swift 设置navigationBar titleTextAttributes

swift 设置navigationBar titleTextAttributes 

	//设置navigationBar的背景图片
        let backgroundImage = UIImage(named: "navigation_bg")
        self.navigationBar.setBackgroundImage(backgroundImage, forBarMetrics: UIBarMetrics.Default)
        //字典KeyValue
        /*
        var attributesDic:Dictionary = {[
            NSFontAttributeName:UIFont(name: "Heiti SC", size: 24.0)!,
            NSForegroundColorAttributeName:UIColor.whiteColor()
            ]}()
        */
        //设置navigationBar的titleTextAttributes
        self.navigationBar.titleTextAttributes = {[
            NSForegroundColorAttributeName: UIColor.whiteColor(),
            NSFontAttributeName: UIFont(name: "Heiti SC", size: 24.0)!
            ]}()