Question

我有一个带有四个标签的UIPageViewController。三个表和一个webview。问题是垂直滚动对它们不起作用。如何使用swift解决这个问题？

这是我的代码：

func createTxtPageViewController() {

        let pageController = self.storyboard!.instantiateViewControllerWithIdentifier("pagetxtController") as! UIPageViewController
        pageController.dataSource = self
        pageController.delegate = self

        if texts.count > 0 {
            let firstController = getItemTxtController(0)!
            let startingViewControllers = [firstController]
            pageController.setViewControllers(startingViewControllers, direction: UIPageViewControllerNavigationDirection.Forward, animated: false, completion: nil)
        }

        pageTxtViewController = pageController
        pageTxtViewController?.view.frame = CGRectMake(10, 173, self.rightView.frame.size.width - 20, self.rightView.frame.size.height - 183)

        addChildViewController(pageTxtViewController!)
        self.rightView.addSubview(pageTxtViewController!.view)
        pageTxtViewController!.didMoveToParentViewController(self)
    }

Answer 1

如果您添加了PanGestureRecognizer，它会尝试覆盖tableView的手势识别器，您必须使用UIGestureRecognizerDelegate进行手动检查。

let pangGesture = UIPanGestureRecognizer(target: self, action: #selector(createTxtPageViewController(recognizer:)))
pangGesture.delegate = self
self.view.addGestureRecognizer(pangGesture)

然后你必须实现gestureRecongizerShouldBegin委托函数

func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {

    // we check for panGesture if it's panGesture we continue if not return        
    guard let recognizer = gestureRecognizer as? UIPanGestureRecognizer  else {
        return true
    }

    // The velocity of the pan gesture in the coordinate system of the specified view. 
    let velocity = recognizer.velocity(in: self.view)

    // If velocity.y is greater than velocity.x user is trying to scroll tableView else user wants to swipe to next screen
    return abs(velocity.y) > abs(velocity.x) ? false : true
}

在类的顶部为touchLocation声明一个CGPoint属性

var panStartPoint: CGPoint!

现在在 createTxtPageViewController 功能中检查状态并检测用户向左或向右滑动方向

func createTxtPageViewController(recognizer: UIPanGestureRecognizer) {


    switch recognizer.state {
    case .began:
        touchLocation = recognizer.location(in: self.view)
    case .changed:
        let currentPoint = recognizer.location(in: self.view)
        let swipingLeft = currentPoint.x < touchLocation.x ? true : false

        if !swipingLeft {
            // swiped right
            //TODO: Add your logic for navigation to nextViewController
        } else {
            // swiped left
            //TODO: Add your logic for navigation to nextViewController
        }
        // you can check for other states as well and clean up after your self e.g state.cancelled I just break
    default:
        break
    }

}

UIPageViewController：表垂直滚动不起作用

1 个答案: