UIPageControl custom class - found nil changing image to the dots - ios

Question

I need to implement a UIPageControl with custom images instead the normal dot. So I create a custom class and connect it through the storyboard.
Since ios7 the subview of UIPageControl contain UIView instead of UIImageView. The subviews of the resulting UIView(UIIpageControl subviews) doesn't contain any subviews so I receive the error:
fatal error: unexpectedly found nil while unwrapping an Optional value.
Where I might have been wrong?
class WhitePageControl:UIPageControl{
let activeImage = UIImage(named: "dot_white")
let inactiveImage = UIImage(named: "dot_white_e")
override init(frame: CGRect){
super.init(frame: frame)
}
required init(coder aDecoder: NSCoder){
super.init(coder: aDecoder)
}
func updateDots(){
println(self.subviews.count) // 3
println(self.numberOfPages) // 3
for var index = 0; index < self.subviews.count; index++ {
println(index)
var dot:UIImageView!
var dotView:UIView = self.subviews[index] as UIView
println("1")
for subview in dotView.subviews{ // NIL HERE
println("2")
if subview.isKindOfClass(UIImageView){
println("3")
dot = subview as UIImageView
if index == self.currentPage{ dot.image = activeImage }
else{ dot.image = inactiveImage }
}
}
}
}
func setCurrentPage(value:Int){
super.currentPage = value
self.updateDots()
}
}

Answer 1

It's my solution:
import Foundation
class PageControl: UIPageControl {
var activeImage: UIImage!
var inactiveImage: UIImage!
override var currentPage: Int {
//willSet {
didSet { //so updates will take place after page changed
self.updateDots()
}
}
convenience init(activeImage: UIImage, inactiveImage: UIImage) {
self.init()
self.activeImage = activeImage
self.inactiveImage = inactiveImage
self.pageIndicatorTintColor = UIColor.clearColor()
self.currentPageIndicatorTintColor = UIColor.clearColor()
}
func updateDots() {
for var i = 0; i < count(subviews); i++ {
var view: UIView = subviews[i] as! UIView
if count(view.subviews) == 0 {
self.addImageViewOnDotView(view, imageSize: activeImage.size)
}
var imageView: UIImageView = view.subviews.first as! UIImageView
imageView.image = self.currentPage == i ? activeImage : inactiveImage
}
}
// MARK: - Private
func addImageViewOnDotView(view: UIView, imageSize: CGSize) {
var frame = view.frame
frame.origin = CGPointZero
frame.size = imageSize
var imageView = UIImageView(frame: frame)
imageView.contentMode = UIViewContentMode.Center
view.addSubview(imageView)
}
}

Answer 2

change setCurrentPage to Current Page ,bcoz that one is Obj C property
func currentPage(page: Int) {
super.currentPage = page
self.updateDots()
}
try this.