更改所選行標籤顏色選擇器視圖SWIFT 1.2

Question

我有一個創建了pickerview用下面的代碼

@IBOutlet var myPicker: UIPickerView! 

    var colors: [String] = ["red","green","blue"] 

    override func viewDidLoad() { 
      super.viewDidLoad()  

      myPicker = UIPickerView() 
      myPicker.dataSource = self 
      myPicker.delegate = self 
    } 

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int { 
      return 1 
     } 

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int { 
      return colors.count 
     } 

    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! { 
      return colors[row] as! String 
     } 

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) { 

     } 

現在我想，如果我更改所選行的標籤（文字）的顏色，例如向下滾動並選擇藍色，文本顏色應該變成橙色，其他2個標籤將變成黑色，當我選擇其他行時，它們也會變成黑色。我曾嘗試下面的代碼，但它不工作

func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView!) -> UIView { 
     var pickerLabel = UILabel() 
     var myTitle:NSAttributedString 
     let titleData = colors[row] 
     if pickerView.selectedRowInComponent(component) == row { 
      myTitle = NSAttributedString(string: titleData, attributes: [NSForegroundColorAttributeName: UIColor.redColor()]) 
     } else { 
      myTitle = NSAttributedString(string: titleData, attributes: [NSForegroundColorAttributeName: UIColor.blueColor()]) 
     } 

     //This way you can set text for your label. 
     pickerLabel.attributedText = myTitle 

     return pickerLabel 

    } 

我不知道我是否應該與didSelectRow或viewForRow方法實現它，有人可以請幫我在這？

Answer 1

，你可以這樣做以下：

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate { 

    var colors = ["red","green","blue"] 

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int { 
    return 1 
    } 

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int { 
    return colors.count 
    } 

    func pickerView(pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? { 
    let color = (row == pickerView.selectedRowInComponent(component)) ? UIColor.orangeColor() : UIColor.blackColor() 
    return NSAttributedString(string: colors[row], attributes: [NSForegroundColorAttributeName: color]) 
    } 

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) { 
    pickerView.reloadAllComponents() 
    } 
}