UIPicker - 如何記錄標準selectedRow如果用戶只點擊確定按鈕

Question

我有一個UIpicker模態窗口。一切工作正常，除了一件事。當用戶單擊輸入文本字段時，帶有UIpickerView的模式窗口按預期打開。如果所選的行是正確的，並且用戶單擊確定按鈕，則當前代碼無法註冊該值。

// Set the default row, so if user click ok without changing it is recorded 
self.picker.selectRow(0, inComponent: 0, animated: false) 

是否有替代didSelectRow？我認爲這是問題，因爲用戶不會選擇一行，因爲它已經被代碼預選。

// Capture the picker selection 
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) { 
    // This method is triggered whenever the user makes a change to the picker selection. 
    // The parameter named row and component represents what was selected. 
    selectedType = pickerData[row] as String 
} 

Answer 1

很好解決了它。只需添加一個測試來查看selectedType是否爲零。

@IBAction func OkBtnWasPressed(_ sender: Any) { 
     // update text to selected value 
     if selectedType == nil { 
      typeTextField.text = pickerData[defaultRow] 
     } else { 
      typeTextField.text = selectedType 
     } 
     animateOut() 
    }