ios - 滑动返回只能在屏幕边缘使用吗？

Question

我的滑动返回功能有效，但仅在屏幕边缘有效。我怎样才能让它在屏幕上的任何地方工作？

Answer 1

实际上，在 UINavigationController 子类上执行此操作非常容易，无需对推送的每个 UIViewController 子类进行任何干预。同样尊重内置的从边缘滑动状态(因此当它被有意禁用时，新手势也被禁用):

import UIKit

class NavigationController: UINavigationController {
    override func viewDidLoad() {
        super.viewDidLoad()
        setupFullWidthBackGesture()
    }

    private lazy var fullWidthBackGestureRecognizer = UIPanGestureRecognizer()

    private func setupFullWidthBackGesture() {
        // The trick here is to wire up our full-width `fullWidthBackGestureRecognizer` to execute the same handler as
        // the system `interactivePopGestureRecognizer`. That's done by assigning the same "targets" (effectively
        // object and selector) of the system one to our gesture recognizer.
        guard
            let interactivePopGestureRecognizer = interactivePopGestureRecognizer,
            let targets = interactivePopGestureRecognizer.value(forKey: "targets")
        else {
            return
        }

        fullWidthBackGestureRecognizer.setValue(targets, forKey: "targets")
        fullWidthBackGestureRecognizer.delegate = self
        view.addGestureRecognizer(fullWidthBackGestureRecognizer)
    }
}

extension NavigationController: UIGestureRecognizerDelegate {
    func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        let isSystemSwipeToBackEnabled = interactivePopGestureRecognizer?.isEnabled == true
        let isThereStackedViewControllers = viewControllers.count > 1
        return isSystemSwipeToBackEnabled && isThereStackedViewControllers
    }
}