自定义后退按钮标题 "Replace" Segue

Question

我有一个自定义的 "Replace" segue，它用另一个替换了当前的 viewcontroller。这很好用。然而，后退按钮标题总是变成 "Back"。 segue 是这样工作的：

ViewController A -> ViewController B

ViewController B 然后执行到 ViewController C 的替换 segue。然后堆栈是：

ViewController A -> ViewController C

这是 ReplaceSegue.swift 的代码：

public class ReplaceSegue: UIStoryboardSegue
{
    public var animated = true

    public override func perform()
    {
        let navigationController: UINavigationController = sourceViewController.navigationController!

        var controllerStack = navigationController.viewControllers
        let index = controllerStack.indexOf(sourceViewController)
        controllerStack[index!] = destinationViewController

        navigationController.setViewControllers(controllerStack, animated: animated)
    }
}

我的 ViewController:

func replaceAgendaViewController()
{
    let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
    let agendaViewController = mainStoryboard.instantiateViewControllerWithIdentifier("AgendaViewController") as! AgendaViewController
    let segue = ReplaceSegue(identifier: replaceSegueId, source: self, destination: agendaViewController) { () -> Void in

    }
    segue.animated = false
    segue.perform()
}

已尝试此代码，但我理解为什么它不起作用，因为它在被替换的 ViewController 上设置了导航项：

navigationItem.backBarButtonItem = UIBarButtonItem(title: " ", style: UIBarButtonItemStyle.Plain, target: nil, action: nil)

我也不想在执行 segue 之前设置后退按钮标题，因为 ViewController 包含其他可能不需要该后退按钮标题的 segue。有什么建议吗？

Answer 1

修复起来很容易，我只是将代码添加到 ViewController 中的 prepareForSegue:sender: A:

public override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
{
    switch (segue.identifier!) {
    case agendaSegueId:
        navigationItem.backBarButtonItem = UIBarButtonItem(title: " ", style: UIBarButtonItemStyle.Plain, target: nil, action: nil) 
        ...
    }
}

自定义后退按钮标题 "Replace" Segue

Back button title on custom "Replace" Segue

uiviewcontroller

uinavigationcontroller

uinavigationitem

ios

segue