iOS中隐藏UINavigationBar的方法

如果想在root view controller中把UINavigationBar隐藏，如何做呢？其实我们只需要实现UINavigationController的一个delegate方法就行了。代码如下：

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {if ( viewController ==  rootViewController) {[navigationController setNavigationBarHidden:YES animated:animated];} else if ( [navigationController isNavigationBarHidden] ) {[navigationController setNavigationBarHidden:NO animated:animated];}}