迅速UIScrollViewDelegate不触发scrollViewDidScroll事件

Question

我的UIViewController中有两个UIViewController，它们都有不同的属性，比如pagingEnabled、contentSize和contentInset，我还需要它们在滚动时分别运行，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{

}

还有代表们

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

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

    }    
}

在main viewController viewDidLoad()中，我知道

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

Answer 1

以这种方式分配委托如何？

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

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