所有的实现都在UInavigionController的rootViewController中实现。
导航控制器维护一个视图控制器栈，任何类型的视图控制器都可以放入栈中。在设计导航器时，需要指定用户看到的第一个视图。该视图是层次结构中最底层的视图，其控制器称为根视图控制器。在根视图控制器的视图上方是UINavigationItem 控件。这个控件是根控制器入栈后，它也随之进入UINavigationBar的栈，，并作为栈顶，它代表着当前导航器的状态。
UITabBarController 和 UInavigionController一般作为应用程序的主控制器被加载，但他们都要设置根视图控制器去显示根视图控制器的view，让其加载在他们的view上。
//// ViewController.m// NavigationBarMuliBars//// Created by apple on 12-7-5.// Copyright (c) 2012年 __MyCompanyName__. All rights reserved.//#import "ViewController.h"@interface ViewController ()@end@implementation ViewController@synthesize titleLabel;@synthesize titleButton;@synthesize indicator;@synthesize leftButton;@synthesize testButton;- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];if (self) {// Custom initialization}return self;}- (void)viewDidLoad{[super viewDidLoad];// Do any additional setup after loading the view from its nib.//设置导航栏标题//self.navigationItem.title = @"题目";NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"navTitleLabel" owner:self options:nil];if([nib count] > 0){NSLog(@"自定义导航栏标题成功");}//自定义label的导航栏标题//self.navigationItem.titleView = self.titleLabel;//自定义button的导航栏标题self.navigationItem.titleView = self.titleButton;//添加多个右按钮UIBarButtonItem *rightButton1 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonItemStyleDone target:self action:nil];UIBarButtonItem *rightButton2 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonItemStyleDone target:self action:nil];NSArray *buttonArray = [[NSArray alloc] initWithObjects:rightButton1,rightButton2 ,nil];self.navigationItem.rightBarButtonItems = buttonArray;[rightButton1 release];[rightButton2 release];[buttonArray release];//设置左按钮[leftButton addTarget:self action:@selector(requestStart:) forControlEvents:UIControlEventTouchUpInside];//最重要的一步，注意initWithCustomView方法。理论上左按钮可以是任意父类是UIView的控件.UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:leftButton];self.navigationItem.leftBarButtonItem = backItem;[backItem release];//设者导航栏的颜色self.navigationController.navigationBar.tintColor = [UIColor orangeColor];}- (void)viewDidUnload{[super viewDidUnload];// Release any retained subviews of the main view.// e.g. self.myOutlet = nil;self.titleLabel = nil;self.titleButton = nil;self.leftButton = nil;self.testButton = nil;self.indicator = nil;}- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{return (interfaceOrientation == UIInterfaceOrientationPortrait);}- (IBAction)requestStart:(id)sender{[self startIndicator];//业务逻辑实现}- (IBAction)requestStop:(id)sender{[self stopIndicator];//业务逻辑实现}- (void)startIndicator{self.navigationItem.leftBarButtonItem = nil;UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:indicator];self.navigationItem.leftBarButtonItem = backItem;[backItem release];}- (void)stopIndicator{self.navigationItem.leftBarButtonItem = nil;UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:leftButton];self.navigationItem.leftBarButtonItem = backItem;[backItem release];}@end
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『 不可能 』只存在於蠢人的字典里
