Question

我有一个带有2个组件的UIPickerView。

我希望UILabel显示所选行。现在我有2个UILabels并排，但我认为有一个显示数据会更有意义。

UIPickerView的第一个组件是1-500的数组，第二个组件是字符串数组，只是“.0lb和1 / 2lb”。

pickerArray = [[NSMutableArray alloc] initWithCapacity:700];
    for ( int i = 0 ; i <= 1000 ; ++i)
       [pickerArray addObject:[NSString stringWithFormat:@"%d", i]]; 
pickerArrayHalf = [[NSMutableArray alloc]initWithCapacity:2];
[pickerArrayHalf addObject:@".0 lb"];
[pickerArrayHalf addObject:@"1/2 lb"];

我目前正在使用此代码输入2 UILabels：

- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component 
{
    if (thePickerView.tag==1)
    {
        if (component == 0)
        {
            NSLog(@"Selected weight 1: %@. Index of  array: %i", [pickerArray objectAtIndex:row], row);
            NSString *weightSelected;
            weightSelected = [NSString stringWithFormat:@"%@", [pickerArray objectAtIndex:row]];
            weightLabel.text = weightSelected;
        }
        else
        {
            NSLog(@"Selected weight 2: %@. Index of  array: %i", [pickerArrayHalf objectAtIndex:row], row);
            NSString *weightSelected;
            weightSelected = [NSString stringWithFormat:@"%@", [pickerArrayHalf objectAtIndex:row]];
            weightLabel2.text = weightSelected;
        }
    }

目前1 UILabel超过2的想法是因为这个字符串应该是一个数字，如“50.0”或“200 1/2”等。

Answer 1

使用此

选择第二列中的行时，可以附加字符串

weightSelected = [weightSelected stringByAppendingFormat:@" %@", [pickerArrayHalf objectAtIndex:row]];

然后将其设置为单个UILabel。

Answer 2

- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component 
{
    if (thePickerView.tag==1)
    {
       NSMutableString *labelText = [[NSMutableString alloc] initWithString:@""];
        if (component == 0)
        {
            NSLog(@"Selected weight 1: %@. Index of  array: %i", [pickerArray objectAtIndex:row], row);

            [labelText appendFormat:@"%@", [pickerArray objectAtIndex:row]];

        }
        else
        {
            NSLog(@"Selected weight 2: %@. Index of  array: %i", [pickerArrayHalf objectAtIndex:row], row);

           [labelText appendFormat:@"%@", [pickerArrayHalf objectAtIndex:row]];

        }
        weightLabel2.text = labelText;
        [labelText release];
    }

已更新：

在.h文件中声明两个实例变量我正在命名并使用它们，如下所示

NSMutableString *firstComponentText;
NSMutableString *secondComponentText;

将viewDidLoad中的可变字符串上的init分配为[[NSMutableString alloc]initWithString:@""];

- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component 
{
    if (thePickerView.tag==1)
    {

        if (component == 0)
        {
            NSLog(@"Selected weight 1: %@. Index of  array: %i", [pickerArray objectAtIndex:row], row);

            [firstComponentText setString:[pickerArray objectAtIndex:row]];

        }
        else
        {
            NSLog(@"Selected weight 2: %@. Index of  array: %i", [pickerArrayHalf objectAtIndex:row], row);

           [secondComponentText setString:[pickerArrayHalf objectAtIndex:row]];

        }
        weightLabel2.text = [firstComponentText stringByAppendingFormat:@" %@",secondComponentText];

    }

如何格式化UILabel以显示2个UIPickerView组件？

2 个答案: