Question

我的代码抛出以下异常：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[0]'

在线：

[[UIApplication sharedApplication] cancelLocalNotification:appDelegate.dailyNotificationMonday];

在代码块中：

if ([[defaults objectForKey:@"dailyReminder"] isEqualToString:@"1"]){
        //Schedule Notifications for each checked day
        if ([[defaults objectForKey:@"dailyReminderMonday"] isEqualToString:@"1"])
        {
            //Set up the local notification
            appDelegate.dailyNotificationMonday = [[UILocalNotification alloc] init];
            if(appDelegate.dailyNotificationMonday){
                //Set fire date to alert time
                appDelegate.dailyNotificationMonday.fireDate = mondayFireTime;
                //Set Alert body
                appDelegate.dailyNotificationMonday.alertBody = textField.text;
                //Set time zone to default
                appDelegate.dailyNotificationMonday.timeZone = [NSTimeZone defaultTimeZone];
                //Repeat the notification everyday (fires at same time
                //as initial notification)
                appDelegate.dailyNotificationMonday.repeatInterval = NSWeekCalendarUnit;

                // schedule notification
                UIApplication *app = [UIApplication sharedApplication];
                [app scheduleLocalNotification:appDelegate.dailyNotificationMonday];

                NSLog(@"Monday Fire Date: %@", appDelegate.dailyNotificationMonday.fireDate);
            }
        }
        else {
           [[UIApplication sharedApplication] cancelLocalNotification:appDelegate.dailyNotificationMonday]; 
        }

        if ([[defaults objectForKey:@"dailyReminderTuesday"] isEqualToString:@"1"])
        {
            //Set up the local notification
            appDelegate.dailyNotificationTuesday = [[UILocalNotification alloc] init];
            if(appDelegate.dailyNotificationTuesday){
                //Set fire date to alert time
                appDelegate.dailyNotificationTuesday.fireDate = tuesdayFireTime;
                //Set Alert body
                appDelegate.dailyNotificationTuesday.alertBody = textField.text;
                //Set time zone to default
                appDelegate.dailyNotificationTuesday.timeZone = [NSTimeZone defaultTimeZone];
                //Repeat the notification everyday (fires at same time
                //as initial notification)
                appDelegate.dailyNotificationTuesday.repeatInterval = NSWeekCalendarUnit;

                // schedule notification
                UIApplication *app = [UIApplication sharedApplication];
                [app scheduleLocalNotification:appDelegate.dailyNotificationTuesday];

                NSLog(@"Tuesday Fire Date: %@", appDelegate.dailyNotificationTuesday.fireDate);
            }
        }
        else {
            [[UIApplication sharedApplication] cancelLocalNotification:appDelegate.dailyNotificationTuesday]; 
        }

        if ([[defaults objectForKey:@"dailyReminderWednesday"] isEqualToString:@"1"])
        {
            //Set up the local notification
            appDelegate.dailyNotificationWednesday = [[UILocalNotification alloc] init];
            if(appDelegate.dailyNotificationWednesday){
                //Set fire date to alert time
                appDelegate.dailyNotificationWednesday.fireDate = wednesdayFireTime;
                //Set Alert body
                appDelegate.dailyNotificationWednesday.alertBody = textField.text;
                //Set time zone to default
                appDelegate.dailyNotificationWednesday.timeZone = [NSTimeZone defaultTimeZone];
                //Repeat the notification everyday (fires at same time
                //as initial notification)
                appDelegate.dailyNotificationWednesday.repeatInterval = NSWeekCalendarUnit;

                // schedule notification
                UIApplication *app = [UIApplication sharedApplication];
                [app scheduleLocalNotification:appDelegate.dailyNotificationWednesday];

                NSLog(@"Wednesday Fire Date: %@", appDelegate.dailyNotificationWednesday.fireDate);
            }
        }
        else {
            [[UIApplication sharedApplication] cancelLocalNotification:appDelegate.dailyNotificationWednesday]; 
        }

        if ([[defaults objectForKey:@"dailyReminderThursday"] isEqualToString:@"1"])
        {
            //Set up the local notification
            appDelegate.dailyNotificationThursday = [[UILocalNotification alloc] init];
            if(appDelegate.dailyNotificationThursday){
                //Set fire date to alert time
                appDelegate.dailyNotificationThursday.fireDate = thursdayFireTime;
                //Set Alert body
                appDelegate.dailyNotificationThursday.alertBody = textField.text;
                //Set time zone to default
                appDelegate.dailyNotificationThursday.timeZone = [NSTimeZone defaultTimeZone];
                //Repeat the notification everyday (fires at same time
                //as initial notification)
                appDelegate.dailyNotificationThursday.repeatInterval = NSWeekCalendarUnit;

                // schedule notification
                UIApplication *app = [UIApplication sharedApplication];
                [app scheduleLocalNotification:appDelegate.dailyNotificationThursday];

                NSLog(@"Thursday Fire Date: %@", appDelegate.dailyNotificationThursday.fireDate);
            }
        }
        else {
            [[UIApplication sharedApplication] cancelLocalNotification:appDelegate.dailyNotificationThursday]; 
        }

        if ([[defaults objectForKey:@"dailyReminderFriday"] isEqualToString:@"1"])
        {
            //Set up the local notification
            appDelegate.dailyNotificationFriday = [[UILocalNotification alloc] init];
            if(appDelegate.dailyNotificationFriday){
                //Set fire date to alert time
                appDelegate.dailyNotificationFriday.fireDate = fridayFireTime;
                //Set Alert body
                appDelegate.dailyNotificationFriday.alertBody = textField.text;
                //Set time zone to default
                appDelegate.dailyNotificationFriday.timeZone = [NSTimeZone defaultTimeZone];
                //Repeat the notification everyday (fires at same time
                //as initial notification)
                appDelegate.dailyNotificationFriday.repeatInterval = NSWeekCalendarUnit;

                // schedule notification
                UIApplication *app = [UIApplication sharedApplication];
                [app scheduleLocalNotification:appDelegate.dailyNotificationFriday];

                NSLog(@"Friday Fire Date: %@", appDelegate.dailyNotificationFriday.fireDate);
            }
        }
        else {
            [[UIApplication sharedApplication] cancelLocalNotification:appDelegate.dailyNotificationFriday]; 
        }

        if ([[defaults objectForKey:@"dailyReminderSaturday"] isEqualToString:@"1"])
        {
            //Set up the local notification
            appDelegate.dailyNotificationSaturday = [[UILocalNotification alloc] init];
            if(appDelegate.dailyNotificationSaturday){
                //Set fire date to alert time
                appDelegate.dailyNotificationSaturday.fireDate = saturdayFireTime;
                //Set Alert body
                appDelegate.dailyNotificationSaturday.alertBody = textField.text;
                //Set time zone to default
                appDelegate.dailyNotificationSaturday.timeZone = [NSTimeZone defaultTimeZone];
                //Repeat the notification everyday (fires at same time
                //as initial notification)
                appDelegate.dailyNotificationSaturday.repeatInterval = NSWeekCalendarUnit;

                // schedule notification
                UIApplication *app = [UIApplication sharedApplication];
                [app scheduleLocalNotification:appDelegate.dailyNotificationSaturday];

                NSLog(@"Saturday Fire Date: %@", appDelegate.dailyNotificationSaturday.fireDate);
            }
        }
        else {
            [[UIApplication sharedApplication] cancelLocalNotification:appDelegate.dailyNotificationSaturday]; 
        }

        if ([[defaults objectForKey:@"dailyReminderSunday"] isEqualToString:@"1"])
        {
            //Set up the local notification
            appDelegate.dailyNotificationSunday = [[UILocalNotification alloc] init];
            if(appDelegate.dailyNotificationSunday){
                //Set fire date to alert time
                appDelegate.dailyNotificationSunday.fireDate = sundayFireTime;
                //Set Alert body
                appDelegate.dailyNotificationSunday.alertBody = textField.text;
                //Set time zone to default
                appDelegate.dailyNotificationSunday.timeZone = [NSTimeZone defaultTimeZone];
                //Repeat the notification everyday (fires at same time
                //as initial notification)
                appDelegate.dailyNotificationSunday.repeatInterval = NSWeekCalendarUnit;

                // schedule notification
                UIApplication *app = [UIApplication sharedApplication];
                [app scheduleLocalNotification:appDelegate.dailyNotificationSunday];

                NSLog(@"Sunday Fire Date: %@", appDelegate.dailyNotificationSunday.fireDate);
            }
        }
        else {
            [[UIApplication sharedApplication] cancelLocalNotification:appDelegate.dailyNotificationSunday]; 
        }


    }
    else {
        //Remove all daily notifications
        [[UIApplication sharedApplication] cancelLocalNotification:appDelegate.dailyNotificationMonday];
        [[UIApplication sharedApplication] cancelLocalNotification:appDelegate.dailyNotificationTuesday];
        [[UIApplication sharedApplication] cancelLocalNotification:appDelegate.dailyNotificationWednesday];
        [[UIApplication sharedApplication] cancelLocalNotification:appDelegate.dailyNotificationThursday];
        [[UIApplication sharedApplication] cancelLocalNotification:appDelegate.dailyNotificationFriday];
        [[UIApplication sharedApplication] cancelLocalNotification:appDelegate.dailyNotificationSaturday];
        [[UIApplication sharedApplication] cancelLocalNotification:appDelegate.dailyNotificationSunday];
    }

我的AppDelegate中也有这段代码：

//Initialze daily notifications
        dailyNotificationMonday = [[UILocalNotification alloc] init];
        dailyNotificationTuesday = [[UILocalNotification alloc] init];
        dailyNotificationWednesday = [[UILocalNotification alloc] init];
        dailyNotificationThursday = [[UILocalNotification alloc] init];
        dailyNotificationFriday = [[UILocalNotification alloc] init];
        dailyNotificationSaturday = [[UILocalNotification alloc] init];
        dailyNotificationSunday = [[UILocalNotification alloc] init];

        //Initialize submition notifications
        submitNotification = [[UILocalNotification alloc] init];
        badgerNotification = [[UILocalNotification alloc] init];

        //Initialize Automatic backup notification
        automaticBackupNotification  = [[UILocalNotification alloc] init];

只在首次启动应用程序时调用一次。

我根本不习惯使用本地通知，但我不明白这里发生了什么，在我看来，我正在尝试取消不存在的通知？

非常感谢任何建议。

谢谢，

Tysin

Answer 1

看起来appDelegate.dailyNotificationMonday是nil。这似乎不是传递给-cancelLocalNotification:的有效值。

你试过了吗？

if (appDelegate.dailyNotificationMonday)
    [[UIApplication sharedApplication] cancelLocalNotification:appDelegate.dailyNotificationMonday];

希望有所帮助。

Answer 2

appDelegate.dailyNotificationMonday为零，因为您只在此if块中安排它：

if ([[defaults objectForKey:@"dailyReminderMonday"] isEqualToString:@"1"])

如果这不是真的并且在else块中调用了cancelLocalNotification，那么你实际上是在告诉应用程序取消尚未安排的通知。我实际上认为你甚至不需要其他阻止，你试着摆脱它吗？

尝试取消本地通知时，应用程序抛出“NSInvalidArgumentException”

2 个答案: