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这是我显示pickerview的代码。

 - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
    UILabel *pickerLabel = (UILabel *)view;
    CGSize limitSize = CGSizeMake(300.0f, 50.0f);
    CGSize textSize;
    CGRect labelRect;

    switch ([pickerView tag]) {

        case 1: //Quiz picker
        {    
            //m_txtPurpose.text=@"Test";
            QuizGenre *quiz = [m_arrQuizGenre objectAtIndex:row];
            NSString *title = [quiz m_quizGenreName];
            textSize = [title sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:limitSize lineBreakMode:UILineBreakModeWordWrap];
            labelRect = CGRectMake(0, 0, textSize.width, textSize.height);
            NSLog(@"length:%i title:%@",[title length],title);
            NSLog(@"h:%f w:%f",textSize.height,textSize.width);
            if (pickerLabel == nil)
            {
                pickerLabel = [[[UILabel alloc] initWithFrame:labelRect] autorelease];
                [pickerLabel setFont:[UIFont systemFontOfSize:14]];
                [pickerLabel setBackgroundColor:[UIColor clearColor]];
                [pickerLabel setLineBreakMode:UILineBreakModeWordWrap];
                [pickerLabel setTextAlignment:UITextAlignmentCenter];
                [pickerLabel setText:title]; 
                [pickerLabel setNumberOfLines:3];


            }

            break;  
        case 2:  //Purpose picker
            {
                //cost.text = @"ABC";
                Purpose *prp = [m_arrPurpose objectAtIndex:row];
                NSString *title = [prp m_purposeName];
                textSize = [title sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:limitSize lineBreakMode:UILineBreakModeWordWrap];
                labelRect = CGRectMake(0, 0, textSize.width, textSize.height);
                NSLog(@"length:%i title:%@",[title length],title);
                NSLog(@"h:%f w:%f",textSize.height,textSize.width);
                if (pickerLabel == nil)
                {
                    pickerLabel = [[[UILabel alloc] initWithFrame:labelRect] autorelease];
                    [pickerLabel setFont:[UIFont systemFontOfSize:14]];
                    [pickerLabel setBackgroundColor:[UIColor clearColor]];
                    [pickerLabel setLineBreakMode:UILineBreakModeWordWrap];
                    [pickerLabel setTextAlignment:UITextAlignmentCenter];
                    [pickerLabel setText:title]; 
                    [pickerLabel setNumberOfLines:3];


                }
                break;
            default:

                break;
            }

        }
    }
    return pickerLabel;
}

我的 Picker 视图在第 6 行后显示错误值。我的测验选择器视图中有 13 个值。像测验类型：1>艺术2>地理3>常识到13号>电视。在第 6 个值之后，它从第一条记录开始。这是图像

选择器快照中的错误值

安装它应该显示类似这样的东西。电影、音乐、电视、政治等等。您的帮助将不胜感激。谢谢

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1 回答 1

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我已经找到了解决这个问题的正确方法。这段代码所做的是在六条记录之后刷新选择器并且这个条件“如果（pickerLabel == nil）”变为假因此它重复相同的记录。我曾经将这行代码复制到其他部分，它对我来说也很好。

 else{
                [pickerLabel setFont:[UIFont systemFontOfSize:14]];
                [pickerLabel setBackgroundColor:[UIColor clearColor]];
                [pickerLabel setLineBreakMode:UILineBreakModeWordWrap];
                [pickerLabel setTextAlignment:UITextAlignmentCenter];
                [pickerLabel setText:title]; 
                [pickerLabel setNumberOfLines:3];
      }

可能对像我这样面临同样问题的其他人有所帮助。

于 2012-05-10T05:22:45.107 回答