现在已经在 swift 上工作了一段时间,但在处理这个 Core Image Framework 时遇到了麻烦。我能够成功地在图像上创建 CIFilter,但是我不确定如何删除它。图像放置在类似于 snapchat 的相机屏幕的 UIView 上,然后有一个 imageview,它是预览图像的 uiview 的 subview 。顺便说一句,还使用最新版本的 Xcode 和 iOS。
这是应用黑白滤镜时的代码:
@IBAction func BW_Flt_Bt_Tapped(sender: UIButton) {
let beginImage = CIImage(image: imagePreview.image!)
let ciContext = CIContext(options: nil)
let filter = CIFilter(name: "CIPhotoEffectNoir")
var imgOrientation = imagePreview.image!.imageOrientation
var imgScale = imagePreview.image?.scale
filter!.setDefaults()
filter!.setValue(beginImage, forKey: kCIInputImageKey)
let filteredImageData = filter!.valueForKey(kCIOutputImageKey) as! CIImage
let filteredImageRef = ciContext.createCGImage(filteredImageData, fromRect: filteredImageData.extent)
imagePreview.image = UIImage(CGImage: filteredImageRef, scale: 1.0, orientation: UIImageOrientation.Right)
self.orgImgBt.hidden = false
self.orgImgL.hidden = false
BWFlt.hidden = true
BWLbl.hidden = true
}
-imagePreview是UIView的子view
接下来是我如何将图像改回的代码
@IBAction func orgImgPressed(sender: UIButton) {
self.imagePreview.image = self.selctedImage
orgImgBt.hidden = true
orgImgL.hidden = true
`enter code here` BWFlt.hidden = false
`enter code here`BWLbl.hidden = false
print("button was pressed")
}
如果有人有任何建议,我将不胜感激,谢谢!
最佳答案
您可以通过将先前的值保存在变量中来实现此目的,或者如果您有多个过滤器,则可以将这些值保存在字典中。当您应用新过滤器或更改现有过滤器的值时,只需将该值替换为新值并将所有值应用于原始 CIImage
例如,
var allFilters = [String: [String: Any]]()
var currentImage: CIImage!
let kCIColorControls = "CIColorControls"
override func viewDidLoad() {
super.viewDidLoad()
currentImage = CIImage(image: self.originalImage!)
}
func applyAvailableFilters() {
if self.allFilters.count > 0 {
DispatchQueue.global(qos: .background).async {
var outputImage: CIImage!
self.blurFilter = CIFilter.init(name: "CIGaussianBlur")
self.brightnessFilter = CIFilter.init(name: "CIColorControls")
self.cropFilter = CIFilter.init(name: "CICrop")
if let blurProperty = self.allFilters[self.kCIGaussianBlur]?.first {
self.blurFilter.setValue(blurProperty.value, forKey: blurProperty.key)
self.blurFilter.setValue(self.currentImage, forKey: kCIInputImageKey)
outputImage = self.blurFilter.outputImage
}
if let brightnessProperty = self.allFilters[self.kCIColorControls]?.first {
self.brightnessFilter.setValue(brightnessProperty.value, forKey: brightnessProperty.key)
if let outputImage = self.blurFilter.outputImage {
self.brightnessFilter.setValue(outputImage, forKey: kCIInputImageKey)
} else {
self.brightnessFilter.setValue(self.currentImage, forKey: kCIInputImageKey)
}
outputImage = self.brightnessFilter.outputImage
}
if let cropProperty = self.allFilters[self.kCICrop]?.first {
self.cropFilter.setValue(cropProperty.value, forKey: cropProperty.key)
if let outputImage = self.brightnessFilter.outputImage {
self.cropFilter.setValue(outputImage, forKey: kCIInputImageKey)
} else if let outputImage = self.blurFilter.outputImage {
self.cropFilter.setValue(outputImage, forKey: kCIInputImageKey)
} else {
self.cropFilter.setValue(self.currentImage, forKey: kCIInputImageKey)
}
outputImage = self.cropFilter.outputImage
}
if let image = outputImage {
let openGLContext = EAGLContext(api: .openGLES2)
let context = CIContext(eaglContext: openGLContext!)
if let cgimg = context.createCGImage(image, from: image.extent) {
let processedImage = UIImage(cgImage: cgimg)
DispatchQueue.main.async {
self.imageView.image = processedImage
}
}
} else {
DispatchQueue.main.async {
self.imageView.image = self.selectedImage
}
}
}
} else {
DispatchQueue.main.async {
self.imageView.image = self.selectedImage
}
}
}
然后像这样应用你的滤镜(模糊滤镜)
@IBAction func sliderValueChanged(_ sender: UISlider) {
if sender.value == 0 {
_ = allFilters.removeValue(forKey: kCIGaussianBlur)
} else {
allFilters[kCIGaussianBlur] = [kCIInputRadiusKey: sender.value]
}
if allFilters[kCICrop]?.first == nil {
allFilters[kCICrop] = ["inputRectangle": CIVector(cgRect: self.currentImage.extent)]
}
applyAvailableFilters()
}
关于ios - Swift 无法从 UIImage 中删除 CIFILter,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39188831/