UIDocumentInteractionController显示带有选项的不需要的行为

Question

我按下其中一个文档交互控制器按钮，即邮件等后，我收到以下错误：

LaunchServices: invalidationHandler called

我的电子邮件未配置iPhone设备。我想显示该警告。

以下是创建交互控制器的代码 - URL等都是有效的，但是委托调用没有命中我的控制器，即使我已经实现了委托方法。

- (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];
}

}

UIDocumentInteractionDelegate方法

- (void)documentInteractionController:(UIDocumentInteractionController *)controller
    willBeginSendingToApplication:(NSString *)application
{
     NSLog(@"Will Begin: %@", application);   
}

- (void)documentInteractionController:(UIDocumentInteractionController *)controller 
       didEndSendingToApplication:(NSString *)application
{
    NSLog(@"Did End: %@", application);    
}