iOS:导航栏的工具条和导航条

功能：用NAV视图控制器打开新的视图，默认工具条和导航条隐藏，双击显示之

//
//  main.m
//  Hello
//
//  Created by lishujun on 14-8-28.
//  Copyright (c) 2014年 lishujun. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface TestViewController : UIViewController
@end

@implementation TestViewController
-(void) loadView
{
    NSLog(@"load View");
    //创建视图对象
    UIView *contentView = [[UIView alloc]initWithFrame:[[UIScreen mainScreen] applicationFrame]];
    contentView.backgroundColor = [UIColor lightGrayColor];
    self.view = contentView;
}
@end

// --------------视图控制器对象--------------
@interface HelloWorldViewController : UIViewController
{
    UIToolbar *toolBar;
}
@end

@implementation HelloWorldViewController

-(void) loadView
{
    NSLog(@"load View");
    //创建视图对象
    UIView *contentView = [[UIView alloc]initWithFrame:[[UIScreen mainScreen] applicationFrame]];
    contentView.backgroundColor = [UIColor lightGrayColor];
    self.view = contentView;

    //设置工具栏并显示
    [self setNavBarAndShow];
    [self setUserToolBarAndShow];
}

//-----------设置导航栏并显示-----------------
-(void) setNavBarAndShow
{
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Next" style:UIBarButtonItemStylePlain target:self action:@selector(pushView:)];
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Prev" style:UIBarButtonItemStylePlain target:self action:@selector(popView:)];
    [self.navigationController setNavigationBarHidden:NO]; // 显示之前隐藏的导航栏
}

-(void) pushView:(id)sender
{
    NSLog(@"push view");
    [self.navigationController pushViewController:[[TestViewController alloc]init] animated:YES];
}

-(void) popView:(id)sender
{
    NSLog(@"pop view");
    [self.navigationController popViewControllerAnimated:YES];
}

//------------设置工具栏并显示--------------
-(void) setNavToolBarAndShow
{
    // 设置NavigationController上的工具栏并显示
    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]];

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

-(void) setUserToolBarAndShow
{
    //设置自定义的toolbal
    [self.navigationController  setToolbarHidden:YES animated:YES];

    UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:nil action:nil];
    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];
}

@end

// ----------------委托对象--------------------
@interface HelloWorldAppDelegate : NSObject <UIApplicationDelegate>
{
    IBOutlet UIWindow *window;
}

@property (nonatomic, retain) UIWindow *window;
@property (nonatomic, retain) UINavigationController *nav;

@end

@implementation HelloWorldAppDelegate

@synthesize window;
@synthesize nav;

-(void) applicationDidFinishLaunching:(UIApplication *)application
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen]bounds]];
    HelloWorldViewController *viewController = [[HelloWorldViewController alloc]init];

    self.nav = [[UINavigationController alloc]initWithRootViewController: viewController];
    [self.nav setNavigationBarHidden:YES];        //隐藏导航栏，位于视图顶部
    [self.nav setToolbarHidden:YES];              //隐藏工具栏，位于视图底部

    self.window.rootViewController = self.nav;
    [self.window makeKeyAndVisible];
}
@end

// ---------------程序入口---------------------
int main(int argc, char * argv[])
{
    @autoreleasepool {
        return UIApplicationMain(argc, argv, nil, @"HelloWorldAppDelegate");
    }
}