在项目中增加日历提醒功能，和删除这个日历，某个时间段的删除

#import "ViewController.h"
#import <EventKit/EventKit.h>
#import <EventKit/EKEventStore.h>
#import <EventKit/EKAlarm.h>
#import "EventCalendar.h"
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
  EKAuthorizationStatus  statues = [EKEventStore authorizationStatusForEntityType:EKEntityTypeEvent];
    //添加日历的提醒
  EKEventStore * eventStore =  [[EKEventStore alloc]init];
    [eventStore requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError * _Nullable error) {
        if (granted) {
//            同意
        }else{
//            不同意
        }
        
    }];

    
    //创建事件
    EKEvent *event  = [EKEvent eventWithEventStore:eventStore];
    
    //给事件添加标题
    event.title  = @"这里是日历事件的标题";
    //设置地点
    event.location = @"这里可以随便写地点";
    //创建测试时间，这里可以改为任意时间
    NSDate *date = [NSDate date];
    //开始时间(必须传)
    event.startDate = [date dateByAddingTimeInterval:1 * 2];
    //结束时间(必须传)
    event.endDate = [date dateByAddingTimeInterval:60 * 5 * 24];
    //全天的事件
    event.allDay = YES;
    //添加提醒
    //第一次提醒 设置事件开始之前1分钟提醒
    [event addAlarm:[EKAlarm alarmWithRelativeOffset:60.0f *60*10+ 60 *6]];
    //第二次提醒 设置事件开始之前2分钟提醒
    //                [event addAlarm:[EKAlarm alarmWithRelativeOffset:60.0f * -2.0f]];
    //第N次提醒 设置事件提醒
    //                [event addAlarm:[EKAlarm alarmWithRelativeOffset:秒]];
    //事件类容备注
    NSString * str = @"这里写备注就行了";
    event.notes = [NSString stringWithFormat:@"%@",str];
    //添加事件到日历中
    [event setCalendar:[eventStore defaultCalendarForNewEvents]];

    NSError *err;
    [eventStore saveEvent:event span:EKSpanThisEvent error:&err];
    //保存事件id，方便查询和删除
    [[NSUserDefaults standardUserDefaults]setObject:event.eventIdentifier forKey:@"eventId"];
    
//    添加提醒事项中的提醒
    [self addReminderNotify:[NSDate dateWithTimeIntervalSinceNow:0] title:@"提醒"];
}

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    EKEventStore * eventStore =  [[EKEventStore alloc]init];

    //获取eventId
    NSString *eventId=[[NSUserDefaults standardUserDefaults]objectForKey:@"eventId"];
    if (eventId) {
        //根据eventId获取事件
        EKEvent *ekEvent=[eventStore  eventWithIdentifier:eventId];
        NSError *err;
        //删除事件 这次事件
        [eventStore removeEvent:ekEvent span:EKSpanThisEvent error:&err];
    }

   
    
}

-(void)getDateEvent{
    
        EKEventStore * eventStore =  [[EKEventStore alloc]init];

    
      NSDate *startDate = [NSDate dateWithTimeIntervalSinceNow:-3600 *24 * 90];//事件段，开始时间
    
      NSDate *endDate = [NSDate dateWithTimeIntervalSinceNow:3600 *24 * 90];//事件段，结束时间
    
      NSPredicate *predicate = [eventStore predicateForEventsWithStartDate:startDate endDate:endDate calendars:nil];
    
      NSArray *events = [eventStore eventsMatchingPredicate:predicate]; // 数组里面就是时间短中的ekevent事件数组
    
        
    NSError *err;

        for (EKEvent *event in events) {
        
               NSLog(@"\nidentify:%@",event.eventIdentifier);
        
        [eventStore removeEvent:event span:EKSpanThisEvent error:&err];

           }
    
    
}



@end

-(void)addReminderNotify:(NSDate *)date title:(NSString *)title
{
    EKEventStore *eventDB = [[EKEventStore alloc] init];
    //申请提醒权限
    [eventDB requestAccessToEntityType:EKEntityTypeReminder completion:^(BOOL granted, NSError * _Nullable error) {
        if (granted) {
            //创建一个提醒功能
            EKReminder *reminder = [EKReminder reminderWithEventStore:eventDB];
            //标题
            reminder.title = title;
            //添加日历
            [reminder setCalendar:[eventDB defaultCalendarForNewReminders]];
            NSCalendar *cal = [NSCalendar currentCalendar];
            [cal setTimeZone:[NSTimeZone systemTimeZone]];
            NSInteger flags = NSCalendarUnitYear | NSCalendarUnitMonth |
            NSCalendarUnitDay |NSCalendarUnitHour | NSCalendarUnitMinute |
            NSCalendarUnitSecond;
            NSDateComponents* dateComp = [cal components:flags fromDate:date];
            dateComp.timeZone = [NSTimeZone systemTimeZone];
            reminder.startDateComponents = dateComp; //开始时间
            reminder.dueDateComponents = dateComp; //到期时间
            reminder.priority = 1; //优先级
            EKAlarm *alarm = [EKAlarm alarmWithAbsoluteDate:date]; //添加一个车闹钟
            [reminder addAlarm:alarm];
            NSError *err;
            [eventDB saveReminder:reminder commit:YES error:&err];
            if (err) {
                
            }
        }
    }];
}