将项添加到NavigationBar（不使用UINavigationController）

Question

我有一个带有UITableView的UIViewController，还添加了一个UINavigationBar。 如何以编程方式在该栏中添加和“编辑”按钮和“+”按钮？ （我尝试过使用IB，但标题总是被替换，而不是添加其他项目）我没有使用UINavigationController。 是我的UIViewController独自站立。

这是我尝试过没有成功的：

UIBarButtonItem *barButton = 
    [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonItemStyleBordered 
                                                  target:nil
                                                  action:nil];
UINavigationItem *editItem = [[UINavigationItem alloc] initWithTitle:@"Title"];
[editItem setLeftBarButtonItem:barButton animated:YES];
[navigationBar setItems:[NSArray arrayWithObject:editItem] animated:YES];

Answer 1

您的UIViewController具有navigationItem属性。 您可以使用self.navigationItem.leftBarButtonItem = ...和self.navigationItem.rightBarButtonItem = ...设置左右栏按钮项目self.navigationItem.rightBarButtonItem = ...

编辑：

好的，我假设您有对UINavigationBar的引用？ 然后我猜你要为它添加一个UINavigationItem ：

UINavigationItem *item = [[UINavigationItem alloc] initWithTitle:@"A Title"];
theNavigationBar.items = [NSArray arrayWithObject:item];
[item release]; // or keep this as an instance variable

然后设置该项的左右按钮：

theNavigationBar.topItem.leftBarButtonItem = ...;
theNavigationBar.topItem.rightBarButtonItem = ...;

我没有试过这个，但我认为它应该有效。

Answer 2

UIBarButtonItem *leftBarButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self action:@selector(theEditMethod:)];      
[viewController.navigationItem setLeftBarButtonItem:leftBarButton animated:NO];
[leftBarButton release];

UIBarButtonItem *rightBarButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(theAddMethod:)];       
[viewController.navigationItem setLeftBarButtonItem:rightBarButton animated:NO];
[rightBarButton release];

Answer 3

哟不需要将UINavigationItem添加到UINavigationBar。 哟可以这样做：

NSString *backButtonTittle=[NSString stringWithFormat:@"< %@",NSLocalizedString(@"backButton", nil)];
UIBarButtonItem *backCreateAccountNavBarItem=[[UIBarButtonItem alloc]initWithTitle:backButtonTittle style:UIBarButtonItemStylePlain target:self action:@selector(goToBackStep)];
self.createAccountNavBar.topItem.leftBarButtonItem=backCreateAccountNavBarItem;

Answer 4

只需使用viewController的navigationItem属性即可。

像这样：

 self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:self action:@selector(updateContent)];

Answer 5

导航栏项目/按钮，在Swift 4.2，ios 11，XCode 10上执行操作

1）使用Storyboard转到编辑器>嵌入> 导航栏

2）在AppDelegate> didFinishLaunchingWithOptions中 ：

UINavigationBar.appearance().barTintColor = UIColor(hexString: "1C9B90")
UINavigationBar.appearance().tintColor = UIColor.white
UINavigationBar.appearance().titleTextAttributes = [NSAttributedString.Key.foregroundColor : UIColor.white]

3）在viewcontroller的viewDidLoad上 ，创建按钮并添加到导航栏：

self.navigationController?.navigationBar.topItem?.title = "Title"
self.navigationController?.isNavigationBarHidden = false

//QR Code button
let qrCodeScanButton = UIButton(type: .custom)
qrCodeScanButton.setImage(UIImage(named: "camera"), for: .normal)
qrCodeScanButton.addTarget(self, action: #selector(self.searchWithQRCode), for: .touchUpInside)
let qrCodeScanButtonItem = UIBarButtonItem(customView: qrCodeScanButton)

///LogOut button
let logoutButton = UIButton(type: .custom)
logoutButton.setImage(UIImage(named: "logOut"), for: .normal)
logoutButton.addTarget(self, action: #selector(self.logOut), for: .touchUpInside)
let logoutButtonItem = UIBarButtonItem(customView: logoutButton)

self.navigationController?.navigationBar.topItem?.setRightBarButtonItems([logoutButtonItem, qrCodeScanButtonItem], animated: true)

4）按钮的动作：

@objc func logout(){
     ///present your Login VC
}

@objc func qrCodeScanButton(){
     ///present your Login VC
}

5）构建和运行

PS。 请记住这两个不同之处。

isNavigationBarHidden ：一个布尔值，指示导航栏是否隐藏。

self.navigationController?.isNavigationBarHidden

navigationBar.isHidden ：导航控制器管理的导航栏。

self.navigationController?.navigationBar.isHidden