在Swift 2中没有关于segue的后退按钮 [英] No back button on segue in Swift 2

问题描述

我刚将我的项目移植到Swift 2，一切都运行良好 - 除了最简单的segues没有后退按钮。以下是我正在使用的segue函数的准备：

I just ported my project over to Swift 2, and everything is working great - except that even the most simple segues have no back button. Here is the prepare for segue function that I am using:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
    if segue.identifier == "showExercise" {
        if let nav = segue.destinationViewController as? UINavigationController {
            if let exercisesController = nav.topViewController as? ExercisesController {
                let cell = sender as! WorkoutCell
                if let workout = cell.name!.text {
                    exercisesController.exercises = Workouts[workout]!
                    exercisesController.navigationItem.title = workout
                }
            }
        }
    }
}

之前，父segue的后退按钮用于自动填充。现在，我得到的只是儿童导航中的标题vc

Before, the back button to the parent segue used to automatically populate. Now, all I get is the title in the child navigation vc

推荐答案

你使用show或show detail segue吗？看起来你正在使用模态segue。 show或show segue的目标视图控制器通常是第二个视图控制器本身，而不是嵌入另一个 UINavigationController 。

Are you using show or show detail segue? It seems like you are using a modal segue. Destination view controller for show or show segue is usually the second view controller itself, and not embedded in another UINavigationController.

如果show segue的目标视图控制器实际上是 UINavigationController ，则新导航控制器的导航栏设置可能会覆盖旧的导航栏设置（源视图控制器的导航控制器） 。尽量不要将目标视图控制器嵌入另一个 UINavigationController 。

If your destination view controller for the show segue is really a UINavigationController, the new navigation controller's navigation bar settings may override the old one (the navigation controller of the source view controller). Try not embedding your destination view controller in another UINavigationController.

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