更改所选行标签颜色选择器视图SWIFT 1.2

Question

我有一个创建了pickerview用下面的代码

@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) { 

     } 

现在我想，如果我更改所选行的标签（文字）的颜色，例如向下滚动并选择蓝色，文本颜色应该变成橙色，其他2个标签将变成黑色，当我选择其他行时，它们也会变成黑色。我曾尝试下面的代码，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 

    } 

我不知道我是否应该与didSelectRow或viewForRow方法实现它，有人可以请帮我在这？

Answer 1

，你可以这样做以下：

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() 
    } 
}