使用未聲明的類型錯誤：如何比較對象與類類型？

Question

如何使用AnyClass泛型類型比較object：

我想比較類的類型和類名稱的對象應該作爲參數傳遞。

func checkGeneric(className: AnyClass) { 
    let object = UIViewController() 
    if (object is className) { // Use of undeclared type `className` 
     print(className) 
    } 
} 

checkGeneric(className: UIViewController.self) 

Answer 1

您可以使用type(of:)得到object的類型，並將其與AnyClass比較。試試這個..

func checkGeneric(className: AnyClass) { 
    let object = UIViewController() 
    if (type(of: object) == className) { // Use of undeclared type class name 
     print(className) 
    } 
} 

Answer 2

您還可以isKinOf

func checkGeneric(className: AnyClass) 
    { 
     print(className) 
     let object = UIViewController() 
     if object.isKind(of: className) { 
      print("yes") 
     } else { 
      print("no") 
     } 

    } 

    checkGeneric(className: UIViewController.self) 
    checkGeneric(className: NSMutableArray.self) 

OUPUT做

UIViewController 
yes 
NSMutableArray 
no 

Answer 3

試試這個

func checkGeneric(className: AnyClass) { 
    let object = ViewController() 
    if (object.isKind(of: className)) { 
     print("Class Name is : \(className)") 
    } 
} 

checkGeneric(className: ViewController.self) 

您可以比較C對象lass使用isKind（），

let viewController = UIViewController() 

viewController.isKind(of: ViewController.self)