UI2_UINavigationBar

//
//  AppDelegate.m
//  UI2_UINavigationBar
//
//  Created by zhangxueming on 15/7/6.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:self.window.rootViewController];
    self.window.rootViewController = nav;
    
    return YES;
}

//
//  ViewController.m
//  UI2_UINavigationBar
//
//  Created by zhangxueming on 15/7/6.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "ViewController.h"
#import "SubViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    //获取导航条(视图)
    //self.navigationController.navigationBar
    //导航条的高度是44(竖屏)
    //横屏模式高度是32
    NSLog(@"bar = %@", self.navigationController.navigationBar);
    NSLog(@"view = %@", self.view);
    
    //隐藏导航条
    self.navigationController.navigationBar.hidden = YES;
    
    //[self.navigationController setNavigationBarHidden:NO animated:NO];
}


- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    self.view.backgroundColor = [UIColor cyanColor];
    
    //设置背景图片
    //人像模式(竖屏) UIBarMetricsDefault,
    //风景模式(横屏) UIBarMetricsCompact
    
    //图片命名
    //普通  navigationBar.png
    //高分屏navigationBar@2x.png
    //设置了导航条的背景图片后, 对应的视图控制器的视图的高度被发生变化, 竖屏(0, 64) 横屏(0,32)
    
    self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
    
    self.navigationController.navigationBar.backgroundColor = [UIColor redColor];
    
    self.navigationController.navigationBar.tintColor = [UIColor redColor];
    
    
    [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"navigationBar@2x"] forBarMetrics:UIBarMetricsDefault];
    //横屏背景图片
    [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"navigationBarCompact@2x"] forBarMetrics:UIBarMetricsCompact];
    
    
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
    btn.frame = CGRectMake(100, 200, self.view.frame.size.width-200, 50);
    [btn setTitle:@"按钮" forState:UIControlStateNormal];
    btn.titleLabel.font = [UIFont boldSystemFontOfSize:24];
    [btn addTarget:self action:@selector(btnClicked) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
}

- (void)btnClicked
{
    SubViewController *svc= [[SubViewController alloc] init];
    [self.navigationController pushViewController:svc animated:YES];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

//
//  SubViewController.m
//  UI2_UINavigationBar
//
//  Created by zhangxueming on 15/7/6.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "SubViewController.h"

@interface SubViewController ()

@end

@implementation SubViewController

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    NSLog(@"bar = %@", self.navigationController.navigationBar);
    NSLog(@"view = %@", self.view);
    self.navigationController.navigationBar.hidden = NO;
    
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor= [UIColor yellowColor];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end