ios - 检测 applicationWillEnterForeground 中存在哪个 View

Question

我想知道当应用程序进入前台时出现哪个 View 。

这怎么可能？

func applicationWillEnterForeground(_ application: UIApplication) {

            if (storyboardID == "myview") {

               //do sth

            }

        }

Answer 1

func getCurrentViewController() -> UIViewController? {

      if let rootController = UIApplication.shared.keyWindow?.rootViewController {
      var currentController: UIViewController! = rootController
         while (currentController.presentedViewController != nil) {
                currentController = currentController.presentedViewController
            }
            return currentController
        }
        return nil
    }

使用上面的代码你会得到当前的View Controller。

使用示例

func applicationWillEnterForeground(_ application: UIApplication) {
    if let storyboardID = getCurrentViewController()?.restorationIdentifier, 
           storyboardID == "myview") {
           //do sth
        }
    }