for pickerView中titleForRow中的循环不起作用

Question

我正在创建时钟pickerView并使用了以下内容：

var countSec = Array(0...10)
var countMin = Array(0...59)
var countHour = Array(0...59)

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    if component == 0{
        for count in countSec {
            return "\(count)"
        }
    }else{
        for count in countMin{
            return "\(count)"
        }
    }
    return nil
}

但是当我运行时，所有数据均为0。

Answer 1

请勿在titleForRow中使用循环。只需为请求的行返回适当的值即可。

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    if component == 0 {
        return "\(countSec[row])"
    } else {
        return "\(countMin[row])"
    }
}