如何更改 UIPickerView 字体大小

Question

如何更改字体大小。我下面的代码不起作用。我在 iOS 9.1.

上使用 xcode7.1 和 swift 2

func pickerView(pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? {
    var attributedString: NSMutableAttributedString
    let myAttribute = [ NSFontAttributeName: UIFont(name: "Chalkduster", size: 13.0)! ]
    switch component {
    case 0:
        attributedString = NSMutableAttributedString(string: firstFieldArray[row], attributes: myAttribute )
    case 1:
        attributedString = NSMutableAttributedString(string: secondFieldArray[row], attributes: [NSForegroundColorAttributeName : UIColor.redColor()])
    default:
        attributedString = NSMutableAttributedString(string: firstFieldArray[row], attributes: myAttribute )
    }

    return attributedString
}

案例 1 工作正常，而案例 0 没有改变它的字体大小。

Answer 1

NSAttributedString 不能用于更改 UIPickerView 的字体。

您可以通过覆盖 pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView?) -> UIView

来更改字体

Answer 2

Swift 4

   func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {

      var title = UILabel()
         if let view = view {
                title = view as! UILabel
          }
        title.font = UIFont.systemFont(ofSize: 21, weight: UIFont.Weight.bold)
        title.textColor = UIColor.blue
        title.text =  PickerArray[row]
        title.textAlignment = .center

    return title

    }

如何更改 UIPickerView 字体大小

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