难以改变两个组件UIPickerView的文本颜色

Question

我希望能够更改两行的文本颜色，我正在使用此代码：

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

    NSString *rowItem = [weight objectAtIndex: row];


    UILabel *lblRow = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, 0.0f, [pickerView bounds].size.width, 44.0f)];

    [lblRow setTextAlignment:UITextAlignmentCenter];

    [lblRow setTextColor: [UIColor redColor]];

    [lblRow setText:rowItem];

    [lblRow setBackgroundColor:[UIColor clearColor]];

    return lblRow;
}

它使UIPickerView中的两个组件具有相同的数据，但它会改变颜色。如何在不更改数据的情况下更改两个组件的颜色？

Answer 1

你有两个参数row和component

如果调整组件并获得所需数据，则必须使用

-(UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{
    if (component == 0)
        NSString *rowItem = [weight objectAtIndex: row];
        UILabel *lblRow = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, 0.0f, [pickerView bounds].size.width, 44.0f)];
        [lblRow setTextAlignment:UITextAlignmentCenter];
        [lblRow setTextColor: [UIColor redColor]];
        [lblRow setText:rowItem];
        [lblRow setBackgroundColor:[UIColor clearColor]];
        return lblRow;
    } else {
        // Adjust the second component 
    }
}

Answer 2

- (NSAttributedString *)pickerView:(UIPickerView *)pickerView attributedTitleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    if(component ==0)
    {
        NSString *title = @"maulik";
        NSAttributedString *attString = [[NSAttributedString alloc] initWithString:title attributes:@{NSForegroundColorAttributeName:[UIColor whiteColor]}];
        return attString;
    }
    if(component ==1)
    {
        NSString *title = @"fenil";
        NSAttributedString *attString = [[NSAttributedString alloc] initWithString:title attributes:@{NSForegroundColorAttributeName:[UIColor blackColor]}];

        return attString;
    }
    return 0;
}