按下邮件按钮时不调用UIDocumentInteractionController委托方法

Question

我想显示警告消息当设备上没有配置邮件时。但是当我从文档交互单击邮件时，它只是简单地关闭控制器，以下两个委托方法都不会调用。请参阅图像以便更好地理解。

请帮忙。在此先感谢

- (void)openAppList:(FileInfo *)fileinfo {

    NSURL *fileURL = [NSURL fileURLWithPath:fileinfo.fullName];

    UIDocumentInteractionController *interactionController = [UIDocumentInteractionController interactionControllerWithURL:fileURL];

    [interactionController retain];

    interactionController.delegate = self;
    BOOL present = [interactionController presentOptionsMenuFromRect:CGRectZero inView:self.tabBarController.view animated:YES];
    if (!present) {
    [MainteOrErrorDialog initWithErrorCode:kAlertNotOpenInFileId filename:fileInfo.filename target:nil action:nil];
    } else {
    [interactionController retain];
    }

}

#pragma UIDocumentInteractionDelegate
- (void)documentInteractionController:(UIDocumentInteractionController *)controller
        willBeginSendingToApplication:(NSString *)application
{

}

- (void)documentInteractionController:(UIDocumentInteractionController *)controller 
           didEndSendingToApplication:(NSString *)application
{

}

Answer 1

不幸的是，您无法通过UIDocumentInteractionController与Mail委托进行真正的交互。 UIDocumentInteractionController极其局限于您可以使用它支持的所有应用程序的属性和属性，您甚至无法将邮件消息正文设置为自定义消息。实际上，在iOS 6.0中不推荐使用documentInteractionController:canPerformAction:，因为Apple正在向UIActivityViewController发展。 They're own deprecated statement是：

  

应用应使用UIActivityViewController进行操作

---

或者，您可以使用UIActivityViewController。

解决这个问题，实现UIActivityViewController，它们都支持相同的应用程序并检查用户是否可以发送电子邮件，如果没有，则从菜单中排除Mail：

if ([MFMailComposeViewController canSendMail]) {
      NSArray *shareItems;
      shareItems = @[[Config emailMessage], snapshot]; //emailMessage is an NSString containing the body of the mail or mms message located in a different VC
      UIActivityViewController *activityController = [[UIActivityViewController alloc] initWithActivityItems:shareItems applicationActivities:nil];
      [activityController setCompletionWithItemsHandler:(UIActivityViewControllerCompletionWithItemsHandler)^(NSString *string, BOOL completed) {
      }
      [self presentViewController:activityController animated:YES completion:nil];
 } else {
      NSArray *shareItems;
      shareItems = @[[Config emailMessage], snapshot]; //emailMessage is an NSString containing the body of the mail or mms message located in a different VC
      UIActivityViewController *activityController = [[UIActivityViewController alloc] initWithActivityItems:shareItems applicationActivities:nil];
      activityController.excludedActivityTypes = @[UIActivityTypeMail];
      [activityController setCompletionWithItemsHandler:(UIActivityViewControllerCompletionWithItemsHandler)^(NSString *string, BOOL completed) {
      }
      [self presentViewController:activityController animated:YES completion:nil];
 }