在我的應用程序中創建自定義後退按鈕

我試圖改變我的應用程序中導航控制器後退按鈕的默認外觀。在我的應用程序中創建自定義後退按鈕

我想使用圖像（圖標）並刪除「返回」文本。此代碼在整個按鈕上拉伸圖像並且不刪除按鈕標題。

let backImg: UIImage = UIImage(named: "icon_back")! 
UIBarButtonItem.appearance().setBackButtonBackgroundImage(backImg, for: .normal, barMetrics: .default)

的建議是如何做的是內部的AppDelegate（didFinishLaunchingWithOptions）？

來源

2017-08-08 Sanae Ariuop

用它創建UIViewController的基類子類。 –

@ElTomato你能解釋一下嗎？感謝您的幫助。 –

簡單的做法是爲您的項目創建一個BaseViewController，該項目源自UIViewController。您可以使用BaseViewController中的常用方法在每個viewController中創建custom leftBarButton。在項目中剩餘的viewController應derived from this BaseViewController，

class BaseViewController: UIViewController { 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     createLeftBarButton(image: #Pass image here#, width: #Pass width of your image view#) // Create custom back bar button. 
    } 

    /**Create cutom back bar button*/ 
    func createLeftBarButton(image: UIImage?, width: CGFloat) { 

     let backButton: UIButton = UIButton(frame: CGRect(x: 0, y: 0, width: width, height: 50)) 
     backButton.imageView?.contentMode = .scaleAspectFill 
     backButton.imageView?.bounds = CGRect(x: 0, y: 0, width: width, height: width) 
     backButton.setImage(image, for: .normal) 
     backButton.setImage(image, for: .highlighted) 
     backButton.addTarget(self, action: #selector(leftBarButtonItemPressed(_:)), for: .touchUpInside) 

     let leftItem: UIBarButtonItem = UIBarButtonItem(customView: backButton) 
     navigationItem.leftBarButtonItem = leftItem 

    } 

    /**Custom back bar button pressed. So handle here*/ 
    func leftBarButtonItemPressed(_ sender: UIButton) { 

     view.endEditing(true) // End editing if any. 
     if isViewControllerPresented() { // Check view controller is presented or pushed 
      dismiss(animated: true, completion: nil) // Dismiss ViewController if presented 
     } else { 
      _ = navigationController?.popViewController(animated: true) // Pop ViewController if pushed 
     } 

    } 

    /**To check whether view controller is presented or pushed.*/ 
    func isViewControllerPresented() -> Bool { 

     if self.presentingViewController?.presentedViewController == self { 
      return true 
     } 
     if (self.navigationController != nil && self.navigationController?.presentingViewController?.presentedViewController == self.navigationController) && self.navigationController?.viewControllers.count == 1 { 
      return true 
     } 
     if self.tabBarController?.presentingViewController is UITabBarController { 
      return true 
     } 
     return false 

    } 

    } 

// Sub class your remaining viewControllers like this. 
class FirstViewController: BaseViewController { 

    override func viewDidLoad() { 
     super.viewDidLoad() // When calling this super method, the custom back bar button will be created for you 
    } 

}

感謝。

來源

2017-08-08 04:03:12

您可以通過設置navigationItem的BackButtonBackgroundImage;

也可以設置爲全球的外觀效果：

let item = UIBarButtonItem.appearance(whenContainedInInstancesOf: [UINavigationBar.self]) item.setBackButtonBackgroundVerticalPositionAdjustment(-10, for: .default) item.setBackButtonBackgroundImage(youImage, for: .normal, barMetrics: .default)

去除背部的標題，你可以這樣做：

@implementation UINavigationItem (BackItem)

-(UIBarButtonItem *)backBarButtonItem { UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithTitle:@" " style:UIBarButtonItemStylePlain target:nil action:nil]; item.tintColor = [UIColor darkGrayColor]; return item; }

@end

來源

2017-08-08 06:05:41 BruceLiu

在我的應用程序中創建自定義後退按鈕

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