Question

我在没有太多帮助的情况下查看了许多类似的Stack Overflow问题，因为它们与我的需求略有不同。

我正在创建UIView的子类，如下所示。我想在初始化类时传递一个视图控制器并调用setup方法。

错误：

在super.init初始化self
之前，在方法调用'setup'中使用self

代码：

class ProfilePhotoView: UIView{

    var profileImage   =   UIImageView()
    var editButton      =   UIButton()
    var currentViewController   : UIViewController



    init(frame: CGRect, viewController : UIViewController){
        self.currentViewController = viewController
        setup()
    }



    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }


    func setup(){

        profileImage.image = UIImage(named: "profilePlaceHolder")
        editButton.setTitle("edit", for: .normal)
        editButton.setTitleColor(UIColor.blue, for: .normal)
        editButton.addTarget(self, action: #selector(editPhoto), for: .touchUpInside)

        profileImage.translatesAutoresizingMaskIntoConstraints  =   false
        //addPhoto.translatesAutoresizingMaskIntoConstraints      =   false
        editButton.translatesAutoresizingMaskIntoConstraints     =   false

        self.addSubview(profileImage)
        self.addSubview(editButton)

        let viewsDict = [ "profileImage"    :   profileImage,
                          "editButton"       :   editButton
        ] as [String : Any]

        self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-10-[profileImage]", options: [], metrics: nil, views: viewsDict))
        self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-10-[profileImage]", options: [], metrics: nil, views: viewsDict))

                 self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-10-[editButton]", options: [], metrics: nil, views: viewsDict))
        self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:[profileImage]-10-[editButton]", options: [], metrics: nil, views: viewsDict))

    }

    func editPhoto(){
        Utils.showSimpleAlertOnVC(targetVC: currentViewController, title: "Edit Button Clicked", message: "")
    }


}

Answer 1

您没有使用super.init(frame:)方法致电init(frame:viewController。需要在设置self.currentViewController和调用setup之间完成。

init(frame: CGRect, viewController: UIViewController) {
    self.currentViewController = viewController

    super.init(frame: frame)

    setup()
}

您应该阅读Swift书的Initialization章节（尤其是Class Inheritance and Initialization部分）。课程的初始化需要以清晰的文件形式完成。

在super.init初始化self之前在方法调用中使用self

1 个答案: