UIDocumentInteractionController不显示邮件选项

Question

来自我的应用程序的UIDocuemtnInteractionController（不显示邮件选项）

这是Apples示例项目使用的那个

以下是各自的代码

我的申请

docInteractionController = [UIDocumentInteractionController interactionControllerWithURL:fileURL];
[docInteractionController presentOpenInMenuFromBarButtonItem:(UIBarButtonItem*)sender animated:YES];

Apple Sample Project

NSURL *fileURL;
if (cellIndexPath.section == 0)
{
    // for section 0, we preview the docs built into our app
    fileURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:documents[cellIndexPath.row] ofType:nil]];
}
else
{
    // for secton 1, we preview the docs found in the Documents folder
    fileURL = [self.documentURLs objectAtIndex:cellIndexPath.row];
}
self.docInteractionController.URL = fileURL;

[self.docInteractionController presentOptionsMenuFromRect:longPressGesture.view.frame
                                                   inView:longPressGesture.view
                                                 animated:YES];

我应该做什么来获取邮件选项？

Answer 1

要提供Mail选项，-presentOpenInMenuFromBarButtonItem:需要-presentOptionsMenuFromRect:

根据Apple Docs on UIDocumentInteractionController

对于-presentOpenInMenuFromBarButtonItem:animated:，它说：

  

这种方法类似于    presentOptionsMenuFromBarButtonItem:animated: 方法，但提出了一个   菜单仅限于能够打开当前的应用列表   文献。该确定基于文档类型（如   由UTI属性指示）和支持的文档类型   已安装的应用程序   ...
  如果没有支持打开文档的注册应用程序，则   文档交互控制器不显示菜单。

所以：

1. 要显示打开文件的选项，请使用-presentOpenInMenuFromBarButtonItem:
2. 要提供适用于该文件的所有可能选项，请使用-presentOptionsMenuFromBarButtonItem:或通用-presentOptionsMenuFromRect:

---

另外......对于任何文件，最好指定UTI类型：

实施例

docInteractionController = [UIDocumentInteractionController interactionControllerWithURL:fileURL];
//[docInteractionController setDelegate:self];
[docInteractionController setUTI:@"public.data"];
[docInteractionController presentOptionsMenuFromBarButtonItem:(UIBarButtonItem*)sender 
                                                animated:YES];
//or a generic method
//[docInteractionController presentOptionsMenuFromRect:sender.frame
//                                            animated:YES];