代表不再被称为 swift

Posted 2023-03-13

【中文标题】代表不再被称为 swift

【英文标题】：Delegate stops being called swift

【发布时间】：2019-06-23 20:51:37

【问题描述】：

我有一个委托，用于触发 Pageview 控制器的下一页，并且我有 6 个视图控制器连接到页面视图控制器。在 3 个不同的控制器中的前 3 次调用之后，委托停止被调用，因此，页面控制器的下一页没有被触发，下面是我的代码，它适用于前 3 个并且在前 3 个之后停止被调用

此按钮点击代码位于 5 个 viewcontrollers 中，pageIndex 设置在每个 1..5 中

   weak var delegate: NextDelegate?

    nextBtn.rx.tap.asDriver().drive(onNext: 
        guard let delegate = self.delegate else return
        delegate.next(pageIndex: 1)
    ).disposed(by: disposeBag)

    backBtn.rx.tap.asDriver().drive(onNext: 
        guard let delegate = self.delegate else return
        delegate.previous(pageIndex: 1)
    ).disposed(by: disposeBag)

我的协议和方法

lazy var controllers: [UIViewController] = 
        let locVC = LocationVC()
        locVC.delegate = self
        let typeVC = TypeVC()
        typeVC.delegate = self
        let descVC = DescVC()
        descVC.delegate = self
        let priceVC = PriceVC()
        descVC.delegate = self
        let featuresVC = FeaturesVC()
        featuresVC.delegate = self
        let picturesVC = PicturesVC()
        picturesVC.delegate = self
        return [locVC,
                typeVC, descVC, priceVC, featuresVC, picturesVC]
    ()


func backBtnClicked(index: Int) 

    guard index - 1 >= 0 else  return 
    pageController.setViewControllers([controllers[index - 1]], direction: .reverse, animated: false, completion: nil)


func nextBtnClicked(index: Int) 
    log("\(controllers.count)", .happy)
    guard index + 1 < controllers.count else  return 
    pageController.setViewControllers([controllers[index + 1]], direction: .forward, animated: false, completion: nil)



extension ViewController: NextDelegate 
    func next(pageIndex: Int) 
        print("nexteddddd \(pageIndex)")
        nextBtnClicked(index: pageIndex)
    

    func previous(pageIndex: Int) 
        print("backedddd \(pageIndex)")
        backBtnClicked(index: pageIndex)
    


protocol NextDelegate: AnyObject 
    func next(pageIndex: Int)
    func previous(pageIndex: Int)

【参考方案1】：

问题可能与您在此处设置静态索引 1 的事实有关

nextBtn.rx.tap.asDriver().drive(onNext: 
    guard let delegate = self.delegate else return
    delegate.next(pageIndex: 1)
).disposed(by: disposeBag)

backBtn.rx.tap.asDriver().drive(onNext: 
    guard let delegate = self.delegate else return
    delegate.previous(pageIndex: 1)
).disposed(by: disposeBag)

相反，您需要在每个 vc 中都有一个索引 var，并在实例化 vc 时分配它，这样您就可以在上面使用它或在主寻呼机中使用 vaibale

---

修复它

var current = 0 // assuming you set first vc initially 

 nextBtn.rx.tap.asDriver().drive(onNext: 
    guard let delegate = self.delegate else return
    delegate.next(pageIndex:self.current)
).disposed(by: disposeBag)

backBtn.rx.tap.asDriver().drive(onNext: 
    guard let delegate = self.delegate else return
    delegate.previous(pageIndex:self.current)
).disposed(by: disposeBag)


func backBtnClicked(index: Int) 

    guard index - 1 >= 0 else  return 
    self.current = index - 1
    pageController.setViewControllers([controllers[index - 1]], direction: .reverse, animated: false, completion: nil)


func nextBtnClicked(index: Int) 
    log("\(controllers.count)", .happy)
    guard index + 1 < controllers.count else  return 
    self.current = index + 1
    pageController.setViewControllers([controllers[index + 1]], direction: .forward, animated: false, completion: nil)

【讨论】：

没有办法获取MainVC中每个索引的值