iOS开篇——UI之UINavigationController

把NavigationController设为根视图控制器

    FirstViewController * firstVC = [[FirstViewController alloc]init];
    
    
    UINavigationController * nc = [[UINavigationController alloc]initWithRootViewController:firstVC];
    
    _window.rootViewController = nc;

NavigationController之间的跳转

SecondViewController * secondVC = [[SecondViewController alloc]init];
    
    [self.navigationController pushViewController:secondVC animated:YES];
//压栈方式跳转
  [self.navigationController popViewControllerAnimated:YES];
//出栈方式返回

设置toolBar

    [self.navigationController setToolbarHidden:NO animated:YES];
    //toolBar自定制和navigationBar基本相同 可以参考bar的自定制
    //设置是否透明
    self.navigationController.toolbar.translucent = YES;
    //设置样式
    self.navigationController.toolbar.barStyle = UIBarStyleDefault;

设置NavigationBar

//加注释 导航条增高20
    self.navigationItem.prompt = @"这是一个注释";
    
    //设置titleView——>
    UIView *view =[[UIView alloc]initWithFrame:CGRectMake(100, 100, 300, 20)];
    view.backgroundColor = [UIColor redColor];
    
    [UIView animateWithDuration:3 delay:2 options:0 animations:^{
        view.backgroundColor = [UIColor yellowColor];
    } completion:nil];
    self.navigationItem.titleView = view;

    //设置导航条样式
    self.navigationBar.barStyle = UIBarStyleBlack;
    
    //设置是否透明
     self.navigationBar.translucent = NO;

创建BarButtonItem  

UIBarButtonItem * item1 = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:nil action:nil];
//系统样式

 UIButton * button = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 40, 30)];
    [button setTitle:@"返回" forState:UIControlStateNormal];
    [button setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    UIBarButtonItem * customItem = [[UIBarButtonItem alloc]initWithCustomView:button];
//自定义

//iOS7以后 用图片设置barButtonItem时 要用imageWithRenderingMode:设置一直显示图片原来色彩
    UIImage * image = [[UIImage imageNamed:@"1-1"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    
    UIBarButtonItem * customItem1  = [[UIBarButtonItem alloc]initWithImage:image style:UIBarButtonItemStyleDone target:nil action:nil];
//用图片来创建