UIDocumentInteractionController 日历访问

Question

我有一个 ics（日历）文件，我用 UIDocumentInteractionController 打开，使用 presentOptionsMenuFromRect:。运行时，“打开方式”菜单看起来像 this。

如您所见，没有“添加到日历”选项。这让我明白了：我对 .vcf（联系人卡片）文件使用了相同的代码，它 works as expected 带有可用的“在联系人中打开”选项。

我的Info.plist 中是否缺少某种访问日历的权限？为什么UIDocumentInteractionController 不能正确处理.ics 文件类型，但.vcf 工作得很好？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中打开它，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：

Unable to Add ics file to Calendar

How can I have UIDocumentInteractionController show Calendar as an option for opening a .ics file?

如果 Apple 是故意这样做的，我能想到的唯一原因是因为他们宁愿开发人员使用 EventKit 将事件添加到日历中。如果属实，该解决方案相当令人沮丧。对此问题的任何见解将不胜感激。

Answer 1

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

@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

MXLCalendarManager 只在哪里寻找：

DESCRIPTION: (Something). 

我修改了这样的代码来解释 ;ln。这也删除了所有人工换行符，但允许我在摘要描述中添加自己的：

    // 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"];
    }