UIPageViewController。如何设置自定义 UIViewControllers 数组

Question

我有一组 4 个 UIViewController，都有自己的自定义类，并且我设置了委托。到目前为止，我的主视图中有容器视图，这些视图被滚动到屏幕外，这就是我正在做一个“伪页面视图控制器”的方式。但是，为了培训，我想使用 UIPageViewController 将其转换为实际的页面视图控制器。
我看过一堆教程，但大多数人只使用一个视图控制器并更改其中的文本以显示多个。就我而言，我有 4 个自定义视图控制器：

var glanceController: GlanceVC!
var goalsController: GoalsVC!
var commuteController: CommuteVC!
var compareController: CompareVC!

在我之前的伪页面视图控制器上，我这样初始化它们：

func loadVC() {
    glanceController = self.storyboard?.instantiateViewController(withIdentifier: "sbGlance") as? GlanceVC
    goalsController = self.storyboard?.instantiateViewController(withIdentifier: "sbGoals") as? GoalsVC
    commuteController = self.storyboard?.instantiateViewController(withIdentifier: "sbCommute") as? CommuteVC
    compareController = self.storyboard?.instantiateViewController(withIdentifier: "sbCompare") as? CompareVC
}

现在据我了解，UIPageViewController 需要一组 UIViewController。但是我不能创建这个数组：

var VCArray: [UIViewController] = [glanceController, goalsController, commuteController, compareController]

错误：无法在属性初始化程序中使用实例成员“glancecontrolleer”。

我尝试改为声明一个空白数组 var VCArray: [UIViewcontroller] = [] 然后在

之后添加

func loadVC() {
    glanceController = self.storyboard?.instantiateViewController(withIdentifier: "sbGlance") as? GlanceVC
    goalsController = self.storyboard?.instantiateViewController(withIdentifier: "sbGoals") as? GoalsVC
    commuteController = self.storyboard?.instantiateViewController(withIdentifier: "sbCommute") as? CommuteVC
    compareController = self.storyboard?.instantiateViewController(withIdentifier: "sbCompare") as? CompareVC
    VCArray += glanceController
}

但是，这也有一个错误：“Argument Type @value glanceVC? 不符合预期的类型“Sequence”。

有人可以帮我为我的 uipageview 制作这个自定义视图控制器数组吗？

Answer 1

创建一个计算属性并返回视图控制器数组

var VCArray: [UIViewController] {
    if let glanceController = self.storyboard?.instantiateViewController(withIdentifier: "sbGlance") as? GlanceVC,
        let goalsController = self.storyboard?.instantiateViewController(withIdentifier: "sbGoals") as? GoalsVC,
        let commuteController = self.storyboard?.instantiateViewController(withIdentifier: "sbCommute") as? CommuteVC,
        let compareController = self.storyboard?.instantiateViewController(withIdentifier: "sbCompare") as? CompareVC {
            return [glanceController, goalsController, commuteController, compareController]
    }
    return []
}