ios - 提醒创建失败，错误消息为 NIL

Question

我一直致力于为我的应用程序添加待办事项功能。虽然一切看起来都不错，但我在提醒上得到了一个失败的创建，但错误值为 NIL。这是相关代码 - (我正在从 UIViewController 中提取文本和日期 - 一切都正确连接)。`

-(IBAction)createButtonPressed
{

    // Setup Variables for coverting date:
    int year;
    int month;
    int day;
    int hour;
    int minute;
    int second;
    NSDate *actualDate;
    NSDateComponents *dateComps;
    NSCalendar  *calendar;
    NSDateFormatter *dateFormatter;

    actualDate = dateValue.date;
    calendar = [[NSCalendar currentCalendar] copy];
    dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setTimeZone:[calendar timeZone]];
    [dateFormatter setDateFormat:@"yyyy"];
    year = [[dateFormatter stringFromDate:actualDate] intValue];
    [dateFormatter setDateFormat:@"MM"];
    month = [[dateFormatter stringFromDate:actualDate] intValue];
    [dateFormatter setDateFormat:@"dd"];
    day = [[dateFormatter stringFromDate:actualDate] intValue];
    [dateFormatter setDateFormat:@"HH"];
    hour = [[dateFormatter stringFromDate:actualDate] intValue];
    [dateFormatter setDateFormat:@"mm"];
    minute = [[dateFormatter stringFromDate:actualDate] intValue];
    [dateFormatter setDateFormat:@"ss"];
    second = [[dateFormatter stringFromDate:actualDate] intValue];
    dateComps = [[NSDateComponents alloc] init];
    [dateComps setTimeZone:[calendar timeZone]];
    [dateComps setDay:day];
    [dateComps setMonth:month];
    [dateComps setYear:year];
    // Create the Todo
    EKReminder *reminder = [EKReminder reminderWithEventStore:store];


    [reminder setTitle:self.actionText.text];

    [reminder setDueDateComponents:dateComps];

    EKCalendar *defaultReminderList = [store defaultCalendarForNewReminders];

    [reminder setCalendar:defaultReminderList];

    NSError *error = nil;
    BOOL success = [store saveReminder:reminder
                                commit:YES
                                 error:&error];
    if (!success) {
        NSLog(@"Error saving reminder: %@", [error localizedDescription]);
        // Popup a messaging saying the reason why you can't create the todo.

    } else {
        // Popup a message saying the to do was created
    }


}

`此代码的大部分尝试以正确的格式获取日期。我的 NSLog 显示以下内容:“错误保存提醒:(空)”

Answer 1

在 ViewDidLoad 函数中添加了以下代码

   // Add Todo Feature
    store = [[EKEventStore alloc] init];
    [store requestAccessToEntityType:EKEntityTypeReminder
                          completion:^(BOOL granted, NSError *error) {
                              // Handle not being granted permission
                          }];