为什么在 iOS 11 中，我的 UIApplicationState 显示为非活动状态而不是活动状态？

Question

我已经更新到最新的 xcode - 9 和 iOS 11，现在我在 UIApplicationState 中遇到问题。谁能告诉我为什么苹果在 ApplicationState 中做了这个改变。

例如：在 viewController viewWillAppear 期间，我正在检查 UIApplicationState:

     UIApplicationState applicationState = [UIApplication sharedApplication].applicationState;
        if (applicationState == UIApplicationStateActive)
        {
        }

但是我得到了 applicationState = UIApplicationStateInactive。

或者 iOS11 版本需要额外代码单独处理:

  if (applicationState == UIApplicationStateActive || (@available(iOS 11, *) && applicationState == UIApplicationStateInactive)){
}

关于在所有版本中保持应用程序状态一致的任何其他答案？

提前致谢，

Answer 1

** 更新的答案 **

我使用以下代码在 iOS 10 和 iOS 11 设备上测试状态。

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        print("\(#function) active: \(UIApplication.shared.applicationState == .active)")
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        print("\(#function) active: \(UIApplication.shared.applicationState == .active)")
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        print("\(#function) active: \(UIApplication.shared.applicationState == .active)")

        DispatchQueue.main.asyncAfter(deadline: .now() + 0.25) {
            print("\(#function) with delay active: \(UIApplication.shared.applicationState == .active)")
        }
    }
}

当运行在 iOS 10:

viewDidLoad() active: false
viewWillAppear active: false
viewDidAppear active: true // This differs from 11
viewDidAppear with delay active: true

当运行在 iOS 11:

viewDidLoad() active: false
viewWillAppear active: false
viewDidAppear active: false
viewDidAppear with delay active: true

我不能告诉你这是有意还是无意，但肯定有些事情发生了变化。也许对其进行雷达检查？

为什么在 iOS 11 中，我的 UIApplicationState 显示为非活动状态而不是活动状态？

Why in iOS 11, my UIApplicationState show as inactive state instead of active?

ios

objective-c

ios11

uiapplication