自定义 UINavigationItem 的简单实现

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