change page Indicator Image [SMPageControl] / EAIntroView in swift - ios

Question

I'm trying to change the indicator image , following the example in EAIntroView
here is the objective-c code from EAIntroView
SMPageControl *pageControl = [[SMPageControl alloc] init];
pageControl.pageIndicatorImage = [UIImage imageNamed:#"pageDot"];
pageControl.currentPageIndicatorImage = [UIImage imageNamed:#"selectedPageDot"];
[pageControl sizeToFit];
intro.pageControl = (UIPageControl *)pageControl;
intro.pageControlY = 130.f;
and here is the swift code I'm trying to implement
// SMPageControl
pageControl = SMPageControl()
pageControl.pageIndicatorImage = UIImage(named: "pageDot")
pageControl.currentPageIndicatorImage = UIImage(named: "selectedPageDot")
pageControl.sizeToFit()
pageControl.backgroundColor = UIColor.clearColor()
intro.pageControl = pageControl as? UIPageControl
swift code has a warning here
intro.pageControl = pageControl as? UIPageControl
the warning is :
Cast from 'SMPageControl!' to unrelated type 'UIPageControl' always fails
any help ?

Answer 1

For changing page Indicator Image [SMPageControl] / EAIntroView in swift I have created custom class of UIPageControl like below:
import UIKit
class CustomPageControl: UIPageControl {
let activePage: UIImage = UIImage(named: "icon-selected-dot")!
let inActivePage: UIImage = UIImage(named: "icon-dot")!
override var numberOfPages: Int {
didSet {
updateDots()
}
}
override var currentPage: Int {
didSet {
updateDots()
}
}
override func awakeFromNib() {
super.awakeFromNib()
self.pageIndicatorTintColor = UIColor.clear
self.currentPageIndicatorTintColor = UIColor.clear
self.clipsToBounds = false
}
func updateDots() {
var i = 0
for view in self.subviews {
var imageView = self.imageView(forSubview: view)
if imageView == nil {
if i == self.currentPage {
imageView = UIImageView(image: activePage)
} else {
imageView = UIImageView(image: inActivePage)
}
imageView!.center = view.center
view.addSubview(imageView!)
view.clipsToBounds = false
}
if i == self.currentPage {
imageView!.alpha = 1.0
imageView?.image = activePage
} else {
imageView!.alpha = 0.5
imageView?.image = inActivePage
}
i += 1
}
}
fileprivate func imageView(forSubview view: UIView) -> UIImageView? {
var dot: UIImageView?
if let dotImageView = view as? UIImageView {
dot = dotImageView
} else {
for foundView in view.subviews {
if let imageView = foundView as? UIImageView {
dot = imageView
break
}
}
}
return dot
}
}
then in your class just add these lines and you can use custom images for dot
//Custom page Control
let pageControl = CustomPageControl()
pageControl.updateDots()
intro.pageControl = pageControl
Hope it will work for you! #ynamao

Answer 2

You can see from the source code of SMPageControl that it isn't a subclass of UIPageControl. Which means the error is expected: UIPageControl is a completely unrelated type, to which the value cannot be cast.
The Objective-C you pointed to might work, but it's bad and wrong: inline cast to UIPageControl achieves nothing here and can cause internal inconsistencies.
This is exactly the kind of sloppiness that Swift compiler is designed to prevent, and it's doing its job well.
Your best bet is to forgo using this library in Swift code.