UINavigationController詳解與使用(二)頁面切換和segmentedCon...

一、RootView 跳到SecondView

首先咱們須要新一個View。新建SecondView，按住Command鍵而後按N,彈出新建頁面，咱們新建SecondView

 

二、爲Button 添加點擊事件，實現跳轉

在RootViewController.xib中和RootViewController.h文件創建鏈接

 

在RootViewController.m中實現代碼，alloc一個SecondViewController，用pushViewController到navigationController中去，併爲

SecondViewController這是title爲    secondView.title =@"Second View"; 默認狀況下，titie爲下個頁面返回按鈕的名字。

- (IBAction)gotoSecondView:(id)sender {
    SecondViewController *secondView = [[SecondViewController alloc] init];
    [self.navigationController pushViewController:secondView animated:YES];
    secondView.title = @"Second View";
}

這是點擊GotoSecondView 按鈕，出現

這就是SecondView了。

 

三、添加segmentedController

在nav bar這樣的效果是如何實現的呢?

這就是segmentedController。

3.1在RootViewController.m的viewDidLoad添加以下代碼:

NSArray *array = [NSArray arrayWithObjects:@"雞翅",@"排骨", nil];
   UISegmentedControl *segmentedController = [[UISegmentedControl alloc] initWithItems:array];
   segmentedController.segmentedControlStyle = UISegmentedControlSegmentCenter;

   [segmentedController addTarget:self action:@selector(segmentAction:) forControlEvents:UIControlEventValueChanged];
   self.navigationItem.titleView = segmentedController;

3.2[segmentedController addTarget:selfaction:的實現

-(void)segmentAction:(id)sender
{
    switch ([sender selectedSegmentIndex]) {
        case 0:
        {
            UIAlertView *alter = [[UIAlertView alloc] initWithTitle:@"提示" message:@"你點擊了雞翅" delegate:self  cancelButtonTitle:@"肯定" otherButtonTitles:nil, nil];
            [alter show];

        }
        break;
    case 1:
        {
            UIAlertView *alter = [[UIAlertView alloc] initWithTitle:@"提示" message:@"你點擊了排骨" delegate:self  cancelButtonTitle:@"肯定" otherButtonTitles:nil, nil];
            [alter show];
        }
        break;

        default:
            break;
    }
}

這樣就能響應雞翅和排骨按鈕了

四、自定義backBarButtonItem

左上角的返回上級View的barButtonitem的名字是上級目錄的Title，若是title或者適合作button的名字，怎麼辦呢？咱們能夠本身定義

代碼以下：

UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"根視圖" style:UIBarButtonItemStyleDone target:nil action:nil];
   self.navigationItem.backBarBu

效果：

六、自定義title

UINavigationController的title能夠用別view替代，好比用UIButton UILable等，下面我用UIButton.

在SecondViewController.m中添加下面以下。

- (void)viewDidLoad
{
    [super viewDidLoad];
    UIButton *button = [UIButton buttonWithType: UIButtonTypeRoundedRect];
    [button setTitle: @"自定義title" forState: UIControlStateNormal];
    [button sizeToFit];
    self.navigationItem.titleView = button;}

運行程序，goto secondView，運行效果

例子代碼：https://github.com/schelling/YcDemo