在我的应用程序中创建自定义后退按钮

我试图改变我的应用程序中导航控制器后退按钮的默认外观。在我的应用程序中创建自定义后退按钮

我想使用图像（图标）并删除“返回”文本。此代码在整个按钮上拉伸图像并且不删除按钮标题。

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

的建议是如何做的是内部的AppDelegate（didFinishLaunchingWithOptions）？

来源

2017-08-08 Sanae Ariuop

用它创建UIViewController的基类子类。 –

@ElTomato你能解释一下吗？感谢您的帮助。 –

简单的做法是为您的项目创建一个BaseViewController，该项目源自UIViewController。您可以使用BaseViewController中的常用方法在每个viewController中创建custom leftBarButton。在项目中剩余的viewController应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 
    } 

}

感谢。

来源

2017-08-08 04:03:12

您可以通过设置navigationItem的BackButtonBackgroundImage;

也可以设置为全球的外观效果：

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

去除背部的标题，你可以这样做：

@implementation UINavigationItem (BackItem)

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

@end

来源

2017-08-08 06:05:41 BruceLiu

在我的应用程序中创建自定义后退按钮

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