我想在应用程序显示在最前面时显示用户通知。 我找到了下面的代码，但我不确定如何使用委托(delegate):它似乎只返回一个 bool 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，例如:
var delegate : MyNotificationDelegate = MyNotificationDelegate()
var notification:NSUserNotification = NSUserNotification()
var notificationcenter:NSUserNotificationCenter = NSUserNotificationCenter.defaultUserNotificationCenter()
delegate.userNotificationCenter(notificationcenter, shouldPresentNotification: notification)
但它不会显示横幅。
我知道对于 NSUserNotificationCenter，deliverNotification: 方法是显示横幅的方式。但我不确定 NSUserNotificationCenterDelegate 协议(protocol)。
如何始终显示通知横幅？
最佳答案
您的通知中心委托(delegate)和委托(delegate)方法应该在 AppDelegate 中实现，然后它才能工作。如果您在任何其他类中实现，它不会显示为横幅，尽管它会静静地出现在通知面板中。
我试过如下，它的工作:
@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)
}
}
关于macos - 当应用程序位于最前面时显示 NSUserNotification 的横幅，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31869040/