这儿主要会用到OC的NSClassFromString方法

extension String {
    
    func stringTransformClass() -> AnyClass? {
        guard let bundleName: String = Bundle.main.object(forInfoDictionaryKey: "CFBundleName") as? String else {
            return nil
        }
        let classPath = bundleName + "." + self;
        var anyClass: AnyClass? = NSClassFromString(classPath)
        if (anyClass == nil) {
            anyClass = NSClassFromString(self)
        }
        return anyClass
    }
    
}

假如我定义了个如下类：

class Person:NSObject {
    
    func study() {
        print("开始学习")
    }
}

guard let personClass = "Person".stringTransformClass() else {return}
guard let objectType = personClass as? NSObject.Type else {return}
guard let person = objectType.init() as? Person else {return}
person.study()
//打印开始学习