问创建垂直UIPageControl

EN

pageControl.transform = pageControl.transform.rotated(by: .pi/2)

//create page control

    private let pageControl: UIPageControl = {
    let pageControl = UIPageControl()
    pageControl.numberOfPages = 3
    return pageControl
}()

//add page control as a subview to container UIView

override func viewDidLoad() {
     pageViewContainer.addSubview(pageControl)
}

//rotate it vertically

override func viewWillLayoutSubviews() {
    pageControl.frame = pageViewContainer.bounds
    pageControl.subviews.last?.transform = CGAffineTransform(rotationAngle: CGFloat.pi/2)
    pageControl.subviews.first?.transform = CGAffineTransform(rotationAngle: CGFloat.pi/2)
}