UIDocumentInteractionController 日历访问

我有一个 ics（日历）文件，我用UIDocumentInteractionController, using presentOptionsMenuFromRect:。运行时，“打开方式”菜单看起来像this https://i.stack.imgur.com/uvU4Z.png.

如您所见，没有“添加到日历”选项。这就是让我困惑的地方：我对 .vcf（联系人卡片）文件使用相同的代码，并且它按预期工作 https://i.stack.imgur.com/yxgJh.png可以使用“在联系人中打开”选项。

我是否缺少某种许可Info.plist用于日历访问？为什么不能UIDocumentInteractionController处理.ics文件类型正确，但是.vcf工作得很好吗？这两种文件类型非常相似。从选项菜单中，如果我将 ics 文件邮寄给自己并从邮件应用程序打开它，它会很好地读取它，并且我可以将事件添加到我的日历中，因此我知道数据是有效的。我到处寻找解决方案，但似乎没有人知道为什么日历访问不起作用。我遇到的一些问题仍未得到解答：

无法将 ics 文件添加到日历 https://stackoverflow.com/questions/20992426/uidocumentinteractioncontroller-unable-to-add-ics-file-to-calendar

如何让 UIDocumentInteractionController 将日历显示为打开 .ics 文件的选项？ https://stackoverflow.com/questions/18830805/how-can-i-have-uidocumentinteractioncontroller-show-calendar-as-an-option-for-op

如果苹果是故意这样做的，我能想到的唯一原因是他们宁愿开发人员使用 EventKit 将事件添加到日历中。如果属实，那么该解决方案将相当令人沮丧。任何对此问题的见解将不胜感激。

我最终通过 (https://github.com/KiranPanesar/MXLCalendarManager https://github.com/KiranPanesar/MXLCalendarManager）。然后，我可以使用 EventKit 将下载的 .ics 文件解析为 EKEvent 并通过 EKEventEditViewController 打开它（https://developer.apple.com/library/prerelease/ios/samplecode/SimpleEKDemo/Listings/Classes_RootViewController_m.html https://developer.apple.com/library/prerelease/ios/samplecode/SimpleEKDemo/Listings/Classes_RootViewController_m.html）。有点绕，但似乎有效。以下是我如何设置实现此功能的 webview 控制器类：

@interface WebViewController : UIViewController <UIWebViewDelegate, EKEventEditViewDelegate> {

// EKEventStore instance associated with the current Calendar application
@property (nonatomic, strong) EKEventStore *eventStore;

// Default calendar associated with the above event store
@property (nonatomic, strong) EKCalendar *defaultCalendar;

@end


@implementation WebViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    ...
    // Initialize the event store
    self.eventStore = [[EKEventStore alloc] init];
}


- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    NSURL *url = [request URL];
    NSString *path = [url absoluteString];

    NSRange range = [path rangeOfString:@".ics" options:NSCaseInsensitiveSearch];
    if (range.length > 0) {
        [self checkCalendarAndAddEvent:url];
        return NO;
    }
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;

    return YES;
}

-(void)checkCalendarAndAddEvent:(NSURL*)url
{
     EKAuthorizationStatus status = [EKEventStore authorizationStatusForEntityType:EKEntityTypeEvent];
     if(status == EKAuthorizationStatusAuthorized)
     {
         [self addEventToCalendar:url];
     } else
     {
         [self.eventStore requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error)
         {
             if (granted)
             {
                  // Let's ensure that our code will be executed from the main queue
                  dispatch_async(dispatch_get_main_queue(), ^{
                     // The user has granted access to their Calendar; add to calendar
                     [self addEventToCalendar:url];
                  });
             }else
             {
                 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Privacy Warning" message:@"Permission was not granted for Calendar"
                                                            delegate:nil
                                                   cancelButtonTitle:@"OK"
                                                   otherButtonTitles:nil];
                 [alert show];
             }
         }];
    }
}

-(void) addEventToCalendar: (NSURL *)url
{
    MXLCalendarManager* calendarManager = [[MXLCalendarManager alloc] init];
    self.defaultCalendar = self.eventStore.defaultCalendarForNewEvents;
    [calendarManager scanICSFileAtRemoteURL:url withCompletionHandler:^(MXLCalendar *calendar, NSError *error) {

        MXLCalendarEvent *mxlEvent = calendar.events.firstObject;

        EKEventEditViewController *addController = [[EKEventEditViewController alloc] init];
        EKEvent * event = [EKEvent eventWithEventStore:self.eventStore];
        event.location = mxlEvent.eventLocation;
        event.startDate = mxlEvent.eventStartDate;
        event.endDate = mxlEvent.eventEndDate;
        event.title = mxlEvent.eventSummary;
        event.notes = mxlEvent.eventDescription;

        addController.event = event;
        // Set addController's event store to the current event store
        addController.eventStore = self.eventStore;
        addController.editViewDelegate = self;
        [self presentViewController:addController animated:YES completion:nil];
   }];
}
@end

我还必须稍微修改 MXLCalendarManager.m 的部分内容，以便为我的特定类型的 .ics 格式做好准备。例如，我的 .ics 文件的摘要部分如下所示：

DESCRIPTION;LANGUAGE=en-us:The following details your appointment:\n\n\n

其中 MXLCalendarManager 仅寻找：

DESCRIPTION: (Something). 

我修改了代码以考虑 ;ln.这也删除了所有人为换行符，但允许我在摘要描述中添加自己的换行符：

    // Extract event description
    [eventScanner scanUpToString:@"DESCRIPTION" intoString:nil];
    [eventScanner scanUpToString:@":" intoString:nil];
    [eventScanner scanUpToString:@"\nSEQUENCE" intoString:&descriptionString];
    if(descriptionString.length > 1)
    {
        descriptionString = [descriptionString substringFromIndex:1];
        descriptionString = [[[descriptionString stringByReplacingOccurrencesOfString:@"\nSEQUENCE" withString:@""] stringByReplacingOccurrencesOfString:@"\r\n " withString:@""] stringByReplacingOccurrencesOfString:@"\\n" withString:@"\n"];
    }