NSStatusBar + Swift:标题显示并立即消失

Question

我想为 macOS 制作状态栏，但在我运行应用程序标题后显示并立即消失

func applicationDidFinishLaunching(_ aNotification: Notification) {
        // Insert code here to initialize your application
        let statusItem = NSStatusBar.system().statusItem(withLength: NSVariableStatusItemLength)
        statusItem.title = "Hello"
    }

我认为参考文献有问题，但不知道如何解决这个问题。

Answer 1

事实上，您需要对状态项的强引用

var statusItem : NSStatusItem!
func applicationDidFinishLaunching(_ aNotification: Notification) {
        // Insert code here to initialize your application
        statusItem = NSStatusBar.system().statusItem(withLength: NSVariableStatusItemLength)
        statusItem.title = "Hello"
}

但是我建议使用闭包来初始化状态项

let statusItem : NSStatusItem = {
    let item =  NSStatusBar.system().statusItem(withLength: NSVariableStatusItemLength)
    item.title = "Hello"
    return item
}()