在写这篇文章之前,我做了很多关于UserNotification Framework的研究,它取代了
IOS 10中的UILocalNotification.我也按照本教程学习了有关这个新功能的一切：
http://useyourloaf.com/blog/local-notifications-with-ios-10/.
今天我遇到了很多麻烦来实现这些琐碎的通知,因为它是最近的新功能,我找不到任何解决方案(特别是在目标C中)！我目前有2个不同的通知,一个警报和一个徽章更新.
警报问题
在将我的手机从IOS 10.1升级到10.2之前,我在Appdelegate上发出警报,当用户手动关闭应用程序时,该警报立即被触发：
-(void)applicationWillTerminate:(UIApplication *)application {
NSLog(@"applicationWillTerminate");
// Notification terminate
[self registerTerminateNotification];
}
// Notification Background terminate
-(void) registerTerminateNotification {
// the center
UNUserNotificationCenter * notifCenter = [UNUserNotificationCenter currentNotificationCenter];
// Content
UNMutableNotificationContent *content = [UNMutableNotificationContent new];
content.title = @"Stop";
content.body = @"Application closed";
content.sound = [UNNotificationSound defaultSound];
// Trigger
UNTimeIntervalNotificationTrigger *trigger = [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:1 repeats:NO];
// Identifier
NSString *identifier = @"LocalNotificationTerminate";
// création de la requête
UNNotificationRequest *terminateRequest = [UNNotificationRequest requestWithIdentifier:identifier content:content trigger:trigger];
// Ajout de la requête au center
[notifCenter addNotificationRequest:terminateRequest withCompletionHandler:^(NSError * _Nullable error) {
if (error != nil) {
NSLog(@"Error %@: %@",identifier,error);
}
}];
}
在IOS 10.2之前它运行得很好,当我手动关闭应用程序时,会出现警报.但是自从我更新到IOS 10.2后,没有任何理由没有任何显示,我没有改变任何东西,我看不出有什么遗漏……
徽章问题
我也试过(这次只在IOS 10.2中)在我的应用程序图标上实现了一个很好的标记,直到我试图删除它.这是执行它的功能：
+(void) incrementBadgeIcon {
// only increment if application is in background
if ([[UIApplication sharedApplication] applicationState] == UIApplicationStateBackground){
NSLog(@"increment badge");
// notif center
UNUserNotificationCenter *notifCenter = [UNUserNotificationCenter currentNotificationCenter];
// Content
UNMutableNotificationContent *content = [UNMutableNotificationContent new];
content.badge = [NSNumber numberWithInt:1];
// Trigger
UNTimeIntervalNotificationTrigger *trigger = [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:1 repeats:NO];
// Identifier
NSString *identifier = @"LocalNotificationIncrementBadge";
// request
UNNotificationRequest *incrementBadgeRequest = [UNNotificationRequest requestWithIdentifier:identifier content:content trigger:trigger];
// Ajout de la requête au center
[notifCenter addNotificationRequest:incrementBadgeRequest withCompletionHandler:^(NSError * _Nullable error) {
if (error != nil) {
NSLog(@"Error %@: %@",error);
}
}];
}
}
现在它没有增加徽章编号,因为它的名称应该建议,但它只是将徽章编号设置为1.文档说如果你将content.badge设置为0,它会删除它,但这不起作用.我尝试使用其他数字,当我手动将其更改为“2”,“3”等时……它会发生变化,但如果我将其设置为0,则无效.
另外,在我之前链接的教程中,它提到了几个函数作为getPendingNotificationRequests：completionHandler：和getDeliveredNotificationRequests：completionHandler：.我注意到,当我在调用incrementBadgeIcon之后立即调用这些函数时,如果content.badge设置为’1′,’2’等……它将出现在待处理通知列表中.但是,当我将其设置为0时,它不会出现在任何地方.我没有收到错误,Xcode中没有任何警告,我的应用程序徽章仍然存在.
有谁知道如何修复这两个警报？
预先感谢
PS：我也尝试使用removeAllPendingNotificationRequests和removeAllDeliveredNotifications两者都没有成功.
解决方法
关于警报：
当您的本地通知触发时,您的应用可能仍处于前台,因此您需要实施委托方法,以便通知执行任何操作.例如,在您的委托中定义此方法将允许通知显示警报,发出声音并更新徽章：
func userNotificationCenter(_ center: UNUserNotificationCenter,willPresent notification: UNNotification,withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
completionHandler([.alert,.badge,.sound])
}
关于徽章：
我观察到创建一个UNMutableNotificationContent对象并仅指定徽章值(作为NSNumber对象)适用于除0之外的所有徽章值(即,您无法以这种方式清除徽章).我没有找到任何关于为什么0的行为与任何其他值不同的文档,特别是因为.badge属性被定义为NSNumber？所以框架应该能够区分nil(无变化)和0(清除徽章).
我已针对此提交了radar.
作为解决方法,我发现在UNMutableNotificationContent对象上设置title属性,徽章值为NSNumber(值：0).如果缺少title属性,则不会触发.
添加title属性仍然不会向用户显示警告(更新：在iOS 11中不再是这种情况！),因此这是一种无需调用UIApplication对象即可将徽章值静默更新为0的方法(通过UIApplication.shared.applicationIconBadgeNumber = 0).
这是我的示例项目中的全部代码; ViewController代码中有一个MARK,显示插入title属性的位置可以解决问题：
//
// AppDelegate.swift
// userNotificationZeroBadgeTest
//
// Created by Jeff Vautin on 1/3/17.
// Copyright © 2017 Jeff Vautin. All rights reserved.
//
import UIKit
import UserNotifications
@UIApplicationMain
class AppDelegate: UIResponder,UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication,didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
UNUserNotificationCenter.current().requestAuthorization(options: [.badge,.alert,.sound]) { (success,error) -> Void in
print("Badge auth: \(success)")
}
// For handling Foreground notifications,this needs to be assigned before finishing this method
let vc = window?.rootViewController as! ViewController
let center = UNUserNotificationCenter.current()
center.delegate = vc
return true
}
}
//
// ViewController.swift
// userNotificationZeroBadgeTest
//
// Created by Jeff Vautin on 1/3/17.
// Copyright © 2017 Jeff Vautin. All rights reserved.
//
import UIKit
import UserNotifications
class ViewController: UIViewController,UNUserNotificationCenterDelegate {
@IBAction func start(_ sender: Any) {
// Reset badge directly (this always works)
UIApplication.shared.applicationIconBadgeNumber = 0
let center = UNUserNotificationCenter.current()
// Schedule badge value of 1 in 5 seconds
let notificationBadgeOneContent = UNMutableNotificationContent()
notificationBadgeOneContent.badge = NSNumber(value: 1)
let notificationBadgeOneTrigger = UNTimeIntervalNotificationTrigger.init(timeInterval: 1*5,repeats: false)
let notificationBadgeOneRequest = UNNotificationRequest.init(identifier: "1",content: notificationBadgeOneContent,trigger: notificationBadgeOneTrigger)
center.add(notificationBadgeOneRequest)
// Schedule badge value of 2 in 10 seconds
let notificationBadgeTwoContent = UNMutableNotificationContent()
notificationBadgeTwoContent.badge = NSNumber(value: 2)
let notificationBadgeTwoTrigger = UNTimeIntervalNotificationTrigger.init(timeInterval: 2*5,repeats: false)
let notificationBadgeTwoRequest = UNNotificationRequest.init(identifier: "2",content: notificationBadgeTwoContent,trigger: notificationBadgeTwoTrigger)
center.add(notificationBadgeTwoRequest)
// Schedule badge value of 3 in 15 seconds
let notificationBadgeThreeContent = UNMutableNotificationContent()
notificationBadgeThreeContent.badge = NSNumber(value: 3)
let notificationBadgeThreeTrigger = UNTimeIntervalNotificationTrigger.init(timeInterval: 3*5,repeats: false)
let notificationBadgeThreeRequest = UNNotificationRequest.init(identifier: "3",content: notificationBadgeThreeContent,trigger: notificationBadgeThreeTrigger)
center.add(notificationBadgeThreeRequest)
// Schedule badge value of 4 in 20 seconds
let notificationBadgeFourContent = UNMutableNotificationContent()
notificationBadgeFourContent.badge = NSNumber(value: 4)
let notificationBadgeFourTrigger = UNTimeIntervalNotificationTrigger.init(timeInterval: 4*5,repeats: false)
let notificationBadgeFourRequest = UNNotificationRequest.init(identifier: "4",content: notificationBadgeFourContent,trigger: notificationBadgeFourTrigger)
center.add(notificationBadgeFourRequest)
// Schedule badge value of 0 in 25 seconds
let notificationBadgeZeroContent = UNMutableNotificationContent()
// MARK: Uncommenting this line setting title property will cause notification to fire properly.
//notificationBadgeZeroContent.title = "Zero!"
notificationBadgeZeroContent.badge = NSNumber(value: 0)
let notificationBadgeZeroTrigger = UNTimeIntervalNotificationTrigger.init(timeInterval: 5*5,repeats: false)
let notificationBadgeZeroRequest = UNNotificationRequest.init(identifier: "0",content: notificationBadgeZeroContent,trigger: notificationBadgeZeroTrigger)
center.add(notificationBadgeZeroRequest)
}
@IBAction func listNotifications(_ sender: Any) {
let center = UNUserNotificationCenter.current()
center.getDeliveredNotifications() { (notificationArray) -> Void in
print("Delivered notifications: \(notificationArray)")
}
center.getPendingNotificationRequests() { (notificationArray) -> Void in
print("Pending notifications: \(notificationArray)")
}
}
// MARK: UNUserNotificationCenterDelegate
func userNotificationCenter(_ center: UNUserNotificationCenter,withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
print("Received notification: \(notification)")
completionHandler([.alert,.sound])
}
}
