ios - 无法将类型 'listOfContacts' 的值转换为预期参数类型 'UIViewController'

Question

这是代码

let logButton : UIButton = {
    let login = UIButton()


    login.translatesAutoresizingMaskIntoConstraints = false

    login.setTitle("Login", for: .normal)
    login.setTitleColor(UIColor.white, for: .normal)
    login.backgroundColor = UIColor(red: 0/255, green: 61/255, blue: 114/255, alpha: 1.0)

    login.addTarget(self, action: #selector(loginButton), for: .touchUpInside)

    return login
}()


@objc func loginButton(){
    let contactList = listOfContacts()
    present(contactList, animated: true, completion: nil)

}

Cannot convert value of type 'listOfContacts' to expected argument type 'UIViewController'

请为此提供建议或解决方案

Answer 1

你的问题就在这里

 let contactList = listOfContacts()
 present(contactList, animated: true, completion: nil)

您尝试使用 listOfContacts 类型的 contactList 作为 present 方法的参数，该方法采用 UIViewController 类型作为第一个参数这是应该呈现的 VC

这是方法签名

func present(_ viewControllerToPresent: UIViewController,animated flag: Bool,completion: (() -> Void)? = nil)