Question

我在我的项目中实现了assistolab下拉列表。但在某些viewcontroller中，它无法正常工作。显示，

无法在属性初始值设定项中使用实例成员我的代码片段在下面给出

class MobileTopUpVC: UIViewController,UITextFieldDelegate {

    let dropDown = DropDown() //error is here

    @IBOutlet weak var mobileTopUpImag: UIImageView!
    @IBOutlet weak var amountTxt: UITextField!
    @IBOutlet weak var mobileNumberTxt: UITextField!
    @IBOutlet weak var operatorTxt: UITextField!
    @IBOutlet weak var countryTxt: UITextField!
    @IBOutlet weak var DropDown: UIView!

    @IBOutlet weak var backGroundView: UIView!
    var textArray = [UITextField]()
    var countryArray:[String] = colors.countryArray
    var operatorArray:[String] = colors.opArray





    @IBOutlet weak var proceedButton: UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()




        backGroundView.layer.cornerRadius = backGroundView.frame.width/2
        backGroundView.clipsToBounds = true
        //countryArray = colors.countryArray
          backGroundView.layer.borderWidth = 3
        backGroundView.layer.borderColor = colors.second.cgColor
        textArray = [countryTxt,operatorTxt,amountTxt,mobileNumberTxt]
        let view1:UIView! = UIView()

        view1.frame = CGRect(x: 0, y: 0, width: 0, height: 0)

        countryTxt.inputView  = view1
        operatorTxt.inputView  = view1
//        countryTxt.layer.borderWidth = 1
//        countryTxt.layer.borderColor = UIColor.green.cgColor
//        countryTxt.borderStyle = UITextBorderStyle.bezel
        borderStyle()
        proceedButton.Cradius(size: 15.0)
        mobileTopUpImag.image = mobileTopUpImag.image?.withRenderingMode(.alwaysTemplate)
        mobileTopUpImag.tintColor = colors.second
        countryDropDown()
    }

这一错误令我感到困扰

let dropDown = DropDown()

请帮我解决此问题

Answer 1

将您的代码更改为以下内容，以便在viewDidLoad

中初始化DropDown

并将您的视图名称从“DropDown”更改为其他内容：D

class MobileTopUpVC: UIViewController,UITextFieldDelegate {

    let dropDown: DropDown? //Changed**

    @IBOutlet weak var mobileTopUpImag: UIImageView!
    @IBOutlet weak var amountTxt: UITextField!
    @IBOutlet weak var mobileNumberTxt: UITextField!
    @IBOutlet weak var operatorTxt: UITextField!
    @IBOutlet weak var countryTxt: UITextField!
    @IBOutlet weak var dropDownView: UIView! // Change your VIEW NAME!!!

    @IBOutlet weak var backGroundView: UIView!
    var textArray = [UITextField]()
    var countryArray:[String] = colors.countryArray
    var operatorArray:[String] = colors.opArray





    @IBOutlet weak var proceedButton: UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()
        dropDown = DropDown()




        backGroundView.layer.cornerRadius = backGroundView.frame.width/2
        backGroundView.clipsToBounds = true
        //countryArray = colors.countryArray
          backGroundView.layer.borderWidth = 3
        backGroundView.layer.borderColor = colors.second.cgColor
        textArray = [countryTxt,operatorTxt,amountTxt,mobileNumberTxt]
        let view1:UIView! = UIView()

        view1.frame = CGRect(x: 0, y: 0, width: 0, height: 0)

        countryTxt.inputView  = view1
        operatorTxt.inputView  = view1
//        countryTxt.layer.borderWidth = 1
//        countryTxt.layer.borderColor = UIColor.green.cgColor
//        countryTxt.borderStyle = UITextBorderStyle.bezel
        borderStyle()
        proceedButton.Cradius(size: 15.0)
        mobileTopUpImag.image = mobileTopUpImag.image?.withRenderingMode(.alwaysTemplate)
        mobileTopUpImag.tintColor = colors.second
        countryDropDown()
    }

Answer 2

您正在使用DropDown类作为属性名称。检查代码中的以下行 -

@IBOutlet weak var DropDown：UIView！

应该是这样的 -

@IBOutlet weak var dropDownView：UIView！

不能在属性初始化程序DropDown库中使用实例成员

2 个答案: