显示NSUserNotification的横幅，而app位于最前端

Question

我想显示用户通知，而应用程序是最正面的。我在下面找到了代码，但我不知道如何使用委托:它似乎只是返回一个布尔值。

class MyNotificationDelegate: NSObject, NSApplicationDelegate, NSUserNotificationCenterDelegate {

func applicationDidFinishLaunching(aNotification: NSNotification) {
    NSUserNotificationCenter.defaultUserNotificationCenter().delegate = self
}

func userNotificationCenter(center: NSUserNotificationCenter, shouldPresentNotification notification: NSUserNotification) -> Bool {
    return true
} }

我试过一些句子，比如：

var delegate : MyNotificationDelegate = MyNotificationDelegate()
var notification:NSUserNotification = NSUserNotification()
var notificationcenter:NSUserNotificationCenter = NSUserNotificationCenter.defaultUserNotificationCenter()

delegate.userNotificationCenter(notificationcenter, shouldPresentNotification: notification)

但它不会展示横幅。我知道，对于NSUserNotificationCenter，deliverNotification:方法是显示横幅的方法。但我不确定NSUserNotificationCenterDelegate协议。

如何总是显示通知横幅？

Answer 1

您的通知中心委托和委托方法应该在AppDelegate中实现，然后才能工作。如果您在任何其他类中实现，它将不会以横幅形式出现，尽管它在通知面板中无声地出现。

我试着做了以下工作：

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate, NSUserNotificationCenterDelegate {



    func applicationDidFinishLaunching(aNotification: NSNotification) {
        let notification: MyNotificationDelegate = MyNotificationDelegate()
        NSUserNotificationCenter.defaultUserNotificationCenter().delegate = self;
        notification.setNotification("Hi", message: "How are you?")
    }

    func userNotificationCenter(center: NSUserNotificationCenter, shouldPresentNotification notification: NSUserNotification) -> Bool {
        return true
    }

    func applicationWillTerminate(aNotification: NSNotification) {
        // Insert code here to tear down your application
    }


}

class MyNotificationDelegate: NSObject {

    func setNotification(title: String, message: String)
    {
        let notification: NSUserNotification = NSUserNotification()
        notification.title = title
        notification.informativeText = message
        NSUserNotificationCenter.defaultUserNotificationCenter().deliverNotification(notification)
    }
}