NSStatusBar +斯威夫特：標題顯示和立即消失

Question

我想使MacOS的狀態欄，但我跑得應用標題顯示，並立即消失後

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

    } 

我覺得有什麼不妥的參考，但不知道如何解決這個問題。

Answer 1

你的確需要一個強有力的參考狀態項

var statusItem : NSStatusItem! 

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

} 

不過，我建議使用一個封閉初始化的狀態項

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