将 UITextField 的 inputView 属性设置为 UIPicker 在 Swift 中不起作用

Question

您好，我正在尝试在用户单击文本字段时以编程方式弹出UIPickerView视图。 我试过这个，但它没有做任何事情，它不起作用。 当我点击文本框时什么也没有发生

class UserProfileTableViewController: UITableViewController,UITextFieldDelegate,UIPickerViewDelegate,UIPickerViewDataSource {
 var itemPicker: UIPickerView! = UIPickerView()
    
    @IBOutlet weak var genderTxtField: UITextField!
   
    
    var gender = ["MALE","FEMALE"]
    override func viewDidLoad() {
        super.viewDidLoad()
       
        genderTxtField.delegate = self
        
        itemPicker!.delegate = self
        itemPicker!.dataSource = self
        itemPicker!.backgroundColor = UIColor.blackColor()
    
        self.genderTxtField.inputView = itemPicker
    }
    
    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int{
        return 1
    }
    
    // returns the # of rows in each component..
    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{
        return gender.count
    }
    
    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return gender[row]
    }
    
    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
    {
        genderTxtField.text = gender[row]
        //.hidden = true;
    }
    
    func textFieldShouldBeginEditing(textField: UITextField) -> Bool {
        itemPicker.hidden = false
        return false
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

Answer 1

您当前代码中的问题在于此方法：

func textFieldShouldBeginEditing(textField: UITextField) -> Bool {
    itemPicker.hidden = false 
    return false // <--- this is not letting the textField become editable
}

我建议完全删除此方法。

Answer 2

好的，所以我挖出了我写的类似的东西，它使用日期选择器，但一般代码是相同的。

var datePicker: UIDatePicker!
@IBOutlet var dateFrom: UITextField!

override func viewDidLoad() {
   super.viewDidLoad()
   self.setUpDatePicker()
}

func setUpDatePicker() {
        datePicker.datePickerMode = UIDatePickerMode.Date
        let toolBar = UIToolbar(frame: CGRect(x: 0, y: 0, width: 0, height: 44))
        let doneBtn = UIBarButtonItem(title: "Select", style: UIBarButtonItemStyle.Done, target: self, action: "selectDate")
        let space = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.FlexibleSpace, target: nil, action: nil)

        toolBar.setItems([space, doneBtn], animated: false)

        YOURTEXTFIELD.inputAccessoryView = toolBar
        YOURTEXTFIELD.inputView = datePicker             
    }

然后你添加一个函数来处理完成按钮的按下

func selectDate() {
        let formatter = NSDateFormatter()
        formatter.dateFormat = "dd-MM-yyyy";

        YOURTEXTFIELD.text = formatter.stringFromDate(datePicker.date)
        YOURTEXTFIELD.resignFirstResponder()
    }

只需将 YOURTEXTFIELD 替换为您的版本 sexTxtField 并将日期选择器更改为您的选择器。

不要忘记检查一切是否已链接

Answer 3

itemPicker!.backgroundColor = UIColor.blackColor() 

改成

 itemPicker!.backgroundColor = UIColor.whiteColor()

然后删除

func textFieldShouldBeginEditing(textField: UITextField) -> Bool {
    itemPicker.hidden = false
    return false
}

祝你好运！

Answer 4

func textFieldShouldBeginEditing(textField: UITextField) -> Bool 
{
    itemPicker.hidden = false 
    return true
}

您只需要在func textFieldShouldBeginEditing中将 false 更改为 true 。