iOS 途中からUINavagationControllerを適用する。(Objective-C)

タイトル画面→遷移→UINavigationControllerのように途中からナビゲーションバーを出す。(ヘッダーファイルはいじってないので省略)

###ViewController.m

#import "ViewController.h"
#import "NextViewController.h"
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor grayColor];
    UILabel *label= [[UILabel alloc]initWithFrame:CGRectMake(CGRectGetMidX(self.view.bounds)-130, CGRectGetMidY(self.view.bounds)-20, 260, 40)];
    label.text = @"最初のビューコントローラーさん";
    label.textColor = [UIColor whiteColor];
    [self.view addSubview:label];
}

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    
    NextViewController *next = [[NextViewController alloc]init];
    [self presentViewController:next animated:YES completion:nil];
}
@end

###NextViewController.m

#import "NextViewController.h"
#import "ThirdViewController.h"

@interface NextViewController ()

@end

@implementation NextViewController

- (void)viewDidLoad {
    self.view.backgroundColor = [UIColor yellowColor];
    UILabel *label= [[UILabel alloc]initWithFrame:CGRectMake(CGRectGetMidX(self.view.bounds)-140, CGRectGetMidY(self.view.bounds)-20, 280, 40)];
    label.text = @"ネクストビューコントローラーさん";
    label.textColor = [UIColor blackColor];
    [self.view addSubview:label];
}

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    ThirdViewController *third = [[ThirdViewController alloc]init];
    UINavigationController *nv = [[UINavigationController alloc]initWithRootViewController:third];
    [self presentViewController:nv animated:YES completion:nil];
}

@end

###ThirdViewController.m

#import "ThirdViewController.h"

@interface ThirdViewController ()

@end

@implementation ThirdViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor greenColor];
    self.title = @"サードビューコントローラーさん";
    // Do any additional setup after loading the view.
}

@end