UIDocumentInteractionController不显示邮件选项

Question

继承我的应用程序中的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

我的应用程序

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

Apple示例项目

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];

我应该怎样做才能获得邮件选项？

Answer 1

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

根据Apple Docs的说法UIDocumentInteractionController

因为-presentOpenInMenuFromBarButtonItem:animated:它说:

此方法与该方法类似 presentOptionsMenuFromBarButtonItem:animated:,但提供的菜单仅限于能够打开当前文档的应用程序列表.此确定基于文档类型(由UTI属性指示)和已安装应用程序支持的文档类型.
...
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:

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];