NSStatusBar +斯威夫特：标题显示和立即消失

Question

我想使MacOS的状态栏，但我跑得应用标题显示，并立即消失后

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

    } 

我觉得有什么不妥的参考，但不知道如何解决这个问题。

Answer 1

你的确需要一个强有力的参考状态项

var statusItem : NSStatusItem! 

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

} 

不过，我建议使用一个封闭初始化的状态项

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