Ios 以编程方式将按钮添加到UINavigationController

我认为这应该是一个简单的问题，但我还是挠头。我有一个应用程序，在情节提要中设置了多个ViewController。我希望每个视图的顶部都有相同的导航栏，但是这个导航控制器在所有视图上都有相同的按钮。导航控制器在AppDelegate中设置，按钮添加到每个ViewController的ViewDidLoad中（根据我在这里收到的另一个问题的答案），但目前，按钮（和标题）没有显示

其中设置了UINavigationController-AppDelegate.m：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

    UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle: nil];
    MainViewController* mainVC = [mainStoryboard instantiateInitialViewController];
    UINavigationController *navVC = [[UINavigationController alloc] initWithRootViewController:mainVC];

    [self.window setRootViewController:navVC];

    [_window makeKeyAndVisible];

    return YES;
}

其中一个观点是：

- (void)viewDidLoad
{

    [self setTitle:@"Congress app"];  // < This does not set the title of the NavController

    UIBarButtonItem *showSettingsButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(showSettings:)];
    UIBarButtonItem *showMenuButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"menuButton.png"] style:UIBarButtonItemStylePlain target:self action:@selector(revealMenu:)];

    //self.navigationItem.leftBarButtonItem = showMenuButton;
    //self.navigationItem.rightBarButtonItem = showSettingsButton;
    self.navigationController.navigationItem.leftBarButtonItem = showMenuButton;
    self.navigationController.navigationItem.rightBarButtonItem = showSettingsButton;

    UINavigationController *currentNav;
    UIViewController *VCname;   
    NSLog(@"First left button in navigation controller - %@", [self.navigationController.navigationItem.leftBarButtonItems objectAtIndex:0]);
    NSLog(@"First right button in navigation controller - %@", [self.navigationController.navigationItem.rightBarButtonItems objectAtIndex:0]);
    [super viewDidLoad];  
}

这可能是问题的原因

编辑2：

多亏了Saurav Mac，我才发现问题出在试图在“错误”的视图控制器上添加按钮。我在AppDelegate.m中设置了导航控制器，第一个视图控制器是InitViewController，然后调用MainViewController作为“俯视控制器”。真不敢相信我错过了，谢谢你的帮助

self.navigationController.navigationItem.leftBarButtonItem = showMenuButton;
self.navigationController.navigationItem.rightBarButtonItem = showSettingsButton;

换成

self.navigationItem.leftBarButtonItem = showMenuButton;
self.navigationItem.rightBarButtonItem = showSettingsButton;

换成

self.navigationItem.leftBarButtonItem = showMenuButton;
self.navigationItem.rightBarButtonItem = showSettingsButton;

---

您可以在一个公共类（即NSObject的子类）中创建此按钮，然后在要添加按钮的每个类中调用此方法，也可以将此代码添加到每个类的ViewDidLoad方法中-

self.navigationItem.leftBarButtonItem=[[UIBarButtonItem alloc]init];

UIImage *img1=[UIImage imageNamed:@"image.png"];
CGRect frameimg1 = CGRectMake(0, 0, img1.size.width, img1.size.height);
UIButton *signOut=[[UIButton alloc]initWithFrame:frameimg1];
[signOut setBackgroundImage:img1 forState:UIControlStateNormal];
[signOut addTarget:self action:@selector(BackButtonPressed)
  forControlEvents:UIControlEventTouchUpInside];
[signOut setShowsTouchWhenHighlighted:YES];

UIBarButtonItem *barButton=[[UIBarButtonItem alloc]initWithCustomView:signOut];
self.navigationItem.leftBarButtonItem=barButton;

---

您可以在一个公共类（即NSObject的子类）中创建此按钮，然后在要添加按钮的每个类中调用此方法，也可以将此代码添加到每个类的ViewDidLoad方法中-

self.navigationItem.leftBarButtonItem=[[UIBarButtonItem alloc]init];

UIImage *img1=[UIImage imageNamed:@"image.png"];
CGRect frameimg1 = CGRectMake(0, 0, img1.size.width, img1.size.height);
UIButton *signOut=[[UIButton alloc]initWithFrame:frameimg1];
[signOut setBackgroundImage:img1 forState:UIControlStateNormal];
[signOut addTarget:self action:@selector(BackButtonPressed)
  forControlEvents:UIControlEventTouchUpInside];
[signOut setShowsTouchWhenHighlighted:YES];

UIBarButtonItem *barButton=[[UIBarButtonItem alloc]initWithCustomView:signOut];
self.navigationItem.leftBarButtonItem=barButton;

试试这个：

显示导航控制器的左按钮图标：

    UIImage *faceImage = [UIImage imageNamed:@"back_arrow.png"];
    UIButton *face = [UIButton buttonWithType:UIButtonTypeCustom];
    face.bounds = CGRectMake( 10, 0, faceImage.size.width, faceImage.size.height );
    [face addTarget:self action:@selector(handleBack:) forControlEvents:UIControlEventTouchUpInside];
    [face setImage:faceImage forState:UIControlStateNormal];
    UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithCustomView:face];
    self.navigationItem.leftBarButtonItem = backButton;
    [self.navigationItem setHidesBackButton:YES animated:YES];
    [self.navigationItem setLeftBarButtonItem:nil animated:NO];
    [self.navigationItem setBackBarButtonItem:nil];

UIImage *faceImage1= [UIImage imageNamed:@"slideshowarrow"];
UIButton *face1 = [UIButton buttonWithType:UIButtonTypeCustom];
face1.bounds = CGRectMake( 10, 0, faceImage1.size.width, faceImage1.size.height );
[face1 addTarget:self action:@selector(Goto_nextView) forControlEvents:UIControlEventTouchUpInside];
[face1 setImage:faceImage1 forState:UIControlStateNormal];
UIBarButtonItem *backButton1 = [[UIBarButtonItem alloc] initWithCustomView:face1];
self.navigationItem.rightBarButtonItem = backButton1;

显示导航控制器的右按钮图标：

    UIImage *faceImage = [UIImage imageNamed:@"back_arrow.png"];
    UIButton *face = [UIButton buttonWithType:UIButtonTypeCustom];
    face.bounds = CGRectMake( 10, 0, faceImage.size.width, faceImage.size.height );
    [face addTarget:self action:@selector(handleBack:) forControlEvents:UIControlEventTouchUpInside];
    [face setImage:faceImage forState:UIControlStateNormal];
    UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithCustomView:face];
    self.navigationItem.leftBarButtonItem = backButton;
    [self.navigationItem setHidesBackButton:YES animated:YES];
    [self.navigationItem setLeftBarButtonItem:nil animated:NO];
    [self.navigationItem setBackBarButtonItem:nil];

UIImage *faceImage1= [UIImage imageNamed:@"slideshowarrow"];
UIButton *face1 = [UIButton buttonWithType:UIButtonTypeCustom];
face1.bounds = CGRectMake( 10, 0, faceImage1.size.width, faceImage1.size.height );
[face1 addTarget:self action:@selector(Goto_nextView) forControlEvents:UIControlEventTouchUpInside];
[face1 setImage:faceImage1 forState:UIControlStateNormal];
UIBarButtonItem *backButton1 = [[UIBarButtonItem alloc] initWithCustomView:face1];
self.navigationItem.rightBarButtonItem = backButton1;

可能会对你有帮助。

试试这个：

显示导航控制器的左按钮图标：

    UIImage *faceImage = [UIImage imageNamed:@"back_arrow.png"];
    UIButton *face = [UIButton buttonWithType:UIButtonTypeCustom];
    face.bounds = CGRectMake( 10, 0, faceImage.size.width, faceImage.size.height );
    [face addTarget:self action:@selector(handleBack:) forControlEvents:UIControlEventTouchUpInside];
    [face setImage:faceImage forState:UIControlStateNormal];
    UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithCustomView:face];
    self.navigationItem.leftBarButtonItem = backButton;
    [self.navigationItem setHidesBackButton:YES animated:YES];
    [self.navigationItem setLeftBarButtonItem:nil animated:NO];
    [self.navigationItem setBackBarButtonItem:nil];

UIImage *faceImage1= [UIImage imageNamed:@"slideshowarrow"];
UIButton *face1 = [UIButton buttonWithType:UIButtonTypeCustom];
face1.bounds = CGRectMake( 10, 0, faceImage1.size.width, faceImage1.size.height );
[face1 addTarget:self action:@selector(Goto_nextView) forControlEvents:UIControlEventTouchUpInside];
[face1 setImage:faceImage1 forState:UIControlStateNormal];
UIBarButtonItem *backButton1 = [[UIBarButtonItem alloc] initWithCustomView:face1];
self.navigationItem.rightBarButtonItem = backButton1;

显示导航控制器的右按钮图标：

    UIImage *faceImage = [UIImage imageNamed:@"back_arrow.png"];
    UIButton *face = [UIButton buttonWithType:UIButtonTypeCustom];
    face.bounds = CGRectMake( 10, 0, faceImage.size.width, faceImage.size.height );
    [face addTarget:self action:@selector(handleBack:) forControlEvents:UIControlEventTouchUpInside];
    [face setImage:faceImage forState:UIControlStateNormal];
    UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithCustomView:face];
    self.navigationItem.leftBarButtonItem = backButton;
    [self.navigationItem setHidesBackButton:YES animated:YES];
    [self.navigationItem setLeftBarButtonItem:nil animated:NO];
    [self.navigationItem setBackBarButtonItem:nil];

UIImage *faceImage1= [UIImage imageNamed:@"slideshowarrow"];
UIButton *face1 = [UIButton buttonWithType:UIButtonTypeCustom];
face1.bounds = CGRectMake( 10, 0, faceImage1.size.width, faceImage1.size.height );
[face1 addTarget:self action:@selector(Goto_nextView) forControlEvents:UIControlEventTouchUpInside];
[face1 setImage:faceImage1 forState:UIControlStateNormal];
UIBarButtonItem *backButton1 = [[UIBarButtonItem alloc] initWithCustomView:face1];
self.navigationItem.rightBarButtonItem = backButton1;

可能对你有帮助。

请试试这个

- (void)viewDidLoad
{

     [super viewDidLoad];

     CGRect frameimgback1 = CGRectMake(0, 0, 60, 35);
     UIButton *button = [[UIButton alloc] initWithFrame:frameimgback1];
     [button addTarget:self action:@selector(back)  forControlEvents:UIControlEventTouchUpInside];
     [button setTitle:@"Ravindra" forState:UIControlStateNormal];
     UIBarButtonItem *btnL = [[UIBarButtonItem alloc] initWithCustomView:button];
     self.navigationItem.leftBarButtonItem = btnL;
}

请试试这个

- (void)viewDidLoad
{

     [super viewDidLoad];

     CGRect frameimgback1 = CGRectMake(0, 0, 60, 35);
     UIButton *button = [[UIButton alloc] initWithFrame:frameimgback1];
     [button addTarget:self action:@selector(back)  forControlEvents:UIControlEventTouchUpInside];
     [button setTitle:@"Ravindra" forState:UIControlStateNormal];
     UIBarButtonItem *btnL = [[UIBarButtonItem alloc] initWithCustomView:button];
     self.navigationItem.leftBarButtonItem = btnL;
}

---

---

我尝试过这个（你可以在我的代码中看到它被注释掉了），但是按钮仍然不显示。我尝试过这个（你可以在我的代码中看到它被注释掉了），但是按钮仍然不显示。这似乎也不起作用，我已将“image.png”更改为我用于其他用途的图像，但仍然没有显示。请仔细检查您使用的图像是否为png格式，并且图像名称应为双引号。我使用的是：“menuButton.png”。还有，为什么标题不显示？我想是出了什么问题，停止了标题和按钮的显示。那么你的导航栏一定有问题。仔细跟踪你的导航栏，你是如何为那个特定的视图分配它的。你能把你正在使用的代码发送到alloc bar按钮上吗？这似乎也不起作用，我已将“image.png”更改为我用于其他用途的图像，但仍然没有显示。请仔细检查您使用的图像是否为png格式，并且图像名称应为双引号。我使用的是：“menuButton.png”。还有，为什么标题不显示？我想是出了什么问题，停止了标题和按钮的显示。那么你的导航栏一定有问题。仔细跟踪您的导航栏，您是如何为该特定视图分配的。请将您正在使用的代码发送到alloc bar按钮。请仔细观察代码。以下方法有更改：1）-（BOOL）应用程序：（UIApplication*）应用程序完成启动时使用选项：（NSDictionary*）启动选项2）-（无效）ViewDidLoad我已将此代码复制到我的上，但仍然无法工作。我连标题都拿不出来。嘿，瑞安。你有什么解决办法吗？嗨，是的，我最后有。请参阅问题中的我的编辑-这取决于另一个视图控制器中分配的导航控制器。请仔细观察代码..以下方法有更改：1）-（BOOL）应用程序：（UIApplication*）应用程序did完成启动WithOptions:（NSDictionary*）启动选项2）-（void）VIEWDIDLOAD我已经将此代码复制到我的代码上，但它仍然不起作用。我连标题都拿不出来。嘿，瑞安。你有什么解决办法吗？嗨，是的，我最后有。请参阅问题中的我的编辑-这取决于另一个视图控制器中分配的导航控制器。您是否删除了

项目设置>#目标#>部署信息>主界面

上的“Main”[您的故事板名称]（因为您正在手动管理初始控制器）？Dude让我们回到基础，你是否尝试过先添加一个普通的按钮，而不是尝试在图像中添加一个按钮？首先让我知道这是否有效：）@Pavan-我刚刚尝试过：[self.navigationItem setLeftBarButtonItem:[[UIBarButtonItem alloc]initWithTitle:@“Title”样式：UIBarButtonItemStylePlain目标：无操作：@selector（showSettings:）]动画：是]；仍然不走运…请检查此操作可能会解决您的问题您是否删除了

项目设置>#目标#>部署信息>主界面上的“主”[故事板名称]（因为您正在手动管理初始控制器）

？Dude让我们回到基本问题，您是否尝试先添加一个普通的barbuttonitem，而不是尝试在图像中添加按钮？首先让我知道这是否有效：）@Pavan-我刚刚尝试过：[self.navigationItem setLeftBarButtonItem:[[UIBarButtonItem alloc]initWithTitle:@“Title”样式：UIBarButtonItemStylePlain目标：无操作：@selector（showSettings:）]动画：是]；仍然不走运…请检查此项可能会解决您的问题这对我不起作用，就像其他答案一样，我可以看到导航栏，但它是空的-甚至没有标题。@Ryan FYI它显示的是btn（左/右）而不是导航标题或者我似乎一开始就犯了一个巨大的错误，您发布的代码还可以，但我的程序