通过Swift设置ios下NavigationBar颜色字体的方法

• 设置UINavigationBar背景颜色
  UINavigationBar.appearance().barTintColor = UIColor(red: 36.0/255.0, green: 190.0/255.0, blue: 139.0/255.0, alpha: 1.0)
• 设置UINavigationBar文本颜色
  var attr: NSMutableDictionary! = [NSForegroundColorAttributeName: UIColor(red: 255.0/255.0, green: 255.0/255.0, blue: 255.0/255.0, alpha: 1.0)]
• 设置UINavigationBar字体
  attr.setValue(UIFont(name: "AmericanTypewriter", size: 16.0), forKey: NSFontAttributeName)
• 设置UINavigationBar文本阴影
  var shadow = NSShadow()
  shadow.shadowColor = UIColor(red: 1.0, green: 0.0, blue: 0.0, alpha: 1.0)
  shadow.shadowOffset = CGSizeMake(0, 1)
  attr.setValue(shadow, forKey: NSShadowAttributeName)
  UINavigationBar.appearance().titleTextAttributes = attr