How to disable cache in volt when development

Thank you,I ask, how to display code as above

I ran into a problem with this as well. Very ocassionally, Volt will fail to realize that a template file has changed, which can be frustrating in dev when you're changing things constantly. I solved it by adding this block to my service definition.

/**
 * Clear out the Volt cache dir on every request in debug mode.
 *
 * Volt appears to have no capacity to compile itself to memory; it always
 * needs to write its output to file and sometimes the engine doesn't
 * realize that a template has changed, so it doesn't re-compile it.
 */
if ($config->application->debugMode) {
  array_map('unlink', glob($config->application->cacheDir . 'volt/*.php'));
  $volt->setOptions(array(
    'compileAlways' => TRUE,
  ));
}

The accepted answer is great, I am just using bool for my config, as perhaps many of you are - explicit / positive

$volt = new VoltEngine($view, $this);

$voltOptions = [
  'compiledPath' => $config->application->cacheDir . 'volt/',
  'compiledSeparator' => '_'
];

if ($config->application->debug === true) {
    $voltOptions['compileAlways'] = true;
}

$volt->setOptions($voltOptions);