CIFilter 应用于图像不起作用 - swift

Question

我正在尝试将 CIFilter 应用于单视图应用程序中已显示在我的 imageView 中的图像，但它似乎没有应用过滤器。 请问有人可以建议吗？ 我的输入图像看起来完全相同。

.SWIFT：

let filter = CIFilter.init(name: "CIHueAdjust")
let context = CIContext()
var extent: CGRect!
var scaleFactor: CGFloat!
@IBOutlet weak var img: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
let ciImage = CIImage.init(image: img.image!)
filter?.setDefaults()
filter?.setValue(ciImage, forKeyPath: kCIInputImageKey)
let result = filter?.outputImage
print("result: (result)")
var image = UIImage.init(cgImage: context.createCGImage(result!, from: result!.extent)!)
img.image = image

img.image = image
}

安慰：

result: Optional(<CIImage: 0x1c001a7a0 extent [0 0 2016 1512]>
affine [1 0 0 -1 0 1512] extent=[0 0 2016 1512] opaque
colormatch "sRGB IEC61966-2.1"_to_workingspace extent=[0 0 2016 1512] opaque
IOSurface 0x1c401a780(169) seed:1 YCC420f 601 alpha_one extent=[0 0 2016 1512] opaque

Answer 1

它在评论中，但这里是关于如何使用 Swift 4 设置对CIHueAdjust的调用的完整(和格式更好(的答案：

let filter = CIFilter(name: "CIHueAdjust")
let context = CIContext()
var extent: CGRect!
var scaleFactor: CGFloat!
@IBOutlet weak var img: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
let ciImage = CIImage(image: img.image!)
// Note: you may use kCIInputImageKey for inputImage
filter?.setValue(ciImage, forKey: "inputImage")
filter?.setValue(Float(1), forKey: "inputAngle")
let result = filter?.outputImage
var image = UIImage(cgImage: context.createCGImage(result!, from: result!.extent)!)
img.image = image
}