Swift - 通用方法

Question

在java中，您可以使用類似於以下的泛型方法，其中類型被明確指定並作爲參數傳遞給方法。這可能與迅速嗎？

public T fetchObject(Class<T> clazz, int id) { 
    // My table name is the same as class name 
    // So based on the generic type passed to method I want to fetch that record. 
} 

User user = fetchObject(User.class, 5); 

我試圖實現

public func fetchObject (id: Int /* Somehow pass the type */) -> T? { 
    // I need a way to know what class type has to be used with this generic method 
    // Create NSEntityDescription based on the generic class passed 
    // managedObjectContext getExistingObjectById 
} 

Answer 1

T.Type是什麼，我不得不用，甚至比Java是如何處理這個

public func fetchObject<T> (id: Int, type: T.Type) -> T? { 

} 

使用

var myClass = fetchObject(5, MyClass.self)