Iphone UIToolbar和UINavigationController

我需要以模式显示视图。需要以模式显示的viewcontroller底部必须有一个UIToolbar。在此工具栏中有一个包含三个元素的uisegmentedcontroller。（想想tabbar）

在显示模态viewcontroller的viewcontroller中，我有：

-(IBAction)presentModally:(id)sender {  

if (self.nvc == nil) {
    MyModalViewController *vc = [[MyModalViewController alloc] init];
    UINavigationController *navvc = [[UINavigationController alloc] initWithRootViewController:vc];
    navvc.navigationItem.prompt = @"";
    navvc.navigationBar.barStyle = UIBarStyleBlack;
    [vc release];
    self.nvc = navvc;
    [navvc release];
}

[self presentModalViewController:self.nvc animated:YES];

}

MyModalViewController:

- (void)loadView {
[super loadView];

UIView *uiview = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 320.0f, 460.0f)];
uiview.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
self.view = uiview;
[uiview release];

UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0.0f, 436.0f, 320.0f, 44.0f)];
toolbar.barStyle = UIBarStyleBlack;
toolbar.autoresizingMask = UIViewAutoresizingFlexibleWidth;

NSArray *itemArray = [NSArray arrayWithObjects: @"One", @"Two", @"Three", nil];
UISegmentedControl *segCon = [[UISegmentedControl alloc] initWithItems:itemArray];
segCon.frame = CGRectMake(60, 4, 200, 36);
segCon.segmentedControlStyle = UISegmentedControlStyleBar;
segCon.tintColor = [UIColor darkGrayColor];
segCon.selectedSegmentIndex = 0;
[segCon addTarget:self action:@selector(changedSegment:) forControlEvents:UIControlEventValueChanged];

[toolbar addSubview:segCon];
self.segmentedControl = segCon;
[segCon release];

[[self navigationController].view addSubview:toolbar];
[toolbar release];
}


- (void)changedSegment:(id)sender {

UISegmentedControl *control = (UISegmentedControl *)sender;
int index = control.selectedSegmentIndex;

[[self navigationController] popViewControllerAnimated:NO];
[[self navigationController] pushViewController:[self.controllers objectAtIndex:index] animated:NO];
}

阵列中的ViewController只是普通的UIViewController

我已将这些类中的此属性设置为：

self.navigationItem.hidesBackButton = YES;

---

我的问题：这是实现UITabBarController行为的正确方法吗？

没有测试它，但它看起来不错，除了

popViewControllerAnimated

。我会改用

PoptorootViewController激活的

（以防控制器本身使用导航控制器）。

为什么不使用UITabBarController呢？除显示“选项卡栏”外，您没有使用导航控制器的任何功能。因为只有Apple才允许将UtiAbbarController添加到应用程序的根窗口中。