IOS之日历与提醒

IOS利用EventKit可以实现添加提醒和添加事件（日历）的功能

EKEventStore类
该类负责日历和提醒事件的管理，可以简单理解为数据库，可以对事件进行增删改查。
查询今天暂且不表，只说如何添加事件和提醒。 
因为它就像数据库一样，频繁的开启，关闭会影响效率，所以如果你的程序需要频繁操作日历和提醒，
建议仅生成该对象一次，仅用一个对象进行操作。

@interface ViewController ()@end

@implementation ViewController

- (void)viewDidLoad{
    [super viewDidLoad];
    [self addEventNotify:[NSDate dateWithTimeIntervalSinceNow:60] title:@"测试事件"];
}


-(void)addEventNotify:(NSDate *)date title:(NSString *)title
{
//生成事件数据库对象 
    EKEventStore *eventDB = [[EKEventStore alloc] init];
//申请事件类型权限 
    [eventDB requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError * _Nullable error) {
        if (granted) { //授权是否成功
            EKEvent *myEvent  = [EKEvent eventWithEventStore:eventDB]; //创建一个日历事件
            myEvent.title     = title;  //标题
            myEvent.startDate = date; //开始date   required
            myEvent.endDate   = date;  //结束date    required
            [myEvent addAlarm:[EKAlarm alarmWithAbsoluteDate:date]]; //添加一个闹钟  optional
            [myEvent setCalendar:[eventDB defaultCalendarForNewEvents]]; //添加calendar  required
            NSError *err;
            [eventDB saveEvent:myEvent span:EKSpanThisEvent error:&err]; //保存
        }
    }];
}

-(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) {

            }
        }
    }];
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end