问题
Presenting an instance of FBFriendPickerViewController using presentViewController:animated:completion: is pretty straightforward and the class seems like it is meant for that use case. However, I want to push an instance of FBFriendPickerViewController onto an instance of UINavigationController using pushViewController:animated:.
Consider the following code as an example:
self.fbFriendPickerController = [[FBFriendPickerViewController alloc] init];
self.fbFriendPickerController.hidesBottomBarWhenPushed = YES;
// configure stuff
[[self navigationController] pushViewController:self.fbFriendPickerController animated:YES];
However, the problem is that the instance of FBFriendPickerViewController already has a top navigation bar. When pushed onto a UINavigationController, this results in two top navigation bars stacked vertically, as you can see in the screenshot below.
One solution would be to hide the top nav bar of the UINavigationController, but that creates an awkward transition and there is no back button. Any thoughts on the best way to keep the UINavigationController top nav bar but the hide the FBFriendPickerViewController top nav bar?
回答1:
After looking through the Facebook iOS SDK source code on Github, I figured this out. FBFriendPickerViewController is a subclass of FBViewController. If you set the doneButton and cancelButton properties of any FBViewController to nil, FBViewController will remove the top navigation bar. As a result, the following code works:
self.fbFriendPickerController = [[FBFriendPickerViewController alloc] init];
self.fbFriendPickerController.hidesBottomBarWhenPushed = YES;
self.fbFriendPickerController.doneButton = nil;
self.fbFriendPickerController.cancelButton = nil;
// configure stuff
[[self navigationController] pushViewController:self.fbFriendPickerController animated:YES];
来源：https://stackoverflow.com/questions/13428181/hide-fbfriendpickerviewcontroller-navbar-when-pushing-onto-uinavigationcontrolle