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面临问题.任何人都可以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)
        {
        }

但我得到applicationState = UIApplicationStateInactive.

或者我需要通过额外代码单独处理iOS 11版本:

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

在所有版本中保持应用程序状态的任何其他答案？

提前致谢,

Answer 1

**更新答案**

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)")
        }
    }
}

在 iOS 10 上运行时：

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

在 iOS 11 上运行时：

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

我不能告诉你这是否是故意的，但肯定已经发生了一些变化。也许在上面提交雷达？