iOS学习之UINavigationController详解与使用(三)ToolBar

1、显示Toolbar 

在RootViewController.m的- (void)viewDidLoad方法中添加代码，这样Toobar就显示出来了。

 [self.navigationController  setToolbarHidden:NO animated:YES];

2、在ToolBar上添加UIBarButtonItem

新建几个UIBarButtonItem，然后以数组的形式添加到Toolbar中

 UIBarButtonItem *one = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:nil action:nil];
     UIBarButtonItem *two = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks target:nil action:nil];
     UIBarButtonItem *three = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:nil action:nil];
     UIBarButtonItem *four = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:nil action:nil];
     UIBarButtonItem *flexItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
     [self setToolbarItems:[NSArray arrayWithObjects:flexItem, one, flexItem, two, flexItem, three, flexItem, four, flexItem, nil]];

效果：

注意：用   [self.navigationController.toolbar setItems:(NSArray *) animated:<#(BOOL)#>]这个方法添加item是不起效果的。下面我动态自己添加Toolbar时，这个才起效果。

3、动态添加Toolbar

我们在SecondView添加动态的Toolbar。

在SecondViewController.h添加

 #import <UIKit/UIKit.h>

 @interface SecondViewController : UIViewController
 {
     UIToolbar *toolBar;
 }
 @end

在SecondViewController.m添加

 - (void)viewDidLoad
 {
     [super viewDidLoad];

     [self.navigationController  setToolbarHidden:YES animated:YES];

     UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:self action:@selector(gotoThridView:)];
     toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0.0, self.view.frame.size.height - toolBar.frame.size.height - 44.0, self.view.frame.size.width, 44.0)];
     [toolBar setBarStyle:UIBarStyleDefault];
     toolBar.autoresizingMask = UIViewAutoresizingFlexibleTopMargin;
     [toolBar setItems:[NSArray arrayWithObject:addButton]];
     [self.view addSubview:toolBar];

     // Do any additional setup after loading the view from its nib.
 }

先把RootView时显示的Toobar隐藏

    [self.navigationController setToolbarHidden:YESanimated:YES];然后把新建的Toolbar添加的SecondView中，并为Toobar设置了一个Item.  

    [toolBarsetItems:[NSArrayarrayWithObject:addButton]]; 

BarButtonItem用 的是UIBarButtonSystemItemSearch, 效果如下：

4、新建ThridView，从SecondView跳转到

Commad+N新建一个ThridViewController，

这个addButton跳转到ThridView

 -(void)gotoThridView:(id)sender
 {
     ThridViewController *thridView = [[ThridViewController alloc] init];
     [self.navigationController pushViewController:thridView animated:YES];
     thridView.title = @"Thrid View";

 }

跳转Second到Third效果：

到此UINavigationController练习的差不多了。