如何格式化 XLForm 行值

How to format an XLForm row value

我在我的项目中使用 XLForm 并希望以特定格式显示其中一行的值。

该行是 "Annual turnover",我想将用户输入的值显示为货币 - 例如,如果用户在表单字段中输入 1000000 ,该字段应更新为显示:$ 1,000,000.00

我该怎么做?

这是在 initializeForm() 中初始化表单字段的方式:

-(void)initializeForm
{

    // Other fields in the form...

    // Annual turnover Section
    self.section = [XLFormSectionDescriptor formSectionWithTitle:formLabel8AnnualTurnover];
    //section.footerTitle = @"Describe new products";
    [self.formDescriptor addFormSection:self.section];

    // Annual turnover
    self.row = [XLFormRowDescriptor formRowDescriptorWithTag:formField8AnnualTurnover rowType:XLFormRowDescriptorTypeText title:nil];
    self.row.required = NO;
    rowDescriptor8AnnualTurnover = self.row;
    [self.section addFormRow:self.row];

    // Other fields in the form...

    self.form = self.formDescriptor;

}

根据the documentation,我应该捕捉到用户已经与字段交互,然后更改字段的值并更新行。

这就是我发现用户在字段中输入内容的方式:

-(void)formRowDescriptorValueHasChanged:(XLFormRowDescriptor *)rowDescriptor oldValue:(id)oldValue newValue:(id)newValue
{
        [super formRowDescriptorValueHasChanged:rowDescriptor oldValue:oldValue newValue:newValue];

        // Get the current form values
        formValues = [self.form formValues];

        int i = 0;

        if ([rowDescriptor.tag hasPrefix:formField8AnnualTurnover]){
                NSString *annualTurnoverValue = [(XLFormOptionsObject*)formValues[formField8AnnualTurnover] displayText];
                rowDescriptor8AnnualTurnover.value = [NSString stringWithFormat:@"R %@", annualTurnoverValue]; //This breaks.
                [self reloadFormRow:rowDescriptor8AnnualTurnover];
            }    
}

通过重置 formRowDescriptorValueHasChanged 中的 rowDescriptor 的值创建了一个无限循环。

我通过更改 formRowDescriptorValueHasChanged 解决了这个问题,首先检查 rowDescriptor 的值是否已经以货币符号开头,只有在缺少时才添加它:

-(void)formRowDescriptorValueHasChanged:(XLFormRowDescriptor *)rowDescriptor oldValue:(id)oldValue newValue:(id)newValue
{

   [super formRowDescriptorValueHasChanged:rowDescriptor oldValue:oldValue newValue:newValue];

   // Get the current form values
   formValues = [self.form formValues];
   if ([rowDescriptor.tag hasPrefix:formField8AnnualTurnover]){
        NSString *annualTurnoverValue = [(XLFormOptionsObject*)formValues[formField8AnnualTurnover] displayText];
        if([annualTurnoverValue hasPrefix:@"R "]){
            // Do nothing - the value will simply be increased.
        }else{
            rowDescriptor8AnnualTurnover.value = [NSString stringWithFormat:@"R %@", annualTurnoverValue];
            [self reloadFormRow:rowDescriptor8AnnualTurnover];
        }            
    }    
}