storyboard创建的选项卡，图片颜色固定，字体颜色固定。可以说完全没法用，查阅了好久的api和资料才找到修改的办法。

将UITabBarItem连线到FirstViewController

代码如下：

//
//  FirstViewController.swift
//  demo
//
//  Created by sunger on 15/3/24.
//  Copyright (c) 2015年 sunger. All rights reserved.
//

import UIKit

class FirstViewController: UIViewController {
    @IBOutlet weak var tab1: UITabBarItem!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view,typically from a nib.
        //这里修改图片颜色，使得图片和原图颜色一致
        tab1.image=UIImage(named: "tab1")?.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal);
        //这里修改字体颜色
        var attributes =  [NSForegroundColorAttributeName: UIColor(red: 220.0/255.0,green: 104.0/255.0,blue: 1.0/255.0,alpha: 1.0),NSFontAttributeName: UIFont(name: "Heiti SC",size: 24.0)!]
        tab1.setTitleTextAttributes(attributes,forState: UIControlState.Selected)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

1.修改图片颜色

2.修改字体颜色

http://www.cnblogs.com/xgbzsc/archive/2013/01/16/2862611.html

http://blog.csdn.net/willyang519/article/details/38855719

http://stackoverflow.com/questions/7810563/how-do-you-use-settitletextattributesforstate-in-uibaritem

最后实现如下效果