UINavigationController(3)

1、顯示Toolbar 

在RootViewController.m的- (void)viewDidLoad方法中添加代碼，這樣Toobar就顯示出來了。

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

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

2、在ToolBar上添加UIBarButtonItem

新建幾個UIBarButtonItem，然後以數組的形式添加到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]];

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)#>]這個方法添加item是不起效果的。下面我動態自己添加Toolbar時，這個才起效果。

3、動態添加Toolbar

我們在SecondView添加動態的Toolbar。

在SecondViewController.h添加

#import <UIKit/UIKit.h>

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

#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.
}

- (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時顯示的Toobar隱藏

    [self.navigationController setToolbarHidden:YESanimated:YES];然後把新建的Toolbar添加的SecondView中，併爲Toobar設置了一個Item.  

    [toolBarsetItems:[NSArrayarrayWithObject:addButton]]; 

BarButtonItem用 的是UIBarButtonSystemItemSearch, 效果如下：

4、新建ThridView，從SecondView跳轉到

Commad+N新建一個ThridViewController，

這個addButton跳轉到ThridView

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

}

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

}

跳轉Second到Third效果：

到此UINavigationController練習的差不多了。

前面兩篇：

iOS學習之UINavigationController詳解與使用(一)添加UIBarButtonItem

iOS學習之UINavigationController詳解與使用(二)頁面切換和segmentedController  

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

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