IOS原生方法创建本地通知

本人不会objective-c，根据文档示例写了个IOS原生方法创建本地通知，代码可以正常运行，程序中的日志都能正常打印，但通知没有显示出来，不知道是什么原因，大神帮忙看下

    /**  
     * IOS原生方法  
     * @param {Object} contentTitle  
     * @param {Object} contentText  
     * @param {Object} smallIcon  
     */  
    function createLocalMessageForIOS(contentTitle, contentText, smallIcon){  
        console.log('ios begin.');  
        var UILocalNotification = plus.ios.importClass("UILocalNotification");  
        // 创建UILocalNotification类的实例对象  
        var localNotification = new UILocalNotification();  
        //设置调用时间  
        var NSDate = plus.ios.importClass('NSDate');  
        var myNSDate = new NSDate();  
        myNSDate.dateWithTimeIntervalSinceNow = 1; //1秒后触发  
        localNotification.fireDate = myNSDate;  
        localNotification.alertBody = contentText;  
        localNotification.applicationIconBadgeNumber = 3;  
        localNotification.alertAction = '打开应用！';  
        localNotification.alertLaunchImage = 'Default';  
        localNotification.soundName = UILocalNotification.DefaultSoundName;  
        var UIApplication = plus.ios.importClass("UIApplication");  
        var myUIApplication = new UIApplication();  
        myUIApplication.scheduleLocalNotification = localNotification;  
        //销毁对象实例  
        plus.ios.deleteObject( localNotification );  
        plus.ios.deleteObject( myUIApplication );  
        plus.ios.deleteObject( myNSDate );  
        console.log('ios end.');  
    }