) // Output

 }

Output from the Sim:

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