ios - 如何覆盖 NSUserDefaults？

Question

我有 uilocalnotification ，我使用 NSDateComponents 为每个通知设置不同的时间，具体取决于项目应该得到通知的次数。

     -(NSArray *)fireDatesForFrequency:(int)freq
    {

        if (freq == 1)
        {

            [components setHour:8];
            [components setMinute:00];

            NSDate *date = [gregorian dateFromComponents:components];

            NSArray *dates =[[NSArray alloc]initWithObjects:date, nil];

            return dates;
        }

        if (freq == 2) {

            [components setHour:8];
            [components setMinute:00];


            NSDate *date1 = [gregorian dateFromComponents:components];

            [components setHour:20];
            [components setMinute:00];

            NSDate *date2 = [gregorian dateFromComponents:components];

            NSArray *dates =[[NSArray alloc]initWithObjects:date1,date2, nil];

            return dates;
        }

        if (freq == 3)
        {

            [components setHour:8];
            [components setMinute:00];

            NSDate *date1 = [gregorian dateFromComponents:components];

            [components setHour:12];
            [components setMinute:00];

            NSDate *date2 = [gregorian dateFromComponents:components];

            [components setHour:16];
            [components setMinute:00];

            NSDate *date3 = [gregorian dateFromComponents:components];

            NSArray *dates =[[NSArray alloc]initWithObjects:date1,date2,date3, nil];

            return dates;

        }


        if (freq == 4)
        {

            [components setHour:8];
            [components setMinute:00];

            NSDate *date1 = [gregorian dateFromComponents:components];

            [components setHour:12];
            [components setMinute:00];

            NSDate *date2 = [gregorian dateFromComponents:components];

            [components setHour:16];
            [components setMinute:00];

            NSDate *date3 = [gregorian dateFromComponents:components];

            [components setHour:20];
            [components setMinute:00];

            NSDate *date4 = [gregorian dateFromComponents:components];

            NSArray *dates =[[NSArray alloc]initWithObjects:date1,date2,date3,date4, nil];

            return dates;

        }

          return nil;

    }

现在我想将这些时间存储在 NSUserDefaults 中，这样如果用户想根据他的需要更改时间，我想将这些时间存储在 NSUserdefaults 中。我想用 userupdatednsuserdefaults 替换默认的 NSuserdefaults ..datepicker 有分段控制，所以当用户从 datepicker 选择时间时，时间应该更新为默认的 nsuserdefaults 。所以如果用户选择第一个分段控制项，则该值应该存储在

- (IBAction)didChangeSegmentControl:(UISegmentedControl *)control
{
    NSInteger index = [notificationSessionTab selectedSegmentIndex];

    if (index == 0)
    {
        [userTimePicker reloadInputViews];
        [components setHour:7];;
        [components setMinute:00];

        NSDate *date1 = [gregorian dateFromComponents:components];

        [components setHour:9];
        [components setMinute:00];

        NSDate *date2 = [gregorian dateFromComponents:components];

        //NSArray *dates =[[NSArray alloc]initWithObjects:date1,date2,date3,date4, nil];
        [userTimePicker setDatePickerMode:UIDatePickerModeTime];

        [userTimePicker setMinimumDate:date1];
        [userTimePicker setMaximumDate:date2];
        NSDate *selectedTime =[userTimePicker date];
    }

    if (index == 1)
    {
        [userTimePicker reloadInputViews];

        [components setHour:11];
        [components setMinute:00];

        NSDate *date1 = [gregorian dateFromComponents:components];

        [components setHour:13];
        [components setMinute:00];

        NSDate *date2 = [gregorian dateFromComponents:components];

        //NSArray *dates =[[NSArray alloc]initWithObjects:date1,date2,date3,date4, nil];
        [userTimePicker setDatePickerMode:UIDatePickerModeTime];

        [userTimePicker setMinimumDate:date1];
        [userTimePicker setMaximumDate:date2];
        NSDate *selectedTime =[userTimePicker date];
    }

    if (index == 2)
    {
        [userTimePicker reloadInputViews];

        [components setHour:15];
        [components setMinute:00];

        NSDate *date1 = [gregorian dateFromComponents:components];

        [components setHour:18];
        [components setMinute:00];

        NSDate *date2 = [gregorian dateFromComponents:components];

        //NSArray *dates =[[NSArray alloc]initWithObjects:date1,date2,date3,date4, nil];
        [userTimePicker setDatePickerMode:UIDatePickerModeTime];

        [userTimePicker setMinimumDate:date1];
        [userTimePicker setMaximumDate:date2];
        NSDate *selectedTime =[userTimePicker date];
    }

    if (index == 3)
    {
        [userTimePicker reloadInputViews];

        [components setHour:19];
        [components setMinute:00];

        NSDate *date1 = [gregorian dateFromComponents:components];

        [components setHour:21];
        [components setMinute:00];

        NSDate *date2 = [gregorian dateFromComponents:components];

        //NSArray *dates =[[NSArray alloc]initWithObjects:date1,date2,date3,date4, nil];
        [userTimePicker setDatePickerMode:UIDatePickerModeTime];

        [userTimePicker setMinimumDate:date1];
        [userTimePicker setMaximumDate:date2];
        NSDate *selectedTime =[userTimePicker date];
    }

}

Answer 1

You can store NSDate in NSUserDefaults without it's overriding. This question discussed more detailed here What's the optimum way of storing an NSDate in NSUserDefaults?.

You also can store in NSUserDefault array of dates. So I don't think that overriding standard UserDefaults is good idea, instead you can create Category extension to achieve more abstraction.