如何快速在標簽欄項目中設置圖像？

Question

我采用了一個視圖控制器並將其嵌入到導航控制器中，並且再次將其嵌入到選項卡欄控制器中。 當我嘗試通過故事板設置圖像時，圖像沒有出現在標簽欄圖標上。這里的圖像名稱是 25。

請建議我我能做什么？ 我怎樣才能以編程方式做到這一點？ 為此，我應該采用什么合適的圖像尺寸？ 提前致謝。

Answer 1

在你的 MainTabbarViewController

綁定標簽欄的出口：

@IBOutlet weak var myTabBar: UITabBar?

 override func viewDidLoad() {
      super.viewDidLoad()

      myTabBar?.tintColor = UIColor.white
      tabBarItem.title = ""

      setTabBarItems()

 }

在這里設置標簽欄項目定義的方法如下：

func setTabBarItems(){

      let myTabBarItem1 = (self.tabBar.items?[0])! as UITabBarItem
      myTabBarItem1.image = UIImage(named: "Unselected")?.withRenderingMode(UIImageRenderingMode.alwaysOriginal)
      myTabBarItem1.selectedImage = UIImage(named: "Selected ")?.withRenderingMode(UIImageRenderingMode.alwaysOriginal)
      myTabBarItem1.title = ""
      myTabBarItem1.imageInsets = UIEdgeInsets(top: 6, left: 0, bottom: -6, right: 0)

      let myTabBarItem2 = (self.tabBar.items?[1])! as UITabBarItem
      myTabBarItem2.image = UIImage(named: "Unselected")?.withRenderingMode(UIImageRenderingMode.alwaysOriginal)
      myTabBarItem2.selectedImage = UIImage(named: "Selected")?.withRenderingMode(UIImageRenderingMode.alwaysOriginal)
      myTabBarItem2.title = ""
      myTabBarItem2.imageInsets = UIEdgeInsets(top: 6, left: 0, bottom: -6, right: 0)


      let myTabBarItem3 = (self.tabBar.items?[2])! as UITabBarItem
      myTabBarItem3.image = UIImage(named: "Unselected")?.withRenderingMode(UIImageRenderingMode.alwaysOriginal)
      myTabBarItem3.selectedImage = UIImage(named: "Selected")?.withRenderingMode(UIImageRenderingMode.alwaysOriginal)
      myTabBarItem3.title = ""
      myTabBarItem3.imageInsets = UIEdgeInsets(top: 6, left: 0, bottom: -6, right: 0)

      let myTabBarItem4 = (self.tabBar.items?[3])! as UITabBarItem
      myTabBarItem4.image = UIImage(named: "Unselected")?.withRenderingMode(UIImageRenderingMode.alwaysOriginal)
      myTabBarItem4.selectedImage = UIImage(named: "Selected")?.withRenderingMode(UIImageRenderingMode.alwaysOriginal)
      myTabBarItem4.title = ""
      myTabBarItem4.imageInsets = UIEdgeInsets(top: 6, left: 0, bottom: -6, right: 0)

 }

干杯！

Answer 2

添加 AppDelegate 類：

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool
{
    window=UIWindow(frame: UIScreen.main.bounds)
    self.window?.rootViewController = setTabbar()
    self.window?.makeKeyAndVisible()
    window?.backgroundColor=UIColor.white
    return true
}

func setTabbar() -> UITabBarController
{
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let tabbarcntrl = UITabBarController()

    let Home = storyboard.instantiateViewController(withIdentifier: "HomeView") // 1st tab bar viewcontroller
    let Followed = storyboard.instantiateViewController(withIdentifier: "FollowedView") // 2nd tab bar viewcontroller
    let Message = storyboard.instantiateViewController(withIdentifier: "MessageView") // 3rd tab bar viewcontroller

    // all viewcontroller embedded navigationbar
    let nvHome = UINavigationController(rootViewController: Home)
    let nvFollowed = UINavigationController(rootViewController: Followed)
    let nvMessage = UINavigationController(rootViewController: Message)

    // all viewcontroller navigationbar hidden
    nvHome.setNavigationBarHidden(true, animated: false)
    nvFollowed.setNavigationBarHidden(true, animated: false)
    nvMessage.setNavigationBarHidden(true, animated: false)

    tabbarcntrl.viewControllers = [nvHome,nvFollowed,nvMessage]

    let tabbar = tabbarcntrl.tabBar
    tabbar.barTintColor = UIColor.black
    tabbar.backgroundColor = UIColor.black
    tabbar.tintColor = UIColor(red: 43/255, green: 180/255, blue: 0/255, alpha: 1)

    //UITabBar.appearance().tintColor = UIColor.white
    let attributes = [NSFontAttributeName:UIFont(name: "Montserrat-Light", size: 10)!,NSForegroundColorAttributeName:UIColor.white]
    let attributes1 = [NSFontAttributeName:UIFont(name: "Montserrat-Light", size: 10)!,NSForegroundColorAttributeName:UIColor(red: 43/255, green: 180/255, blue: 0/255, alpha: 1)]

    UITabBarItem.appearance().setTitleTextAttributes(attributes, for: .normal)
    UITabBarItem.appearance().setTitleTextAttributes(attributes1, for: .selected)


    let tabHome = tabbar.items![0]
    tabHome.title = "Home" // tabbar titlee
    tabHome.image=UIImage(named: "icon_home.png")?.withRenderingMode(.alwaysOriginal) // deselect image
    tabHome.selectedImage = UIImage(named: "icon_home.png")?.withRenderingMode(.alwaysOriginal) // select image
    tabHome.titlePositionAdjustment.vertical = tabHome.titlePositionAdjustment.vertical-4 // title position change

    let tabFoll = tabbar.items![1]
    tabFoll.title = "Followed"
    tabFoll.image=UIImage(named: "icon_fold.png")?.withRenderingMode(.alwaysOriginal)
    tabFoll.selectedImage=UIImage(named: "icon_fold.png")?.withRenderingMode(.alwaysOriginal)
    tabFoll.titlePositionAdjustment.vertical = tabFoll.titlePositionAdjustment.vertical-4

    let tabMsg = tabbar.items![3]
    tabMsg.title = "Message"
    tabMsg.image=UIImage(named: "icon_mail.png")?.withRenderingMode(.alwaysOriginal)
    tabMsg.selectedImage=UIImage(named: "icon_mail.png")?.withRenderingMode(.alwaysOriginal)
    tabMsg.titlePositionAdjustment.vertical = tabMsg.titlePositionAdjustment.vertical-4

    return tabbarcntrl
}

Answer 3

設置兩個圖像 - 用於選擇/選擇狀態

Answer 4

您正在以正確的方式做所有事情但唯一的問題是您的 tabbaritem 圖像大小不正確。只需查看此表即可了解 tabbaritem 圖像的實際大小。

Answer 5

在 swift 4 和 5 中，您可以使用以下擴展名。 記住一件事總是傳遞相同數量的圖像，選定的圖像和標題，但如果您不想設置標題，則在標題中傳遞 nil。

extension UITabBarController{        
        func setUpImagaOntabbar(_ selectedImage : [UIImage], _ image : [UIImage], _ title : [String]?){
            
            for (index,vals) in image.enumerated(){
                
                if let tab = self.tabBar.items?[index]{
                    
                    tab.image = image[index]
                    tab.image = selectedImage[index]
                    if let tile = title[index]{
                       tab.title = title[index]
                      }
                    
                }
            }
        }
    }