使用ScrollView在图像的同时滚动文本

Question

我正在尝试在用户首次启动应用程序时实现SlideShow并且一切正常，我可以在图像之间滚动，当我滑动时文本会发生变化，但是存在问题。文本不会与图像同时滑动，只会在我停止滑过屏幕时发生变化。

我想要做的是在滚动图像的同时滚动标签和文字。我知道解决方法是将文本放在图像上，但在这种特殊情况下，它不适合我。有没有办法让视图中的元素与图像同时滚动？

到目前为止我得到了什么：

class SlidesViewController: UIViewController, UIScrollViewDelegate {

@IBOutlet var scrollView: UIScrollView!
@IBOutlet var titleView: UILabel!
@IBOutlet var textView: UITextView!
@IBOutlet var pageControl: UIPageControl!

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
    //1
    self.scrollView.frame = CGRect(x:0, y:0, width:self.view.frame.width, height:self.view.frame.height)
    let scrollViewWidth:CGFloat = self.scrollView.frame.width
    let scrollViewHeight:CGFloat = self.scrollView.frame.height
    //2
    textView.textAlignment = .center
    textView.text = "Sweettutos.com is your blog of choice for Mobile tutorials"
    textView.textColor = .red
    //3
    let imgOne = UIImageView(frame: CGRect(x:0, y:0,width:scrollViewWidth, height:scrollViewHeight))
    imgOne.image = UIImage(named: "slide1")
    let imgTwo = UIImageView(frame: CGRect(x:scrollViewWidth, y:0,width:scrollViewWidth, height:scrollViewHeight))
    imgTwo.image = UIImage(named: "slide2")
    let imgThree = UIImageView(frame: CGRect(x:scrollViewWidth*2, y:0,width:scrollViewWidth, height:scrollViewHeight))
    imgThree.image = UIImage(named: "slide3")
    let imgFour = UIImageView(frame: CGRect(x:scrollViewWidth*3, y:0,width:scrollViewWidth, height:scrollViewHeight))
    imgFour.image = UIImage(named: "slide4")

    self.scrollView.addSubview(imgOne)
    self.scrollView.addSubview(imgTwo)
    self.scrollView.addSubview(imgThree)
    self.scrollView.addSubview(imgFour)
    //4
    self.scrollView.contentSize = CGSize(width:self.scrollView.frame.width * 4, height:self.scrollView.frame.height)
    self.scrollView.delegate = self
    self.pageControl.currentPage = 0
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func scrollViewDidEndDecelerating(_ scrollView: UIScrollView){
    // Test the offset and calculate the current page after scrolling ends
    let pageWidth:CGFloat = scrollView.frame.width
    let currentPage:CGFloat = floor((scrollView.contentOffset.x-pageWidth/2)/pageWidth)+1
    // Change the indicator
    self.pageControl.currentPage = Int(currentPage);
    // Change the text accordingly
    if Int(currentPage) == 0{
        textView.text = "Description of slide 1"
        titleView.text = "Text Silde 1"
    }else if Int(currentPage) == 1{
        textView.text = "Description of slide 2"
        titleView.text = "Text Silde 2"
    }else if Int(currentPage) == 2{
        textView.text = "Description of slide 3"
        titleView.text = "Text Silde 3"
        pageControl.isHidden = false
    }else {
        textView.text = "Description of slide 4"
        titleView.text = "Text Silde 3"
        pageControl.isHidden = true
    }
}

}