ios - 在iOS中切换语言RTL时UIPickerView文本未居中对齐

我使用delegate方法设置UIPickerView的标题并设置.center对齐。但如果我从英语换成阿拉伯语，它是右对齐的。如果语言是阿拉伯语在启动期间，它左对齐后切换到英语。

func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
    let title = getPickerViewTitle(for: row)
    let label = UILabel(frame: CGRect(x: 0, y: 0, width: 300, height: 37))
    label.text = title
    label.textAlignment = .center
    label.backgroundColor = UIColor.clear
    return label
}

最佳答案

如果您对组件使用RTL语言支持，那么您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
        }