如何在UITabBarController中加载所有视图？ [英] How to load all views in UITabBarController?

问题描述

我在与此问题相关的帖子中找不到相关和最新的答案。

I have not found relevant and up to date answers in the posts related to this question.

我想在启动时加载所有viewcontrollers。目前按预期启动，但是当我点击一个条形项目（第一次）时，加载它会有一点延迟，因为它尚未加载。

I would like to load all viewcontrollers on launch. Currently it launches as expected but when I tap on a bar item (the first time) there is a slight delay to load it because it has not been loaded yet.

如何我能做到的是Swift吗？

How can I do that is Swift ?

谢谢。

推荐答案

To预加载 UIViewController 的视图，只需访问其视图属性：

To preload a UIViewController's view, simply access its view property:

let _ = myViewController.view

预加载 UITabBarController 上的所有视图控制器，你可以这样做：

To preload all view controllers on a UITabBarController, you can do:

if let viewControllers = tabBarController.viewControllers {
    for viewController in viewControllers {
        let _ = viewController.view
    }
}

或更紧凑：

tabBarController.viewControllers?.forEach { let _ = $0.view }

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