UIPickerView

//返回每个组件上的行数
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    if(component==0)
    {
        return 2;
    }
    else  if(component==1)
    {
        if(com1==0)
        {
            return 4;
        }
        else if(com1==1)
        {
            return 3;
        }
    }
    else  if(component==2)
    {
        if(com1==0)
        {
            switch (com2) {
                case 0:
                    return 3;
                    break;
                case 1:
                    return 1;
                case 2:
                    return 1;
                case 3:
                    return 1;
                default:
                    break;
            }
        }else if(com1==1)
        {
            switch (com2) {
                case 0:
                    return 3;
                    break;
                case 1:
                    return 3;
                case 2:
                    return 2;
                default:
                    break;
            }
        }
    }
}
//返回组件数
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 3;
}
//每一列中每一行的具体内容
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    if (component==0)
    {
        switch (row) {
            case 0:
                return @"VIP专供";
            case 1:
                return @"VIP牧宝经典";
            default:
                break;
        }
    }
    else if(component==1)
    {
        if(com1==0)
        {
            switch (row) {
                case 0:
                    return @"手编垫";
                case 1:
                    return @"养生垫";
                case 2:
                    return @"四季垫";
                case 3:
                    return @"亚麻座垫";
                default:
                    break;
            }
        }
        else if(com1==1)
        {
            switch (row) {
                case 0:
                    return @"手编垫";
                case 1:
                    return @"养生垫";
                case 2:
                    return @"四季垫";
                default:
                    break;
            }
        }
    }
    else if(component==2)
    {
        if(com1==0)
        {
            if(com2==0)
            {
                switch (row) {
                    case 0:
                        return @"MY1301";
                    case 1:
                        return @"MY1302";
                    case 2:
                        return @"MY1303";
                    default:
                        break;
                }
            }
            return @" ";
        }
        if(com1==1)
        {
            if(com2==0)
            {
                switch (row) {
                    case 0:
                        return @"MY1305";
                    case 1:
                        return @"MY1306";
                    case 2:
                        return @"MY1315";
                    default:
                        break;
                }
            }
            if(com2==1)
            {
                switch (row) {
                    case 0:
                        return @"MBJ1301";
                    case 1:
                        return @"MBJ1302";
                    case 2:
                        return @"MBJ1303";
                    default:
                        break;
                }
            }
            if(com2==2)
            {
                switch (row) {
                    case 0:
                        return @"MSJ1301";
                    case 1:
                        return @"MSJ1302";
                    default:
                        break;
                }
            }
        }
    }
}
//返回组件的高度，如果这个方法未实现，选取器会自动调整到合适的高度
-(CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
{
    return 40;
}
//-(CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component
//{
//    if(component==0)
//    {
//        return 160;
//    }
//    return (m_picker.frame.size.width-160)/2;
//    
//}
//选中哪一列哪一行
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    if(component==0)
    {
        com1 = row;
    }
    else if(component==1)
    {
        com2=row;
    }
    [m_picker reloadAllComponents];
}