<?php
class Bootstrap extends Yaf_Bootstrap_Abstract {
 public function _initSmarty(Yaf_Dispatcher $dispatcher) {
  $smarty = new Smarty_Adapter(null, Yaf_Application::app()->getConfig()->smarty);
  Yaf_Dispatcher::getInstance()->setView($smarty);
 }
}

<?php
Yaf_Loader::import( "Smarty/libs/Smarty.class.php");
Yaf_Loader::import( "Smarty/libs/sysplugins/smarty_internal_templatecompilerbase.php");
Yaf_Loader::import( "Smarty/libs/sysplugins/smarty_internal_templatelexer.php");
Yaf_Loader::import( "Smarty/libs/sysplugins/smarty_internal_templateparser.php");
Yaf_Loader::import( "Smarty/libs/sysplugins/smarty_internal_compilebase.php");
Yaf_Loader::import( "Smarty/libs/sysplugins/smarty_internal_write_file.php");
class Smarty_Adapter implements Yaf_View_Interface
{
 /**
  * Smarty object
  * @var Smarty
  */
 public $_smarty;
 /**
  * Constructor
  *
  * @param string $tmplPath
  * @param array $extraParams
  * @return void
  */
 public function __construct($tmplPath = null, $extraParams = array()) {
  $this->_smarty = new Smarty;
  if (null !== $tmplPath) {
   $this->setScriptPath($tmplPath);
  }
  foreach ($extraParams as $key => $value) {
   $this->_smarty->$key = $value;
  }
 }
 /**
  * Return the template engine object
  *
  * @return Smarty
  */
 public function getEngine() {
  return $this->_smarty;
 }
 /**
  * Set the path to the templates
  *
  * @param string $path The directory to set as the path.
  * @return void
  */
 public function setScriptPath($path)
 {
  if (is_readable($path)) {
   $this->_smarty->template_dir = $path;
   return;
  }
  throw new Exception('Invalid path provided');
 }
 /**
  * Retrieve the current template directory
  *
  * @return string
  */
 public function getScriptPath()
 {
  return $this->_smarty->template_dir;
 }
 /**
  * Alias for setScriptPath
  *
  * @param string $path
  * @param string $prefix Unused
  * @return void
  */
 public function setBasePath($path, $prefix = 'Zend_View')
 {
  return $this->setScriptPath($path);
 }
 /**
  * Alias for setScriptPath
  *
  * @param string $path
  * @param string $prefix Unused
  * @return void
  */
 public function addBasePath($path, $prefix = 'Zend_View')
 {
  return $this->setScriptPath($path);
 }
 /**
  * Assign a variable to the template
  *
  * @param string $key The variable name.
  * @param mixed $val The variable value.
  * @return void
  */
 public function __set($key, $val)
 {
  $this->_smarty->assign($key, $val);
 }
 /**
  * Allows testing with empty() and isset() to work
  *
  * @param string $key
  * @return boolean
  */
 public function __isset($key)
 {
  return (null !== $this->_smarty->get_template_vars($key));
 }
 /**
  * Allows unset() on object properties to work
  *
  * @param string $key
  * @return void
  */
 public function __unset($key)
 {
  $this->_smarty->clear_assign($key);
 }
 /**
  * Assign variables to the template
  *
  * Allows setting a specific key to the specified value, OR passing
  * an array of key => value pairs to set en masse.
  *
  * @see __set()
  * @param string|array $spec The assignment strategy to use (key or
  * array of key => value pairs)
  * @param mixed $value (Optional) If assigning a named variable,
  * use this as the value.
  * @return void
  */
 public function assign($spec, $value = null) {
  if (is_array($spec)) {
   $this->_smarty->assign($spec);
   return;
  }
  $this->_smarty->assign($spec, $value);
 }
 /**
  * Clear all assigned variables
  *
  * Clears all variables assigned to Zend_View either via
  * {@link assign()} or property overloading
  * ({@link __get()}/{@link __set()}).
  *
  * @return void
  */
 public function clearVars() {
  $this->_smarty->clear_all_assign();
 }
 /**
  * Processes a template and returns the output.
  *
  * @param string $name The template to process.
  * @return string The output.
  */
 public function render($name, $value = NULL) {
  return $this->_smarty->fetch($name);
 }
 public function display($name, $value = NULL) {
  echo $this->_smarty->fetch($name);
 }
}

[common]
application.directory = APP_PATH "/application"
application.dispatcher.catchException = TRUE
application.view.ext="tpl"
[smarty : common]
;configures for smarty
smarty.left_delimiter = "{#"
smarty.right_delimiter = "#}"
smarty.template_dir  = APP_PATH "/application/views/"
smarty.compile_dir  = '/data1/www/cache/'
smarty.cache_dir  = '/data1/www/cache/'
[product : smarty]

public function twoAction() {
  $this->getView()->assign('content', 'hello World');
}

<html>
<head>
<title>A Smarty Adapter Example</title>
</head>
<body>
{#$content#}
</body>
</html>