NSNotification.Name.didBecomeActiveNotification 未找到

Question

我正在 Xcode 10.1 上使用 10.14 部署目标开发 macOS 应用程序。根据文档，应该有 NSNotification.Name.didBecomeActiveNotification，但构建失败并出现 Type 'NSNotification.Name?' has no member 'didBecomeActiveNotification' 错误。我导入了 Cocoa、AppKit 和 Foundation。相关代码如下：

NotificationCenter.default.addObserver(forName: .didBecomeActiveNotification, object: nil, queue: nil) { notification in
    print("\(notification)")
}

有什么问题？

Answer 1

现在是 class 属性的 NSApplication

NotificationCenter.default.addObserver(forName: NSApplication.didBecomeActiveNotification, object: nil, queue: nil) { notification in

NSNotification.Name.didBecomeActiveNotification 未找到

NSNotification.Name.didBecomeActiveNotification not found

swift

macos

nsnotifications

notificationcenter