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xcode - value of type 'uidatepicker?' has no member 'delegate' error

All three are in an error state. When I looked into it, it was written that the position of the closing parenthesis was different, but I do not understand well

Error message 
Error message
Value of type 'UIDatePicker?' Has no member 'delegate'
### Applicable source code
 self.testPickerView.delegate = self
 self.testPickerView.dataSource = self
 count = dataList [0] [testPickerView.selectedRow (inComponent: 1)] * 60

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swift

swift xcode
  • Answer # 1

    I don't think

    UIDatePickerhasdelegate. (See the definition of the UIDatePicker class.)
    UIPickerViewhasdelegate.
    If testPickerView is changed to UIPickerView, it will be fixed.

    import UIKit
class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
    @IBOutlet weak var picker: UIPickerView!
    @IBOutlet weak var dater: UIDatePicker! // No delegate!
    override func viewDidLoad () {
        super.viewDidLoad ()
        picker.delegate = self
//Dater.delegate = self is NG.
        // Do any additional setup after loading the view.
    }
    func numberOfComponents (in pickerView: UIPickerView)->Int {
        return 1 // Set it appropriately.
    }
    func pickerView (_ pickerView: UIPickerView, numberOfRowsInComponent component: Int)->Int {
        return 4 // Set it appropriately.
    }
}

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