Question

我有两列pickerView。在第一列我有像公里，英尺的单位。我想为km 1,2,3和foot 100,2000,300设置不同的值。现在我做了以下代码。我在viewDidLoad方法中声明了两个数组unitArray和distanceArray。

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
        return 2;
}

-(NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{

if (component == UNIT)
       return [unitArray objectAtIndex:row];
else
       return [distanceArray objectAtIndex:row];
}

- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {

        distanceRow = [distancePicker selectedRowInComponent:DISTANCE];
        unitRow = [distancePicker selectedRowInComponent:UNIT];

        dist = [distanceArray objectAtIndex:distanceRow];
        unit = [unitArray objectAtIndex:unitRow];

        txtIBOutletDistance.text =[NSString stringWithFormat:@"%@ %@",dist,unit];
}

执行此代码后，我显示了km和feet的相同值，即一列中的km和feet以及第二列中的1,2,3。我想在选择km值后应该是1,2,3并且对于脚的选择值应该是100,200,300。如果有人知道怎么做，请帮助我。我会很感激他/她。

Answer 1

您应该根据所选的UNIT更改pickerView：didSelectRow：inComponent中distanceArray的值，如下所示：

- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
    if(component == UNIT) {
        unit = [unitArray objectAtIndex:row]; //unit is a property of the interface
        if([unit IsEqualToString:@"km"] {
            distanceArray = [NSArray arrayWithObject:@"1", @"2", @"3", nil];
        } else if([unit IsEqualToString:@"feet"] {
            distanceArray = [NSArray arrayWithObject:@"100", @"200", @"300", nil];
        }
    } else {
        dist = [distanceArray objectAtIndex:row];
        txtIBOutletDistance.text =[NSString stringWithFormat:@"%@ %@",dist,unit]; 
    }
}

如何在iPhone的pickerview中为一个值设置多个值？

1 个答案: