Question

我有以下问题：我可以更改uipicker内部行的文本颜色，但不能更改我想要的特定行的文本颜色，选择器会变得混乱，很多文本标签会变成蓝色。

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
    UILabel *retval = (UILabel*)view;
    if (!retval) {
        retval= [[UILabel alloc] initWithFrame:CGRectMake(0.0f, 0.0f, [pickerView rowSizeForComponent:component].width, [pickerView rowSizeForComponent:component].height)];
    }
    retval.text = [arraySubSistemasDeSaude objectAtIndex:row];
    if(pickerView == subSistemaSaudePicker) {

        if ([retval.text isEqualToString:@"Seguros de saúde"]) {

            NSLog(@"ROW=%d",row);
            [retval setTextColor:[UIColor blueColor]];
        }
        if ([retval.text isEqualToString:@"Sistemas de Saúde e Equiparados"]) {
           NSLog(@"ROW=%d",row);
       [retval setTextColor:[UIColor blueColor]];

         if ([retval.text isEqualToString:@"Seguradoras-Acidentes de Trabalho, viação/pessoais e vida"]) {
            NSLog(@"ROW=%d",row);
            [retval setTextColor:[UIColor blueColor]];
         }
       if ([retval.text isEqualToString:@"Empresas, associações e outras entidades"]) {
            NSLog(@"ROW=%d",row);

            [retval setTextColor:[UIColor blueColor]];

       }


        [retval setBackgroundColor:[UIColor clearColor]];
        retval.font = [UIFont systemFontOfSize:14];

       }

    } else if(pickerView == horarioPicker) {
        retval.text =[arrayHorarios objectAtIndex:row];
        [retval setBackgroundColor:[UIColor clearColor]];
        retval.font = [UIFont systemFontOfSize:14];

    } else if(pickerView == examesPicker) {
        retval.text =[arrayExames objectAtIndex:row];
        [retval setBackgroundColor:[UIColor clearColor]];
        retval.font = [UIFont systemFontOfSize:14];

    } else if(pickerView == consultasPicker) {
        retval.text =[arrayConsultas objectAtIndex:row];
        [retval setBackgroundColor:[UIColor clearColor]];
        retval.font = [UIFont systemFontOfSize:14];

    }else {
        assert(NO);
    }
  return retval;
}

对不起我的英语不好，我希望我能提前清楚地说明这个问题。

Answer 1

问题是，您正在重复使用每一行的视图，并且当它不应该是蓝色时，您不会将UILabel颜色设置为黑色。

添加此代码......

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
    UILabel *retval = (UILabel*)view;
    if (!retval) {
        retval= [[UILabel alloc] initWithFrame:CGRectMake(0.0f, 0.0f, [pickerView rowSizeForComponent:component].width, [pickerView rowSizeForComponent:component].height)];
    }
    [retval setTextColor:[UIColor blackColor]];
    retval.text = [arraySubSistemasDeSaude objectAtIndex:row];
    ......

这样，每次拉出重复使用的视图时，它首先会将颜色设置为黑色。然后代码将检查您想要的蓝色并将它们设置为蓝色。你这样做的方式是在其中一些上面设置蓝色，然后当你重复使用它们时，你永远不会把它重置为黑色。

Answer 2

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row       forComponent:(NSInteger)component  reusingView:(UIView *)view {

  UILabel *pickerLabel = (UILabel *)view;

  if (pickerLabel == nil) {

        CGRect frame = CGRectMake(0.0, 0.0, 80, 32);
        pickerLabel = [[[UILabel alloc] initWithFrame:frame] autorelease];
        [pickerLabel setTextAlignment:UITextAlignmentLeft];
        [pickerLabel setBackgroundColor:[UIColor clearColor]];
        [pickerLabel setFont:[UIFont boldSystemFontOfSize:15]];
        [pickerLabel setTextColor:[UIColor blackColor]];
        [pickerLabel setText:@"MyTest"];

   }



   return pickerLabel;

}

更改特定的行颜色uipicker

2 个答案: