我正在尝试更改未选中的UITabBarItems的默认灰色。我设法改变了文字而不是图像。
TabBar.appearance().barTintColor = UIColor(red: 86.0/255.0, green: 132.0/255.0, blue: 208.0/255.0, alpha: 1.0)
var normalTint: UIColor = UIColor.whiteColor()
TabBar.appearance().tintColor = UIColor.whiteColor()
UITabBarItem.appearance().setTitleTextAttributes([NSForegroundColorAttributeName: normalTint,NSFontAttributeName: UIFont(name: "Arial", size: 13)!], forState: UIControlState.Normal)