Snail—UI学习之自定义导航栏NSNavigationController

首先新建一个RootViewController 再建一个FirstViewController

在RootViewController.m中写入

#import "WJJRootViewController.h"
#import "WJJFirstViewController.h"

@interface WJJRootViewController ()

@end

@implementation WJJRootViewController

- (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.
    self.view.backgroundColor = [UIColor grayColor];
    [self createMyNavigationBar];
}


- (void)createMyNavigationBar{
    //手机最上面的状态栏20像素 系统导航栏高度为44 所以一共64像素
    UIView * navigationBar = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 64)];
    navigationBar.backgroundColor = [UIColor redColor];
    [self.view addSubview:navigationBar];
    
    
    //定义一个按钮
    UIButton * pushButton = [UIButton buttonWithType:UIButtonTypeSystem];
    pushButton.frame = CGRectMake(self.view.frame.size.width- 10 - 50, 27, 50, 30);
    [pushButton setTitle:@"下一页" forState:UIControlStateNormal];
    [pushButton addTarget:self action:@selector(nextPage) forControlEvents:UIControlEventTouchUpInside];
    //把按钮放在自定义的导航栏上
    [navigationBar addSubview:pushButton];
}

- (void)nextPage{
    WJJFirstViewController * first = [[WJJFirstViewController alloc] init];
    [self.navigationController pushViewController:first animated:YES];
}


- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    //因为后面的界面有可能使用系统导航栏 会把此属性设置为NO不隐藏 所以有必要在这设置一下 以防万一
    self.navigationController.navigationBarHidden = YES;
}

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

@end

然后 在firstViewController.m 中写入

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

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    //设置系统导航栏不隐藏  使用系统导航栏
    self.navigationController.navigationBarHidden = NO;
}