在UIPicker中设置初始值

Question

我的应用程序中有许多UIPicker。 我进行了设置，使用户在点击文本控件时出现选择器，并且用户可以选择一个值。 该值然后显示在文本字段中，但是当UIPicker出现时，我希望在文本字段中填充初始值。 目前，直到用户实际移动选择器后，才会填充文本字段。

码：

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    if([pickerView isEqual: routePicker])
    {
        route.text = [[routeArray objectAtIndex:row] valueForKey:@"route_name"];
    } 
    else if([pickerView isEqual: timePicker])
    {
        if (component == 0)
        {
            selectedHour = [hourArray objectAtIndex:row];
        } 
        else if (component == 1)
        {
            selectedMinute = [minuteArray objectAtIndex:row];
        } 
        else if (component == 2)
        {
            selectedSecond = [secondArray objectAtIndex:row];
        }
        time.text = [NSString stringWithFormat:@"%@:%@:%@", selectedHour, selectedMinute, selectedSecond];
    }
    else if([pickerView isEqual: activityPicker])
    {
        activity.text = [activityArray objectAtIndex:row];
    }
    else if([pickerView isEqual: intensityPicker])
    {
        intensity.text = [intensityArray objectAtIndex:row];
    }
}

问候斯蒂芬

Answer 1

在文本框委托方法上打开选取器之前

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
 if(textField.tag==kINTENSITYTEXTTAG)
 {
  if(![intensity.text length])
  {
   intensity.text = [intensityArray objectAtIndex:0];
  }
 }
// SAME FOR REMAINING textFields Based on the tag to get which textfield is selected
}

令人愉快的...