Question

我要打印7 6 18 5 20 48 2 97 8 3 6 9 12 28 5 7 10名称，除了使用每个ViewController扩展名之外，还可以使用ViewController扩展名打印ViewController名称吗？或有什么建议？。

例如，如果您处于登录页面，则应打印ViewController，如果移至主屏幕，则应打印LoginViewController，我尝试了以下代码，但未打印确切的班级名称。

HomeViewController

在extension UIViewController { @objc dynamic func _tracked_viewWillAppear(_ animated: Bool) { print("ClassName@: "+String(describing: type(of: self))) _tracked_viewWillAppear(animated) } static func swizzle() { if self != UIViewController.self { return } let _: () = { let originalSelector = #selector(UIViewController.viewWillAppear(_:)) let swizzledSelector = #selector(UIViewController._tracked_viewWillAppear(_:)) let originalMethod = class_getInstanceMethod(self, originalSelector) let swizzledMethod = class_getInstanceMethod(self, swizzledSelector) method_exchangeImplementations(originalMethod!, swizzledMethod!); }() }文件中

Appdelegate.swift

输出：-

func application( _ application: UIApplication, 
            didFinishLaunchingWithOptions 
            launchOptions: [UIApplication.LaunchOptionsKey: Any]?
            ) -> Bool {

               UIViewController.swizzle()

             return true
}

但是它不是打印名称ClassName@: UIInputWindowController ClassName@: UISystemKeyboardDockController ClassName@: UICompatibilityInputViewController ClassName@: UICompatibilityInputViewController ClassName@: UICompatibilityInputViewController ClassName@: UICompatibilityInputViewController ClassName@: UICompatibilityInputViewController ClassName@: UISystemKeyboardDockController。谢谢。

Answer 1

我会做类似的事情

struct StringUtils {
    static func className(_ obj: AnyObject) -> String {
        return String(describing: type(of: obj))
    }
}

然后将其命名为

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        print(StringUtils.className(self))
    }

}

Answer 2

您可以使用type(of: T)方法

print(type(of: self))

游乐场示例：

import UIKit

class SomeViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        print(type(of: self))
    }
}

let vc = SomeViewController()
vc.loadViewIfNeeded()

输出：SomeViewController

Answer 3

您可以自己编写一个UIViewController子类，重写viewDidAppear方法，并使用以下代码：

   override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        print("Shown viewcontroller " + String(describing: type(of: self)))
        // (do whatever)
    }

然后，从其余的类中继承该类。

无法使用方法刷新来打印当前的ViewController名称

3 个答案: