最重要 添加#import <EventKit/EventKit.h> 庫

EKEventStore *eventStore = [[EKEventStore alloc] init];
            //請求使用用戶的日歷數據庫
            if ([eventStore respondsToSelector:@selector(requestAccessToEntityType:completion:)])
            {
                [eventStore requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error) {
                    dispatch_async(dispatch_get_main_queue(), ^{
                        if (error){
                            //錯誤信息 這里顯示錯誤消息
                        }else if (!granted){
                            //被用戶拒絕，不允許訪問日歷 拒絕訪問顯示錯誤消息
                        }else{
                            // 數據訪問權限
                            // ***** 在這里做重要的事情 *****
                            
                            //事件保存到日歷
                            //06.07 元素
                            //title(標題 NSString),
                            //location(位置NSString),
                            //startDate(開始時間 2016/06/07 11:14AM),
                            //endDate(結束時間 2016/06/07 11:14AM),
                            //addAlarm(提醒時間 2016/06/07 11:14AM),
                            //notes(備注類容NSString)
                            
                            //創建事件
                            EKEvent *event  = [EKEvent eventWithEventStore:eventStore];
                            event.title  = @"測試寫入日歷事件";
                            event.location = @"北京海淀";
                            
                            NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init];
                            [dateFormatter setAMSymbol:@"AM"];
                            [dateFormatter setPMSymbol:@"PM"];
                            [dateFormatter setDateFormat:@"yyyy/MM/dd hh:mmaaa"];
                            NSDate *date = [NSDate date];
                            NSString * s = [dateFormatter stringFromDate:date];
                            DLog(@"%@",s);
                            
                            //開始時間(必須傳)
                            event.startDate = [date dateByAddingTimeInterval:60 * 2];
                            //結束時間(必須傳)
                            event.endDate   = [date dateByAddingTimeInterval:60 * 5 * 24];
                            //                    event.endDate   = [[NSDate alloc]init];
                            //                    event.allDay = YES;//全天
                            
                            //添加提醒
                            //第一次提醒  (幾分鐘后)
                            [event addAlarm:[EKAlarm alarmWithRelativeOffset:60.0f * -1.0f]];
                            //第二次提醒  ()
                            //                    [event addAlarm:[EKAlarm alarmWithRelativeOffset:60.0f * -10.0f * 24]];
                            
                            //06.07 add 事件類容備注
                            NSString * str = ws.model.remark;
                            event.notes = [NSString stringWithFormat:@"%@",str];
                            
                            [event setCalendar:[eventStore defaultCalendarForNewEvents]];
                            NSError *err;
                            
                            [eventStore saveEvent:event span:EKSpanThisEvent error:&err];
                            
                            DLog(@"保存成功");
                            
                            //直接殺死進程
                            exit(2);
                            
                        }
                    });
                }];
            }