Swift UIScrollViewDelegate不会触发scrollViewDidScroll事件

Question

我的UIScrollViews中有两个UIViewController，它们都有不同的属性，例如pagingEnabled，contentSize＆amp; contentInset我还需要它们在滚动时单独行动，所以我创建了两个单独的自定义类，如下所示。

class NavigationScrollView: UIScrollView{

}

class ContentScrollView: UIScrollView{

}

也代表

extension NavigationScrollView: UIScrollViewDelegate{
    // this method not triggers
    func scrollViewDidScroll(scrollView: UIScrollView) {

    }
}
extension ContentScrollView: UIScrollViewDelegate{
    // this method not triggers
    func scrollViewDidScroll(scrollView: UIScrollView) {

    }    
}

在主viewController viewDidLoad()我做

navigationScroller = NavigationScrollView(frame: CGRectMake(0.0, 0.0, frameWidth, 40.0))
contentScroller = ContentScrollView(frame: CGRectMake(0.0, 0.0, frameWidth, frameHeight))

Answer 1

你怎么用这种方式分配代表？

    class NavigationScrollView: UIScrollView{
        override func didMoveToSuperview() {
            super.didMoveToSuperview()
            self.delegate = self
        }
    }

    class ContentScrollView: UIScrollView{
        override func didMoveToSuperview() {
            super.didMoveToSuperview()
            self.delegate = self
        }
    }