Objective c ABPeoplePickerNavigationController在不显示通讯簿的情况下自动关闭

我正在使用ABPeoplePickerNavigationController按用户选择通讯簿联系人。此代码隐藏在按钮操作的后面：

ABPeoplePickerNavigationController *picker = [[ABPeoplePickerNavigationController alloc] init];

picker.peoplePickerDelegate = self;
picker.view.frame=self.view.frame;
[self presentModalViewController:picker animated:YES];
[picker release];

当此代码运行时，它将横向UI旋转为纵向，并最终取消显示此ABPeoplePickerNavigationController的控制器

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我只在iOS5和iPad2上遇到这个问题。它在iOS 6上运行得很好。

我不相信5.x支持此选择器的横向功能。但是，请尝试使用不同的演示方式。我认为它应该适用于景观，即：

ABPeoplePickerNavigationController *picker = [[ABPeoplePickerNavigationController alloc] init];
picker.peoplePickerDelegate = self;
picker.modalPresentationStyle  = UIModalPresentationFormSheet;
[self presentModalViewController:picker animated:YES];