UI3_UIbarButtonItem

//
//  AppDelegate.m
//  UI3_UIbarButtonItem
//
//  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
//  UI3_UIbarButtonItem
//
//  Created by zhangxueming on 15/7/6.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "ViewController.h"
#import "SecondViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.view.backgroundColor = [UIColor cyanColor];
    //每一个ViewController都对应一个NavigationItem对象
    //设置标题
    self.navigationItem.title = @"导航控制器";
    //设置 self.title 默认把title的值赋值给navigationItem.title
    self.title = @"导航导航";

    NSLog(@"%@", self.navigationItem.title);

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
    btn.frame = CGRectMake(100, 200, self.view.frame.size.width-200, 50);
    [btn setTitle:@"点击" forState:UIControlStateNormal];
    btn.titleLabel.font = [UIFont boldSystemFontOfSize:24];
    [btn addTarget:self action:@selector(btnClicked) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];

}

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

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

@end

//
//  SecondViewController.m
//  UI3_UIbarButtonItem
//
//  Created by zhangxueming on 15/7/6.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "SecondViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    NSLog(@"bar = %@", self.navigationController.navigationBar);
}

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

    self.navigationItem.title = @"SecondView";
    //设置提白后, navigationBar 的高度变为74
    self.navigationItem.prompt = @"提白";

    //设置标题视图

    UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"musicTitle"]];
    //设置标题视图 orgin坐标无效
    imageView.frame = CGRectMake(0, 0, 20, 30);
    self.navigationItem.titleView = imageView;
    NSLog(@"imageView = %@", self.navigationItem.titleView);

    self.navigationItem.backBarButtonItem.title = @"返回";
    NSLog(@"title = %@", self.navigationItem.backBarButtonItem.title);

    //初始化标题
    UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStylePlain target:self action:@selector(backButtonClicked)];
    self.navigationItem.leftBarButtonItem = backButton;
    //使用系统提供的样式
    UIBarButtonItem *systemBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action:@selector(systemBtnClicked)];
    self.navigationItem.rightBarButtonItem = systemBtn;
    //自定义UIBarButtonItem
    UIButton *customBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    [customBtn setBackgroundImage:[UIImage imageNamed:@"customImage@2x"] forState:UIControlStateNormal];
    customBtn.frame = CGRectMake(0, 0, 22, 22);
    [customBtn addTarget:self action:@selector(customBtnClicked) forControlEvents:UIControlEventTouchUpInside];
    UIBarButtonItem *customBtnItem = [[UIBarButtonItem alloc] initWithCustomView:customBtn];

    NSArray *items = [NSArray arrayWithObjects:customBtnItem,systemBtn, nil];
    self.navigationItem.rightBarButtonItems = items;

    UIBarButtonItem *editBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self action:@selector(editBtnClicked)];
    NSArray *leftItems = [NSArray arrayWithObjects:backButton,editBtn, nil];
    self.navigationItem.leftBarButtonItems = leftItems;
}

- (void)editBtnClicked
{
    NSLog(@"编辑按钮被点击");
}

- (void)backButtonClicked
{
    [self.navigationController popViewControllerAnimated:YES];
}

- (void)systemBtnClicked
{
    NSLog(@"相机功能被点击");
}

- (void)customBtnClicked
{
    NSLog(@"自定义按钮被点击");
}

- (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