iOS开发：事件、提醒与联系人数据处理

# iOS开发：事件、提醒与联系人数据处理 ## 1. 创建循环事件 在处理日历事件时，Event Kit框架提供了强大的API来创建循环事件。以下是创建循环事件的示例代码： ```objc - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { if (buttonIndex == 1) { // OK button tapped // Calculate the date exactly one day from now NSCalendar *calendar = [NSCalendar currentCalendar]; NSDateComponents *aDayFromNowComponents = [[NSDateComponents alloc] init]; aDayFromNowComponents.day = 1; NSDate *now = [NSDate date]; NSDate *aDayFromNow = [calendar dateByAddingComponents:aDayFromNowComponents toDate:now options:0]; // Create the event EKEvent *event = [EKEvent eventWithEventStore:self.eventStore]; event.title = [alertView textFieldAtIndex:0].text; event.calendar = [self.eventStore defaultCalendarForNewEvents]; event.startDate = aDayFromNow; event.endDate = [NSDate dateWithTimeInterval:60*60.0 sinceDate:event.startDate]; // Make it recur EKRecurrenceRule *repeatEverySecondWednesdayRecurrenceRule = [[EKRecurrenceRule alloc] initRecurrenceWithFrequency:EKRecurrenceFrequencyDaily interval:2 daysOfTheWeek:@[[EKRecurrenceDayOfWeek dayOfWeek:4]] daysOfTheMonth:nil monthsOfTheYear:nil weeksOfTheYear:nil daysOfTheYear:nil setPositions:nil end:[EKRecurrenceEnd recurrenceEndWithOccurrenceCount:20]]; event.recurrenceRules = @[repeatEverySecondWednesdayRecurrenceRule]; // Save the event and update the table view [self.eventStore saveEvent:event span:EKSpanThisEvent error:nil]; [self refresh:self]; } } ``` ### 1.1 EKRecurrenceRule参数说明 | 参数 | 说明 | | --- | --- | | initRecurrenceWithFrequency | 指定事件重复的基本频率，如每日、每周、每月或每年 | | interval | 根据频率指定重复间隔，如每周频率且间隔为3，则每三周重复一次 | | daysOfTheWeek | 接受一个NSArray对象，通过`EKRecurrenceDayOfWeek dayOfWeek`方法访问，1表示周日，可指定事件仅在特定星期几重复 | | daysOfTheMonth | 类似于`daysOfTheWeek`，指定每月的特定日期，仅适用于每月频率的事件 | | monthsOfTheYear | 类似于`daysOfTheWeek`和`daysOfTheMonth`，仅适用于每年频率的事件 | | weeksOfTheYear | 仅适用于每年频率的事件，指定特定的周 | | daysOfTheYear | 仅适用于每年重复的事件，可指定从年初或年末开始的特定日期 | | setPositions | 终极过滤器，可将事件限制在一年中的特定日期 | | end | 需要调用`EKRecurrenceEnd`类，指定事件不再重复的条件，有`recurrenceEndWithEndDate`（指定日期后不再重复）和`recurrenceEndWithOccurenceCount`（限制重复次数）两种方法 | 根据上述代码和参数说明，创建的示例循环事件将每两周的周三重复，最多重复20次。 ## 2. 创建提醒 在iOS 6中，Apple发布了API，允许应用向Reminders应用添加条目。以下是创建提醒的详细步骤： ### 2.1 设置应用 1. 创建一个新的单视图应用项目。 2. 链接`EventKit.framework`和`CoreLocation.framework`到项目。 3. 在项目属性列表中添加使用说明： - 添加`Privacy – Location Usage Description`键，值为`Testing Location-Based Reminders`。 - 添加`Privacy – Reminders Usage Description`键，值为`Testing Reminders`。 4. 在`ViewController.xib`中创建用户界面，包含两个按钮和一个Activity Indicator，并设置Activity Indicator的`Hides When Stopped`复选框。 5. 创建按钮的动作`addTimeBasedReminder`和`addLocationBasedReminder`，以及Activity Indicator的出口`activityIndicator`。 6. 在`ViewController.h`中导入相关API并声明`eventStore`属性： ```objc // // ViewController.h // Remind Me // #import <UIKit/UIKit.h> #import <EventKit/EventKit.h> #import <CoreLocation/CoreLocation.h> @interface ViewController : UIViewController<CLLocationManagerDelegate> @property (weak, nonatomic) IBOutlet UIActivityIndicatorView *activityIndicator; @property (strong, nonatomic)EKEventStore *eventStore; - (IBAction)addTimeBasedReminder:(id)sender; - (IBAction)addLocationBasedReminder:(id)sender; @end ``` 7. 在`ViewController.m`中添加`eventStore`的自定义getter： ```objc - (EKEventStore *)eventStore { if (_eventStore == nil) { _eventStore = [[EKEventStore alloc] init]; } return _eventStore; } ``` ### 2.2 请求访问提醒 在`ViewController.h`中声明块类型和方法签名： ```objc typedef void(^RestrictedEventStoreActionHandler)(); @interface ViewController : UIViewController<CLLocationManagerDelegate> @property (weak, nonatomic) IBOutlet UIActivityIndicatorView *activityIndicator; @property (strong, nonatomic)EKEventStore *eventStore; - (IBAction)addTimeBasedReminder:(id)sender; - (IBAction)addLocationBasedReminder:(id)sender; - (void)handleReminderAction:(RestrictedEventStoreActionHandler)block; @end ``` 在`ViewController.m`中实现`handleReminderAction`方法： ```objc - (void)handleReminderAction:(RestrictedEventStoreActionHandler)block { [self.eventStore requestAccessToEntityType:EKEntityTypeReminder completion:^(BOOL granted, NSError *error) { if (granted) { block(); } else { UIAlertView *notGrantedAlert = [[UIAlertView alloc] initWithTitle:@"Access Denied" message:@"Access to device's reminders has been denied for this app." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; dispatch_async(dispatch_get_main_queue(), ^{ [notGrantedAlert show]; }); } }]; } ``` ### 2.3 创建基于时间的提醒 以下是创建基于时间提醒的完整代码： ```objc - (IBAction)addTimeBasedReminder:(id)sender { [self.activityIndicator startAnimating]; [self handleReminderAction:^() { // Create Reminder EKReminder *newReminder = [EKReminder reminderWithEventStore:self.eventStore]; newReminder.title = @"Simpsons is on"; newReminder.calendar = [self.eventStore defaultCalendarForNewReminders]; // Calculate the date exactly one day from now NSCalendar *calendar = [NSCalendar currentCalendar]; NSDateComponents *oneDayComponents = [[NSDateComponents alloc] init]; oneDayComponents.day = 1; NSDate *nextDay = [calendar dateByAddingComponents:oneDayComponents toDate:[NSDate date] options:0]; NSUInteger unitFlags = NSEraCalendarUnit | NSYearCalendarUnit | N ```