在cell中重写load方法

+(void)load
{
    [XLFormViewController.cellClassesForRowDescriptorTypes setObject:[XLFormInlineSegmentedControl class] forKey:XLFormRowDescriptorTypeSegmentedControl];
}

XLFormRowDescriptor *customRowDescriptor = [XLFormRowDescriptor formRowDescriptorWithTag:kCustomRowText rowType:@"XLFormRowDescriptorTypeCustom"];
    // Must set custom cell or add custom cell to cellClassesForRowDescriptorTypes dictionary before XLFormViewController loaded
    customRowDescriptor.cellClass = [XLFormCustomCell class];
    [section addFormRow:customRowDescriptor];