前几话我们在程序中增加了一个顶部的导航栏，今天我们想要在底部增加一些功能，增加一个share和一个review的按钮。在DetailViewController中增加一个toolBar用来放置功能按钮，设置两个全局变量，表示功能栏的宽和高：

let  tooBarHeight:CGFloat = 44
let tooBarWidth:CGFloat = 320

然后在viewDidLoad方法中添加我们的toolBar：

 var toolBarY:CGFloat = self.view.frame.size.height - tooBarHeight
        var toolBar = UIToolbar(frame: CGRectMake(0,toolBarY,tooBarWidth,tooBarHeight))
        self.view.addSubview(toolBar)

上述代码可以保证toolBar的位置在底部。效果如图：

然后向工具栏中添加我们需要的按钮：

let shareButton = UIButton(frame: CGRectMake(60, 0, 80, 44))
        shareButton.setTitle("Share", forState: .Normal)
        shareButton.setTitleColor(UIColor.orangeColor(), forState: .Normal)
        shareButton.addTarget(self, action: "clickShare:", forControlEvents: .TouchUpInside)
        shareButton.tag = 101
        toolBar.addSubview(shareButton)
        
        let reviewButton = UIButton(frame: CGRectMake(210, 0, 80, 44))
        reviewButton.setTitle("Review", forState: .Normal)
        reviewButton.setTitleColor(UIColor.orangeColor(), forState: .Normal)
        reviewButton.addTarget(self, action: "clickReview:", forControlEvents: .TouchUpInside)
        reviewButton.tag = 102
        toolBar.addSubview(reviewButton)

我们给每个按钮打了一个标签，现在来简单实现一下试试有没有关联到，action方法定义如下：

  func clickShare(sender: UIButton){
    }
    
    func clickReview(sender: UIButton){
    print(sender.tag)
    }

点击按钮Review，控制台打印出了102，证明关联成功了，现在我们重新来写action方法。

func clickReview(sender: UIButton){
    let review = ReviewViewController()
        self.presentViewController(review, animated: true, completion: nil )//临时展示一个控制器
    }

我们定义了一个新的控制器ReviewViewController用来展示点击clickReview后跳出的页面，代码如下：

import UIKit

class ReviewViewController: UIViewController {
    var imageView: UIImageView!
    override func viewDidLoad() {
        super.viewDidLoad()

  self.view.backgroundColor = UIColor.orangeColor()
        imageView = UIImageView(frame: self.view.bounds)
        imageView.image = UIImage(named: "128.png")
        self.view.addSubview(imageView)
        var blur = UIBlurEffect(style: .Dark)//模糊
        var blurView = UIVisualEffectView(effect: blur)//模糊
        blurView.frame = self.view.bounds//模糊
        imageView.addSubview(blurView)//模糊
    }

}

上面这段代码实现了一个模糊图片的效果，下面我把下面四段代码注释掉来展示下如果只显示图片的效果，点击Review按钮，效果如下：

开启模糊模式之后的效果如图：

在这个页面添加一个取消的按钮：

//closeButton
        var closeButton = UIButton(frame: CGRectMake(280, 30, 30, 30))
        closeButton.setBackgroundImage(UIImage(named: "Button-Close"), forState: .Normal)
        closeButton.layer.cornerRadius = 15
        closeButton.layer.masksToBounds = true
        closeButton.addTarget(self, action: "clickCloseBtn:", forControlEvents: .TouchUpInside)
        self.view.addSubview(closeButton)

点击后返回上一个页面：

在图片上增加一些字吧：

let label = UILabel(frame: CGRectMake(0, 100, 320, 200))
        label.text = "You've dinned here.\n What do you \n think?"
        label.textAlignment = NSTextAlignment.Center
        label.textColor = UIColor.whiteColor()
        label.numberOfLines = 0
        label.font = UIFont.systemFontOfSize(30)
        self.view.addSubview(label)

效果如图：

我们添加三个评价按钮，代码如下：

//three buttons
        let baddge:CGFloat = 40
        let buttonWidth:CGFloat = 60
        let buttonY:CGFloat = 300 //三个按钮相同的规格
        let firstBtn = UIButton(frame: CGRectMake(baddge, buttonY, buttonWidth, buttonWidth))
        firstBtn.setBackgroundImage(UIImage(named: "happy"), forState: .Normal)
        self.view.addSubview(firstBtn)
        
        let secondBtn = UIButton(frame: CGRectMake(135, buttonY, buttonWidth, buttonWidth))
        secondBtn.setBackgroundImage(UIImage(named: "glad"), forState: .Normal)
        self.view.addSubview(secondBtn)
        
        let thirdBtn = UIButton(frame: CGRectMake(225, buttonY, buttonWidth, buttonWidth))
        thirdBtn.setBackgroundImage(UIImage(named: "angry"), forState: .Normal)
        self.view.addSubview(thirdBtn)

效果如图：