将按钮添加到 UINavigationController 子类

Question

我正在尝试创建UINavigationController 的可重用子类。所以这是我的代码：

    @interface MainNavigationController : UINavigationController
...
- (void)viewDidLoad {
    [super viewDidLoad];
    self.navigationBar.barTintColor = primaryOrange;
    self.navigationBar.tintColor = white;

    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"search"] style:UIBarButtonItemStylePlain target:self action:nil];
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"menu"] style:UIBarButtonItemStylePlain target:self action:nil];


}

所以问题是导航栏的颜色发生了变化，但按钮没有出现。
我在这里错过了什么？

更新 我想在我的图像中为 NavigationController 使用相同的 NavigationController（按钮和颜色......）：

更新 所以我以这种方式将我的 navugationController unn 子类化了：

-(void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated{
    viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"search"] style:UIBarButtonItemStylePlain target:self action:nil];
    viewController.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"menu"] style:UIBarButtonItemStylePlain target:self action:@selector(showMainMenu)];

}

- (id)initWithRootViewController:(UIViewController *)rootViewController {
    self = [super initWithRootViewController:rootViewController];
    if (self) {
        rootViewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"search"] style:UIBarButtonItemStylePlain target:self action:nil];
        rootViewController.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"menu"] style:UIBarButtonItemStylePlain target:self action:@selector(showMainMenu)];


    }
    return self;
}

这项工作，但唯一的问题是，当我按下视图而不是左侧有后退按钮时，我总是得到搜索图标，如何修复它（我希望左侧有父级的搜索按钮和返回按钮子视图）？

Answer 1

子类化设计应该是这样的——

- (id)initWithRootViewController:(UIViewController *)rootViewController {
    self = [super initWithRootViewController:rootViewController];
    if (self) {
        [self setLeftButtonToController:rootViewController];
    }
    return self;
}

- (void)setLeftButtonToController:(UIViewController *)viewController {
    UIBarButtonItem *closeItem = [[UIBarButtonItem alloc] initWithTitle:@"Close" style:UIBarButtonItemStylePlain target:self action:@selector(dismissController)];
    [viewController.navigationItem setRightBarButtonItem:closeItem];
}

根据要求提供完整代码 -

//
//  MyOwnNavigationController.h
// 
//


#import <UIKit/UIKit.h>

@interface MyOwnNavigationController : UINavigationController
- (id)initWithRootViewController:(UIViewController *)rootViewController;
@end



//
//  MyOwnNavigationController.m
// 
//


#import "MyOwnNavigationController.h"

@interface MyOwnNavigationController ()

@end

@implementation MyOwnNavigationController



- (id)initWithRootViewController:(UIViewController *)rootViewController {
    self = [super initWithRootViewController:rootViewController];
    if (self) {
        [self setLeftButtonToController:rootViewController];
    }
    return self;
}

- (void)setLeftButtonToController:(UIViewController *)viewController {
    UIBarButtonItem *closeItem = [[UIBarButtonItem alloc] initWithTitle:@"Close" style:UIBarButtonItemStylePlain target:self action:@selector(dismissController)];
    [viewController.navigationItem setRightBarButtonItem:closeItem];
}


@end

如何使用 -

TwoViewController * viewController = [[TwoViewController alloc] initWithNibName:@"TwoViewController" bundle:nil];
    MyOwnNavigationController *navController = [[MyOwnNavigationController alloc] initWithRootViewController:viewController];

更新为 StoryBroad ---- 将以下方法添加到 MyOwnNavigationController.m

- (void) loadView 
{
    UIBarButtonItem *closeItem = [[UIBarButtonItem alloc] initWithTitle:@"Close" style:UIBarButtonItemStylePlain target:self action:@selector(dismissController)];
        [self.rootViewController.navigationItem setRightBarButtonItem:closeItem];
}