在xcode中将图像添加到导航栏？

Question

我在xib中添加了导航栏和导航项。现在我需要在导航栏的左侧添加图像，但它没有被添加。 这是我正在处理的代码：

- (void)viewDidLoad
{
UIImage *image = [UIImage imageNamed: @"i_launcher.png"];
    UIImageView *imageView = [[UIImageView alloc] initWithImage: image];
    self.navigationItem.titleView = imageView;
    [imageView release];
}

我无法理解为什么没有添加图像。我该如何添加它？

Answer 1

看起来这是一个老问题，并且已接受答案。但是，我想补充一下：

至少在Xcode 5中，如果你正在使用故事板那么你可以通过将空视图拖到标题区域，然后将ImageView放在空视图中来将图像添加为navigationBar的标题

以下屏幕截图可让您了解它的外观：

Answer 2

@implementation UINavigationBar (CustomImage) -(void)drawRect:(CGRect)rect { 

     CGRect currentRect = CGRectMake(0,0,100,45); 
     UIImage *image = [UIImage imageNamed:@"ic_launcher.png"]; 
     [image drawInRect:currentRect]; 
} 
@end 

<强>更新

只需在viewDidLoad:方法中添加此代码..

self.navigationItem.titleView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"yourimage.png"]];
UIBarButtonItem * item = [[UIBarButtonItem alloc] initWithCustomView:[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"yourimage2.jpg"]]];    
self.navigationItem.rightBarButtonItem = item; 

如果你想在NavigationBar的背景中直接设置图像，那么使用下面的线...

[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"i_launcher.png"] forBarMetrics:UIBarMetricsDefault];

另见此链接how-to-add-a-customized-image-button-to-uinavigationbar-in-iphone-sdk

我希望这可以帮助你...

Answer 3

- (void)viewDidLoad

    {


       UIImage *image = [UIImage imageNamed:@"Your Image"];
       UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
       imageView.frame = CGRectMake(5, 10, 72, 19);
       [self.navViewController.navigationBar addSubview:imageView];
   }

Answer 4

如果要在导航栏中的特定点设置图像，则可以创建视图，然后在视图中添加图像，调整图像框，然后将此视图添加到导航栏。

UIView *view = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 44)];
UIImageView *image = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"Default.png"]];
[image setFrame:CGRectMake(0, 0, 44, 44)];
[view addSubview:image];
[self.navigationController.navigationBar addSubview:view];

如果您要从xib添加NavBar，那么只需让IBOutlet为UINavigationBar连接xib然后

[myNavigationBar addSubview:view];

Answer 5

For Swift 4:

override func viewDidAppear(_ animated: Bool) {
        // 1
        let nav = self.navigationController?.navigationBar

        // 2
        nav?.barStyle = UIBarStyle.black
        nav?.tintColor = UIColor.yellow

        // 3
        let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 40, height: 40))
        imageView.contentMode = .scaleAspectFit

        // 4
        let image = UIImage(named: "Apple_Swift_Logo")
        imageView.image = image

        // 5
        navigationItem.titleView = imageView
    }

Answer 6

尝试设置 imageView.frame 也请正确交叉检查图片已启动

UIImage *image = [UIImage imageNamed: @"i_launcher.png"];
UIImageView *imageView = [[UIImageView alloc] initWithImage: image];
imageView.frame.origin.x = 30.0; // You will have to find suitable values for the origin
imageView.frame.origin.y = 5.0;
self.navigationItem.titleView = imageView;
[imageView release];

Answer 7

您的代码看起来不错。但我不知道你为什么需要在xib中添加导航栏和项目。如果您创建自己的视图控制器派生自UIViewController，它包含导航栏。您可以尝试从xib中删除自己添加的导航栏和项目，看看发生了什么。

如果要在基于视图的应用程序的第一个视图上显示导航栏，则需要修改应用程序类代码，如下所示：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.viewController = [[TestViewController alloc] initWithNibName:@"TestViewController" bundle:nil];

    // REMOVE THIS LINE !!!!!!!!!!!!!
    //self.window.rootViewController = self.viewController;

    // ADD BELOW TWO LINES !!!!!!!!!!!!!!!!!!!!!!!
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:self.viewController];
    self.window.rootViewController = nav;

    [self.window makeKeyAndVisible];
    return YES;
}

我刚做了如下测试：

1. 创建一个新的基于单一视图的项目。
2. 无需任何修改即可运行。它将显示一个空屏幕。
3. 在application.m文件中修改didFinishLaunchingWithOptions（），如上所述。

4. 在viewcontroller.m中，添加以下行。

   - （无效）viewDidLoad中 {     [super viewDidLoad]; UIImageView * view = [[UIImageView alloc] initWithFrame：CGRectMake（0,0,30,30）]; view.image = [UIImage imageNamed：@“info.png”]; self.navigationItem.titleView = view; }

5. 现在再次运行。您将看到一个带有图像标题的导航栏。

Answer 8

我希望这会对你有所帮助。如果不起作用，请检查您的图像名称是否正确。

UIImage *yourimage = [UIImage imageNamed: @"i_launcher.png"];

UIButton *buttonBarButton = [ UIButton buttonWithType:UIButtonTypeCustom];
buttonBarButton.frame = CGRectMake(0, 0,yourimage.size.width,yourimage.size.height);
[buttonBarButton setBackgroundImage:yourimage forState:UIControlStateNormal];
[buttonBarButton addTarget:nil action:nil forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *buttonBarButtonItem = [[[UIBarButtonItem alloc]initWithCustomView:buttonBarButton] autorelease];
self.navigationItem.leftBarButtonItem = buttonBarButtonItem;

如果您希望添加操作意味着：

[buttonBarButton addTarget:self action:@selector(your function) forControlEvents:UIControlEventTouchUpInside];

Answer 9

隐藏/显示移动到另一个控制器之间的图像执行此操作。相应地调整CGRectMake尺寸。

将此添加到您的标题文件中：

@property (weak, nonatomic) UIImageView *navBarLogo;

将其添加到.m控制器文件中：

- (void)viewWillAppear:(BOOL)animated {

    UIImage *image = [UIImage imageNamed:@"image_name.png"];
    UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
    imageView.frame = CGRectMake(53, 7, 210, 30);

    self.navBarLogo = imageView;

    [self.navigationController.navigationBar addSubview:imageView];

}

- (void)viewWillDisappear:(BOOL)animated {

    [self.navigationController.navigationBar sendSubviewToBack:self.navBarLogo];
}