iOS 闹钟的实现

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发布于 2019-10-22 14:14:55

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发布于 2019-10-22 14:14:55

文章被收录于专栏：码客码客

概述

iOS的机制是一旦程序处于后台，那么程序就处于暂停状态，这也是iOS系统后台开很多应用依旧流畅的原因，因为这个机制，所以类似闹钟这样的应用就不能用定时器实现那么我们要怎样实现定时提醒的功能呢

iOS的通知是系统级的，也就是说就算我们的软件关闭了，他依然能通知我们，但是他只能做到定时通知，所以没办法实现定时任务，所以基本上iOS上实现（不能全自动）定时任务的流程都是

注册通知 –> 添加通知 –> 通知栏显示通知 –> 点击通知进入软件 –> 处理通知

下面就用实际代码实现这个功能

示例

注册通知

只有APP注册了通知，那么添加的本地通知才能被接受到

//注册通知
func registerNofitication(){
    if #available(iOS 8.0, *) {
        let types:UIUserNotificationType = [UIUserNotificationType.Alert, UIUserNotificationType.Badge,UIUserNotificationType.Sound];
        let acceptAction = UIMutableUserNotificationAction()
        acceptAction.identifier = "ACCEPT_IDENTIFIER";
        acceptAction.title = "Accept";
        
        acceptAction.activationMode = UIUserNotificationActivationMode.Foreground;
        acceptAction.destructive = false;
        acceptAction.authenticationRequired = false;
        
        //Categories
        let inviteCategory = UIMutableUserNotificationCategory();
        
        inviteCategory.identifier = "INVITE_CATEGORY";
        
        inviteCategory.setActions([acceptAction], forContext: UIUserNotificationActionContext.Default);
        inviteCategory.setActions([acceptAction], forContext: UIUserNotificationActionContext.Minimal);
        
        let categories = NSSet(object: inviteCategory);
        
        let mySettings = UIUserNotificationSettings(forTypes: types, categories: categories as? Set<UIUserNotificationCategory>);
        UIApplication.sharedApplication().registerUserNotificationSettings(mySettings);
        UIApplication.sharedApplication().registerForRemoteNotifications();
    } else {
        UIApplication.sharedApplication().registerForRemoteNotificationTypes([UIRemoteNotificationType.Alert,UIRemoteNotificationType.Badge,UIRemoteNotificationType.Sound]);
    };
}

添加本地通知

/**
 添加通知
 
 - parameter date:本地通知的时间
 - parameter attendanceType:签到或签退
 */
func addNotifation(date:NSDate,attendanceType:String){
    let notification = UILocalNotification();
    notification.fireDate = date;
    notification.repeatInterval = NSCalendarUnit.Day;
    notification.timeZone = NSTimeZone.defaultTimeZone();
    //notification.applicationIconBadgeNumber=1; //应用的红色数字
    notification.soundName = UILocalNotificationDefaultSoundName;
    notification.alertBody = "考勤君友情提示：不签到要扣工资的哟！";//提示信息
    notification.alertAction = "打开";  //提示框按钮
    var userInfo:[String:String] = [:];
    userInfo["type"] = "考勤";
    userInfo["attendanceType"] = attendanceType;
    notification.userInfo = userInfo;
    
    //添加通知
    UIApplication.sharedApplication().scheduleLocalNotification(notification);
}

代码中通知的重复周期为NSCalendarUnit.Day，所以每天都会通知，要想一天通知4次的话，只能注册四个通知，并设置重复周期为NSCalendarUnit.Day

删除原有的通知

/**
 删除原有的考勤通知
 */
func delLocalNotification(){
    let application = UIApplication.sharedApplication();
    let localNotifications = application.scheduledLocalNotifications;
    
    guard localNotifications != nil else{
        return;
    }
    
    guard localNotifications!.count>0 else {
        return;
    }
    
    for localNotification in localNotifications!{
        
        guard let userInfo = localNotification.userInfo else{
            continue;
        }
        
        guard let type = userInfo["type"] else {
            continue;
        }
        
        if((type as! String) == "考勤"){
            application.cancelLocalNotification(localNotification);
        }
        
    }
}

清空本应用所有消息

/**
 清空所有本应用的消息（不再通知）
 */
func clearAllNotifation(){
    let application = UIApplication.sharedApplication();
    application.applicationIconBadgeNumber = 0;
    application.cancelAllLocalNotifications();
}

清空本应用通知栏的所有消息

/**
 清空所有本应用的通知栏消息（会继续通知）
 */
func clearAllNotifation(){
    let application = UIApplication.sharedApplication();
    application.applicationIconBadgeNumber = 0;
}

接受本地推送的代理方法

该方法会在两种情况下运行

app处于激活状态接受本地通知时调用
app处于关闭或未激活状态，接受本地通知时不调用，点击消息后进入app后调用

代码

func application(application: UIApplication, didReceiveLocalNotification notification: UILocalNotification) {
    print("接受本地推送")
    
    guard let userInfo = notification.userInfo else{
        return;
    }
    
    guard let type = userInfo["type"] else{
        return;
    }
    
    guard let attendanceType = userInfo["attendanceType"] else{
        return;
    }
    
    guard (type as! String) == "考勤" else {
        return;
    }

    if((attendanceType as! String) == "签到"){
        //签到的方法
    }else if((attendanceType as! String) == "签退"){
        //签退的方法
    }
}

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原始发表：2016-03-01，如有侵权请联系 cloudcommunity@tencent.com 删除

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