UILocalNotification 的使用

来源:转载

 

@IBAction func sendNotification(sender: AnyObject) {
var userInfo = Dictionary<String,String>()
userInfo["uid"]="123456"

localNotification.alertAction = "Testing notifications on iOS8"
localNotification.alertBody = "WoWWWWWW background"
// 触发时间
localNotification.fireDate = NSDate() //立即触发
//localNotification.fireDate = NSDate().dateByAddingTimeInterval(10) //10s后触发
localNotification.applicationIconBadgeNumber = 7 //设置app 图标上的数字
localNotification.timeZone = NSTimeZone.defaultTimeZone()
//设置重复触发的间隔, 不设置的时候,只发一次. 这里的间隔只能是固定的几种日历单位,不能随意设置间隔
localNotification.repeatInterval = NSCalendarUnit.MinuteCalendarUnit
localNotification.userInfo = userInfo

UIApplication.sharedApplication().scheduleLocalNotification(localNotification) //按照 localNotification 设置的时间触发
//UIApplication.sharedApplication().presentLocalNotificationNow(localNotification) //马上触发
}

这种通知的限制是,只有当 App 的后台运行的时候或者没有运行的时候(一段时间内,应该是十分钟)才会触发. 如果要在前台运行的时候也触发,需要重写 Appdelegate 中的
func application(application: UIApplication, didReceiveLocalNotification notification: UILocalNotification)

基于 AppDelegate 的这种实现, 可以变线的实现在上面localNotification.repeatInterval 无法实现的自定义时间间隔触发的功能. 也就是在 AppDelegate 中接收到通知后自己再次发送通知

 func application(application: UIApplication, didReceiveLocalNotification notification: UILocalNotification) {

var userInfoString = ""
localNotification.alertAction = notification.alertAction
if let userInfoDic = notification.userInfo as? Dictionary<String,String> {
//这里可以获取到发送通知时设置的 userInfo
userInfoString = userInfoDic["uid"]!
}
localNotification.alertBody = notification.alertBody!+"from AppDelegate:\(userInfoString)"
localNotification.fireDate = NSDate().dateByAddingTimeInterval(10)
UIApplication.sharedApplication().scheduleLocalNotification(localNotification)
}

最后, 已经注册的通知,要手动 cancel 掉.
一种简单粗暴, cancel 掉所有的:

UIApplication.sharedApplication().cancelAllLocalNotifications()

另外如果要只 cancel 指定的通知, 可以利用 userInfo 来实现.比如下面的通过自定义的一个 Uid 来实现

func cancelLocalNotificationByUid(uid: String) {
let allLocalNotifications = UIApplication.sharedApplication().scheduledLocalNotifications as! [UILocalNotification]
for currentLocalNotification in allLocalNotifications {
if let userInfo = currentLocalNotification.userInfo as? Dictionary<String,String> {
if userInfo["uid"] == uid {
UIApplication.sharedApplication().cancelLocalNotification(currentLocalNotification)
}
}
}
}


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