ios - 自定义 PageControl 图像 - Swift

Question

我正在尝试为 UIPageControl 点设置图像。

我需要更改默认点，而不是我需要一张图片。我使用了下面的代码

self.pageCtrl.currentPageIndicatorTintColor = UIColor.init(patternImage: UIImage(named: "Page Indicator_Selected")!)
self.pageCtrl.pageIndicatorTintColor = UIColor.init(patternImage: UIImage(named: "Page Indicator_Normal")!)

我可以在 Pagecontrol 中设置图像，但它与默认点重叠。

Answer 1

Politta 建议的代码不适用于 iOS 14，因为 Apple 为 UIPageControll 引入了一些新的 API。

详情看这里UIPageControls New APIs

这是支持 iOS 14 的更新代码

class CustomPageControl: UIPageControl {

@IBInspectable var currentPageImage: UIImage?

@IBInspectable var otherPagesImage: UIImage?

override var numberOfPages: Int {
    didSet {
        updateDots()
    }
}

override var currentPage: Int {
    didSet {
        updateDots()
    }
}

override func awakeFromNib() {
    super.awakeFromNib()
    if #available(iOS 14.0, *) {
        defaultConfigurationForiOS14AndAbove()
    } else {
        pageIndicatorTintColor = .clear
        currentPageIndicatorTintColor = .clear
        clipsToBounds = false
    }
}

private func defaultConfigurationForiOS14AndAbove() {
    if #available(iOS 14.0, *) {
        for index in 0..<numberOfPages {
            let image = index == currentPage ? currentPageImage : otherPagesImage
            setIndicatorImage(image, forPage: index)
        }

        // give the same color as "otherPagesImage" color.
        pageIndicatorTintColor = .gray
        
        // give the same color as "currentPageImage" color.
        currentPageIndicatorTintColor = .red 
        /*
         Note: If Tint color set to default, Indicator image is not showing. So, give the same tint color based on your Custome Image.
        */
    }
}

private func updateDots() {
    if #available(iOS 14.0, *) {
        defaultConfigurationForiOS14AndAbove()
    } else {
        for (index, subview) in subviews.enumerated() {
            let imageView: UIImageView
            if let existingImageview = getImageView(forSubview: subview) {
                imageView = existingImageview
            } else {
                imageView = UIImageView(image: otherPagesImage)
                
                imageView.center = subview.center
                subview.addSubview(imageView)
                subview.clipsToBounds = false
            }
            imageView.image = currentPage == index ? currentPageImage : otherPagesImage
        }
    }
}

private func getImageView(forSubview view: UIView) -> UIImageView? {
    if let imageView = view as? UIImageView {
        return imageView
    } else {
        let view = view.subviews.first { (view) -> Bool in
            return view is UIImageView
        } as? UIImageView

        return view
    }
}
}