iOS 13.0废弃'keyWindow'的解决方法

使用In Xcode 11 beta 4，提示keyWindow已经被iOS 13.0废弃：

'keyWindow' was deprecated in iOS 13.0: Should not be used for applications that support multiple scenes as it returns a key window across all connected scenes

解决方法

方法一：

UIApplication.shared.windows.filter {$0.isKeyWindow}.first

或者：

UIApplication.shared.windows.first { $0.isKeyWindow }

方法二：

let keyWindow = UIApplication.shared.connectedScenes
        .filter({$0.activationState == .foregroundActive})
        .map({$0 as? UIWindowScene})
        .compactMap({$0})
        .first?.windows
        .filter({$0.isKeyWindow}).first

使用：

keyWindow?.endEditing(true)