Accessing a function inside a class function in Swift - ios

Question

How would I call darkness and put parameters in it?
class imageProcesses {
class func DefaultProcesses() {
func CompleteDarkness(image: UIImage) -> UIImage {
let dark = Darken(124, image: image)
return dark
}
}
}
iv'e tried this:
ImageProcessor.DefaultProcesses().CompleteDarkness(image!)
but it doesn't work

Answer 1

You can't call a nested function from outside. Move it out to a class function:
class imageProcesses {
class func CompleteDarkness(image: UIImage) -> UIImage {
let dark = Darken(124, image: image)
return dark
}
class func DefaultProcesses() {
// ...
}
}

Answer 2

Why are you declaring a function inside of a function anyway?
class imageProcesses {
class func DefaultProcesses(image: UIImage) {
completeDarkness(image: image)//calls completeDarkness.
}
func CompleteDarkness(image: UIImage) -> UIImage {
let dark = Darken(124, image: image)
return dark
}
}
Later call
ImageProcessor.DefaultProcesses(image: image!)//Now calling DefaultProcesses will run Complete Darkness and anything else you put in there.

Answer 3

Think this is what you want you can stick that in the play ground and have a go with it
func Darken(input:Int, image:UIImage) -> UIImage{
return UIImage()
}
class ImageProcesses {
class func DefaultProcesses() -> ((UIImage) -> UIImage){
func CompleteDarkness(image: UIImage) -> UIImage {
let dark = Darken(124, image: image)
return dark
}
return CompleteDarkness
}
}
let image = UIImage()
ImageProcesses.DefaultProcesses()(image)