change the contrast and brightness of image using slider - ios

Question

I am trying to change the contrast and brightness of an image using the slider, and I have created a slider programatically. When I am trying to vary the contrast by the slider, am getting an error like
reason: '-[UISlider floatValue]: unrecognized selector sent to instance 0x103c4ffa0'`func viewforslide(){
vieew.frame = CGRect.init(x: 10, y:view.frame.size.height - 180, width: self.view.frame.size.width - 20, height: 40)
vieew.backgroundColor = UIColor.lightGray
vieew.layer.cornerRadius = vieew.frame.size.height/2
view.addSubview(vieew)
createslider()
}
func createslider(){
var sliderDemo = UISlider(frame:CGRect(x: 15, y: 5, width: vieew.frame.size.width - 30, height: 30))
sliderDemo.minimumValue = 0.0
sliderDemo.maximumValue = 1000.0
sliderDemo.isContinuous = true
sliderDemo.tintColor = UIColor.black
sliderDemo.value = 500.0
sliderDemo.addTarget(self, action: #selector(_sldComponentChangedValue),for: .valueChanged)
vieew.addSubview(sliderDemo)
}
#IBAction func _sldComponentChangedValue(sender: UISlider) {
// Set value to the nearest int
sender.setValue(Float(roundf(sender.value)), animated: false)
let newvalforslider = sender
print("\(newvalforslider)")
let displayinPercentage: Int = Int((sender.value/200) * 10000)
// contrastValueLabel.text = ("\(displayinPercentage)")
self.imageView.image = results.enhancedImage
let beginImage = CIImage(image: self.imageView.image!)
let filter = CIFilter(name: "CIColorControls")
filter?.setValue(beginImage, forKey: kCIInputImageKey)
filter?.setValue(sender.value, forKey: kCIInputContrastKey)
var filteredImage = filter?.outputImage
var context = CIContext(options: nil)
imageView.image = UIImage(cgImage: context.createCGImage(filteredImage!, from: (filteredImage?.extent)!)!)
var sliderValue = sender.value
}
`
If anyone helps me to do this, would be great. Thanks in advance.

Answer 1

While adding target method to sliderDemo you have given selector (_sldComponentChangedValue), which is not right, your actual method does receives an argument. That's the difference in methods name, so on slide you gets crash saying "unrecognized selector sent to instance"
instead do as follows
sliderDemo.addTarget(self, action: #selector(_sldComponentChangedValue(sender:)), for: .valueChanged);

Answer 2

#anisha If you complicate previous Ans. try this new code.
func increaseContrast(_ image: UIImage) -> UIImage {
let inputImage = CIImage(image: image)!
let parameters =
[
"inputContrast": NSNumber(value: 2) // set how many contrast you want
]
let outputImage = inputImage.applyingFilter("CIColorControls",
parameters: parameters)
let context = CIContext(options: nil)
let img = context.createCGImage(outputImage, from: outputImage.extent)!
return UIImage(cgImage: img)
}