创建导航栏是 UISegmentedControl的控制器，通过点击切换控制器。
第一个控制器
第二个控制器
1.创建导航控制器为window的根控制器，设置ViewController为导航控制器的根控制器
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];
self.window.backgroundColor = [UIColor whiteColor];
UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:[ViewController new]];
self.window.rootViewController = nav;
[self.window makeKeyAndVisible];
return YES;
}
2.创建2个子控制器Controller1，Controller2
3.在ViewController中懒加载Controller1/Controller2，并设置导航栏，添加子控制器（控制器是父子关系，那么控制器的view也必须是父子关系）
@interface ViewController ()
@property (nonatomic, strong) Controller1 *one;
@property (nonatomic, strong) Controller2 *two;
@property (weak, nonatomic) UIViewController *showingVC;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self setupNav];
[self addChildViewController:self.one];
[self addChildViewController:self.two];
self.view.backgroundColor = [UIColor redColor];
self.automaticallyAdjustsScrollViewInsets = NO;
[self sengenmentDidClick:0];
}
// 切换之前要移除之前的view，否则同时有2个view
- (void)sengenmentDidClick:(UISegmentedControl *)segment {
[self.showingVC.view removeFromSuperview];
self.showingVC = self.childViewControllers[segment.selectedSegmentIndex];
[self.view addSubview:self.showingVC.view];
}
- (void)setupNav {
UISegmentedControl *sengement = [[UISegmentedControl alloc] initWithItems:@[@"ONE",@"TWO"]];
sengement.tintColor = [UIColor whiteColor];
sengement.selectedSegmentIndex = 0;
sengement.width = 160;
sengement.height = 29;
sengement.center = CGPointMake(SCREEN_WIDTH / 2, 75);
[sengement setTitleTextAttributes:
@{NSFontAttributeName : [UIFont systemFontOfSize:12],
NSForegroundColorAttributeName:ColorWithRGB(0xff, 0xff, 0xff),
NSBackgroundColorAttributeName:ColorWithRGB(0x12, 0x12, 0x12)}
forState:UIControlStateNormal];
[sengement setTitleTextAttributes:
@{NSFontAttributeName : [UIFont systemFontOfSize:12],
NSForegroundColorAttributeName:ColorWithRGB(0x33, 0x33, 0x33),
NSBackgroundColorAttributeName:[UIColor whiteColor]}
forState:UIControlStateSelected];
[sengement addTarget:self action:@selector(sengenmentDidClick:) forControlEvents:UIControlEventValueChanged];
self.navigationItem.titleView = sengement;
}
- (Controller1 *)one {
if (!_one) {
self.one = [[Controller1 alloc] init];
self.one.view.frame = CGRectMake(0, 64, SCREEN_WIDTH, SCREEN_HEIGHT);
}
return _one;
}
- (Controller2 *)two {
if (!_two) {
self.two = [[Controller2 alloc] init];
self.two.view.frame = CGRectMake(0, 64, SCREEN_WIDTH, SCREEN_HEIGHT);
}
return _two;
}
@end
