在iOS中切换语言RTL时UIPickerView文本未居中对齐

Question

我正在使用委托方法来设置FormData? optionalFormData的标题并设置UIPickerView的对齐方式。但是，如果我从英语切换到阿拉伯语，它是正确对齐的。如果在启动过程中使用的语言是阿拉伯语，则切换到英语后会向左对齐。

.center

Answer 1

如果对组件使用RTL语言支持，则需要强制更新对齐方式。

 func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
            var pickerLabel : UILabel
            if let label = view as? UILabel {
                pickerLabel = label
            } else {
                pickerLabel = UILabel()
                pickerLabel.textColor = UIColor.black
                if  pickerLabel.effectiveUserInterfaceLayoutDirection == .rightToLeft {
                    pickerLabel.textAlignment = NSTextAlignment.center

                }
            }
            pickerLabel.text = "10"
            pickerLabel.sizeToFit()

            return pickerLabel
        }

Answer 2

无需尝试就可以给UI标签框架尝试。仅给您选择器一个约束。

func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView!) -> UIView
{
    var pickerLabel = UILabel()
    pickerLabel.textColor = UIColor.blackColor()
    pickerLabel.text = "PickerView Cell Title"
    pickerLabel.font = UIFont.boldSystemFont(ofSize: 13)
    pickerLabel.textAlignment = NSTextAlignment.Center
    return pickerLabel
}