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中做了此更改。
例如：在viewController viewWillAppear期间，我正在检查UIApplicationState：
UIApplicationState applicationState = [UIApplication sharedApplication].applicationState;
if (applicationState == UIApplicationStateActive)
{
}
但是我正在获得applicationState = UIApplicationStateInactive。
还是我需要通过额外的代码分别处理iOS 11版本：
if (applicationState == UIApplicationStateActive || (@available(iOS 11, *) && applicationState == UIApplicationStateInactive)){
}
还有其他答案可以在所有版本中始终保持应用程序状态吗？
提前致谢，
**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)")
}
}
}
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，但是肯定已经改变了。也许对它提起雷达？
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