iOS8开发～Swift（三）UI详解

来源：互联网发布：js将图片转换成base64 编辑：程序博客网时间：2024/04/28 03:00

一、概要

使用Swift来完成iOS的UI界面，其实现思想与OC实现几乎一致，只不过写法上有很大区别，个别控件较之前有较大改动。由于有纯代码强迫症，所以接下来创建一个纯代码动项目，然后在此基础上详细描述常用UI控件的Swift代码实现。

二、创建项目

首先创建一个新项目SwiftDemo，语言选择Swift，详情参考《 iOS8开发～Swift（一）入门》，然后打开项目plist文件，删除其中的Main storyboard file base name一行，其他内容不需要改动，程序会默认从AppDelegate.swift开始执行，但此时主window需要代码初始化，因为我们已经删除了storyboard，所以需要添加如下代码：

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {        // Override point for customization after application launch.        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)        self.window!.backgroundColor = UIColor.whiteColor()        self.window!.makeKeyAndVisible()                return true    }

现在程序应该可以运行了，不过什么内容都没有。

下面打算搭建一个很常见都项目框架，主window的rootviewController为一个

UITabBarController对象，UITabBarController对象作为容器，其有两个标签，每个标签的内容展示为一个

UINavigationController对象，UINavigationController对象的rootViewController为实际的用户界面，相信这个结构使用OC实现大家都很熟悉了，但使用Swift该怎么样实现呢，其实思想都是一样都，只不过写法有区别而已，下面详细讨论代码实现了。

三、UI实现详解

1、在应用程序启动函数中添加如下代码：其中 viewControllerA 和 viewControllerB是需新创建都两个视图控制器，具体实现参考《 iOS8开发～Swift（一）入门》

var window: UIWindow?    var tabBarController: UITabBarController?    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {        // Override point for customization after application launch.        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)        self.window!.backgroundColor = UIColor.whiteColor()                var viewControllerA = ViewControllerA();        viewControllerA.title = "基本UI"                var viewControllerB = ViewControllerB();        viewControllerB.title = "其他"                self.tabBarController = UITabBarController()        self.tabBarController!.delegate = self;        self.tabBarController!.viewControllers = [            UINavigationController(rootViewController: viewControllerA),            UINavigationController(rootViewController: viewControllerB)        ]        self.tabBarController!.selectedIndex = 0;                self.window!.rootViewController = self.tabBarController        self.window!.makeKeyAndVisible()                return true    }

这样，之前描述的项目框架就实现了。如果需要在UITabBarController的代理方法中做一些事情，可以实现其代理：

@UIApplicationMainclass AppDelegate: UIResponder, UIApplicationDelegate, UITabBarControllerDelegate

//UITabBarControllerDelegate    func tabBarController(tabBarController: UITabBarController!, didSelectViewController viewController: UIViewController!) {            }

运行效果：

2、以ViewControllerA作为UI介绍导航页面，在其中实现一个表视图TableView，其数据源从读取一个plist文件获取：

新建立一个ViewControllerA，取消勾选Xib选项，创建后重写loadView方法，然后初始化一个表视图，主要代码如下：

import UIKitclass ViewControllerA: UIViewController, UITableViewDelegate, UITableViewDataSource {        var list: NSArray?    var tableView: UITableView?        override func loadView() {        super.loadView()    }        override func viewDidLoad() {        super.viewDidLoad()               self.list = NSArray(contentsOfFile: NSBundle.mainBundle().pathForResource("BasicUI", ofType:"plist"))        println(self.list)                self.tableView = UITableView(frame: self.view.frame, style:UITableViewStyle.Plain)        self.tableView!.delegate = self        self.tableView!.dataSource = self        self.tableView!.registerClass(UITableViewCell.self, forCellReuseIdentifier: "Cell")        self.view?.addSubview(self.tableView)            }        func numberOfSectionsInTableView(tableView: UITableView!) -> Int {        return 1;    }        func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int {        return self.list!.count    }        func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell!    {        let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as UITableViewCell!        cell.accessoryType = UITableViewCellAccessoryType.DisclosureIndicator        cell.textLabel.text = self.list?.objectAtIndex(indexPath.row) as String                return cell    }        // UITableViewDelegate Methods    func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!)    {        self.tableView!.deselectRowAtIndexPath(indexPath, animated: true)                var itemString = self.list?.objectAtIndex(indexPath.row) as String                var viewController : UIViewController?        if itemString == "UIView" {            viewController = TheViewController()        } //省略部分代码        else {            println("viewController is nil")        }                viewController!.hidesBottomBarWhenPushed = true        self.navigationController.pushViewController(viewController, animated:true)    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()                // Dispose of any resources that can be recreated.    }}

实际运行效果

3、下面逐个介绍各个控件的实现

（1）UIView

import UIKitclass TheView: UIView {    override func drawRect(rect: CGRect) {        UIColor.redColor().setFill();        UIRectFill(CGRectMake(0, 100, 100, 100));    }}class TheViewController: UIViewController {    override func loadView() {        let theView = TheView()        theView.backgroundColor = UIColor.brownColor()        theView.layer.cornerRadius = 3        theView.layer.borderWidth = 5        theView.layer.borderColor = UIColor.darkGrayColor().CGColor                self.view = theView;    }    override func viewDidLoad() {        super.viewDidLoad()//        添加手势        let recognizer = UITapGestureRecognizer(target: self, action: "tapAction:")        recognizer.numberOfTapsRequired = 2;        recognizer.numberOfTouchesRequired = 1;        self.view.addGestureRecognizer(recognizer)    }        func tapAction(sender: UIGestureRecognizer)    {        println("tapAction")    }        override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

其中涉及到视图手势添加，视图重会，修改Layer等实现，效果如图：

（2）UILabel

import UIKitclass LabelViewController: UIViewController {    override func loadView() {        super.loadView();    }    override func viewDidLoad() {        super.viewDidLoad()        var label = UILabel(frame: CGRectMake(0, 100, self.view.bounds.size.width, 200))        label.backgroundColor = UIColor.blackColor()        label.textColor = UIColor.whiteColor()        label.numberOfLines = 0        label.lineBreakMode = NSLineBreakMode.ByWordWrapping        label.text = "Swift is designed to provide seamless compatibility with Cocoa and Objective-C. You can use Objective-C APIs (ranging from system frameworks to your own custom code) in Swift, and you can use Swift APIs in Objective-C. "        label.font = UIFont.italicSystemFontOfSize(20)                self.view.addSubview(label)    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

效果如图：

（3）UIButton

import UIKitclass ButtonViewController: UIViewController {    override func loadView() {        super.loadView();    }        override func viewDidLoad() {        super.viewDidLoad()        // Do any additional setup after loading the view.                var button = UIButton.buttonWithType(UIButtonType.System) as UIButton        button.frame = CGRect(x:100, y:200, width:100, height:100);        button.setTitleColor(UIColor.redColor(), forState: UIControlState.Normal)        button.setTitleColor(UIColor.greenColor(), forState:UIControlState.Selected)        button.setTitle("Normal", forState:UIControlState.Normal)        button.setTitle("Selected", forState:UIControlState.Selected)        button.setBackgroundImage(UIImage(named: "image.png"), forState:UIControlState.Normal)        button.tag = 1000;        button.clipsToBounds = true;        button.layer.cornerRadius = 5;        button.addTarget(self, action:"buttonAction:", forControlEvents:UIControlEvents.TouchUpInside)                self.view.addSubview(button)    }        func buttonAction(sender: UIButton) {        println("buttonAction")    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

运行效果：

（4）UIImageView 与 UIImage

import UIKitclass ImageViewController: UIViewController {    override func loadView() {        super.loadView();    }    override func viewDidLoad() {        super.viewDidLoad()        // Do any additional setup after loading the view.                var imageView = UIImageView(frame: CGRectMake(100, 100, 50, 50))        imageView.backgroundColor = UIColor.whiteColor();        imageView.animationImages = [            UIImage(contentsOfFile: NSBundle.mainBundle().pathForResource("bird-01", ofType:"png")),            UIImage(contentsOfFile: NSBundle.mainBundle().pathForResource("bird-02", ofType:"png")),            UIImage(contentsOfFile: NSBundle.mainBundle().pathForResource("bird-03", ofType:"png")),            UIImage(named: "bird-04.png")        ]        imageView.contentMode = UIViewContentMode.ScaleAspectFit        imageView.animationDuration = 1;        imageView.startAnimating()                self.view.addSubview(imageView)    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

运行效果，这是一个图片动画：

（5）UITextField

import UIKitclass TextFieldViewController: UIViewController, UITextFieldDelegate {    override func loadView() {        super.loadView();    }    override func viewDidLoad() {        super.viewDidLoad()                NSNotificationCenter.defaultCenter().addObserver(self, selector: "textFieldTextDidBeginEditingNotification:", name:UITextFieldTextDidBeginEditingNotification, object:nil)                var textField = UITextField(frame: CGRectMake(10, 100, 300, 40))        textField.backgroundColor = UIColor.clearColor()        textField.textColor = UIColor.blackColor()        textField.placeholder = "请输入..."        textField.borderStyle = UITextBorderStyle.RoundedRect        textField.adjustsFontSizeToFitWidth = true        textField.delegate = self                self.view.addSubview(textField)    }        func textFieldTextDidBeginEditingNotification(sender: NSNotification!) {            }    //    UITextFieldDelegate    func textFieldShouldBeginEditing(textField: UITextField!) -> Bool {        return true;    }        func textFieldDidBeginEditing(textField: UITextField!) {    }        func textFieldShouldEndEditing(textField: UITextField!) -> Bool {        return true;    }        func textFieldDidEndEditing(textField: UITextField!) {    }        func textField(textField: UITextField!, shouldChangeCharactersInRange range: NSRange, replacementString string: String!) -> Bool {        return true;    }        func textFieldShouldReturn(textField: UITextField!) -> Bool {        return true;    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

运行效果：

（6）UITextView

import UIKitclass TextViewController: UIViewController, UITextViewDelegate {    override func loadView() {        super.loadView();    }    override func viewDidLoad() {        super.viewDidLoad()        var textView = UITextView(frame:CGRectMake(10.0, 120.0, 300.0, 400.0))        textView.backgroundColor = UIColor.blackColor()        textView.textColor = UIColor.whiteColor()        textView.editable = false        textView.font = UIFont.boldSystemFontOfSize(30)        textView.delegate = self;        textView.text = "Swift is designed to provide seamless compatibility with Cocoa and Objective-C. You can use Objective-C APIs (ranging from system frameworks to your own custom code) in Swift, and you can use Swift APIs in Objective-C. "        self.view.addSubview(textView)    }        func textViewShouldBeginEditing(textView: UITextView!) -> Bool {        return true;    }        func textViewShouldEndEditing(textView: UITextView!) -> Bool {        return true;    }        func textViewDidBeginEditing(textView: UITextView!) {    }        func textViewDidEndEditing(textView: UITextView!) {    }        func textView(textView: UITextView!, shouldChangeTextInRange range: NSRange, replacementText text: String!) -> Bool {        return true;    }        func textViewDidChange(textView: UITextView!) {    }        func textViewDidChangeSelection(textView: UITextView!) {    }        func textView(textView: UITextView!, shouldInteractWithURL URL: NSURL!, inRange characterRange: NSRange) -> Bool {        return true;    }        func textView(textView: UITextView!, shouldInteractWithTextAttachment textAttachment: NSTextAttachment!, inRange characterRange: NSRange) -> Bool {        return true;    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

运行效果：

（7）UISwitch

import UIKitclass SwitchViewController: UIViewController {    override func loadView() {        super.loadView();    }    override func viewDidLoad() {        super.viewDidLoad()        var switchCtr = UISwitch(frame: CGRectMake(100, 100, 80, 30))        switchCtr.on = true        switchCtr.addTarget(self, action: "switchAction:", forControlEvents:UIControlEvents.ValueChanged)        self.view.addSubview(switchCtr)    }        func switchAction(sender: UISwitch) {        println("switchAction")    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

运行效果：

（8）UIScrollView

import UIKitclass ScrollViewController: UIViewController, UIScrollViewDelegate {    override func loadView() {        super.loadView();    }    override func viewDidLoad() {        super.viewDidLoad()        var scroll = UIScrollView(frame: self.view.bounds)        scroll.pagingEnabled = true        scroll.scrollEnabled = true        scroll.showsVerticalScrollIndicator = true        scroll.showsHorizontalScrollIndicator = true        scroll.delegate = self                var X : CGFloat = 0        for (var i = 0; i < 2; i++) {            var label = UILabel()            label.text = "\(i)"            label.textAlignment = NSTextAlignment.Center            label.backgroundColor = UIColor.lightGrayColor()            label.frame = CGRectMake(X, 0, self.view.bounds.size.width, self.view.bounds.size.height)            X += 320            scroll.addSubview(label)        }                scroll.contentSize = CGSizeMake(2 * self.view.bounds.size.width, self.view.bounds.size.height)                self.view.addSubview(scroll)    }    //    UIScrollViewDelegate    func scrollViewDidScroll(scrollView: UIScrollView!) {        println("scrollViewDidScroll")    }        func scrollViewWillBeginDragging(scrollView: UIScrollView!) {    }        func scrollViewWillEndDragging(scrollView: UIScrollView!, withVelocity velocity: CGPoint, targetContentOffset: CMutablePointer<CGPoint>) {    }        func scrollViewDidEndDragging(scrollView: UIScrollView!, willDecelerate decelerate: Bool) {           }        func scrollViewWillBeginDecelerating(scrollView: UIScrollView!) {    }        func scrollViewDidEndDecelerating(scrollView: UIScrollView!) {    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

运行效果：

（9）UIPageView

import UIKitclass PageControlViewController: UIViewController {    override func loadView() {        super.loadView()    }    override func viewDidLoad() {        super.viewDidLoad()        var pageControl = UIPageControl(frame: CGRectMake(100, 100, 100, 100));        pageControl.numberOfPages = 10        pageControl.currentPage = 5        pageControl.currentPageIndicatorTintColor = UIColor.grayColor()        pageControl.pageIndicatorTintColor = UIColor.redColor()        pageControl.addTarget(self, action: "pageControlAction:", forControlEvents:UIControlEvents.ValueChanged)                self.view.addSubview(pageControl)    }        func pageControlAction(sender: UIPageControl) {        println("pageControlAction:\(sender.currentPage)")    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

效果如图：

（10）UIAlertView 与 UIActionSheet

import UIKitclass AlertViewController: UIViewController {    override func loadView() {        super.loadView()    }        override func viewDidAppear(animated: Bool) {                let alertController = UIAlertController(title: "title", message: "message", preferredStyle: UIAlertControllerStyle.Alert)        //        let alertController = UIAlertController(title: "title", message: "message", preferredStyle: UIAlertControllerStyle.ActionSheet)                let cancelAction = UIAlertAction(title: "cancel", style: UIAlertActionStyle.Cancel) { action in            println("cancel")        }                let otherAction = UIAlertAction(title: "other", style: UIAlertActionStyle.Default) { action in            NSLog("other")        }                let secondAction = UIAlertAction(title: "secondAction", style: UIAlertActionStyle.Default) { action in            NSLog("secondAction")        }                alertController.addAction(cancelAction)        alertController.addAction(otherAction)        alertController.addAction(secondAction)                presentViewController(alertController, animated: true, completion: nil)    }    override func viewDidLoad() {        super.viewDidLoad()                    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

运行效果：

（11）UIActivityIndicatorView

import UIKitclass ActivityIndicatorViewController: UIViewController {    override func loadView() {        super.loadView()    }        override func viewDidAppear(animated: Bool) {                var activity = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.Gray)        activity.frame = CGRectMake(100, 100, 40, 40)        activity.startAnimating()        activity.hidesWhenStopped = true                self.view.addSubview(activity)    }    override func viewDidLoad() {        super.viewDidLoad()    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }    }

运行效果：

（12）UISlider

import UIKitclass SliderViewController: UIViewController {    override func loadView() {        super.loadView()    }    override func viewDidLoad() {        super.viewDidLoad()        var slider = UISlider(frame:CGRectMake(10.0, 150.0, 300.0, 30.0))        slider.addTarget(self, action:"sliderAction:", forControlEvents:UIControlEvents.ValueChanged)        self.view.addSubview(slider)    }        func sliderAction(sender: UISlider) {        println("sliderAction:\(sender.value)")    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

运行效果：

（13）UIProgressView

import UIKitclass ProgressViewController: UIViewController {    override func loadView() {        super.loadView()    }        override func viewDidAppear(animated: Bool) {        var progress = UIProgressView(progressViewStyle:UIProgressViewStyle.Default)        progress.progressTintColor = UIColor.blackColor()        progress.trackTintColor  = UIColor.redColor()        progress.frame = CGRectMake(10.0, 150.0, 300.0, 40.0)        progress.setProgress(0.9, animated: true)        self.view.addSubview(progress)    }    override func viewDidLoad() {        super.viewDidLoad()    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

效果如图：

（14）UISegmentedControl

import UIKitclass SegmentedViewController: UIViewController {    override func loadView() {        super.loadView()    }    override func viewDidLoad() {        super.viewDidLoad()        var segment = UISegmentedControl(items:["one", "two", "three", "four"])        segment.frame = CGRectMake(10.0, 110.0, 300.0, 30.0)        segment.segmentedControlStyle = UISegmentedControlStyle.Bordered        segment.momentary = true        segment.addTarget(self, action:"segmentAction:", forControlEvents:UIControlEvents.TouchUpInside)                self.view.addSubview(segment)    }        func segmentAction(sender: UISegmentedControl) {        println("segmentAction")    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

实现效果：

（15）UIDatePicker

import UIKitclass DatePickerViewController: UIViewController {    override func loadView() {        super.loadView()    }    override func viewDidLoad() {        super.viewDidLoad()                var datePicker = UIDatePicker(frame:CGRectMake(0.0, 120.0, 200.0, 200.0))        datePicker.datePickerMode = UIDatePickerMode.DateAndTime        datePicker.minimumDate = NSDate.date()        datePicker.minuteInterval = 1        datePicker.addTarget(self, action: "action", forControlEvents: UIControlEvents.ValueChanged)                self.view.addSubview(datePicker)    }        func action() {        println("action")    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

实现效果：

（16）UIWebView

import UIKitclass WebViewController: UIViewController, UIWebViewDelegate {    override func loadView() {        super.loadView()    }    override func viewDidLoad() {        super.viewDidLoad()        var webView = UIWebView(frame: self.view.bounds)        webView.backgroundColor = UIColor.whiteColor()        webView.scalesPageToFit = true        webView.delegate = self;                var url = NSURL(string: "http://www.baidu.com")        var request = NSURLRequest(URL: url)                webView.loadRequest(request)                self.view.addSubview(webView)    }    //    UIWebViewDelegate    func webViewDidStartLoad(webView: UIWebView) {        UIApplication.sharedApplication().networkActivityIndicatorVisible = true    }        func webViewDidFinishLoad(webView: UIWebView) {        UIApplication.sharedApplication().networkActivityIndicatorVisible = false    }        func webView(webView: UIWebView, didFailLoadWithError error: NSError) {        println("didFailLoadWithError")        UIApplication.sharedApplication().networkActivityIndicatorVisible = false    }    func textFieldShouldReturn(textField: UITextField) -> Bool {        textField.resignFirstResponder()        return true    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

实现效果：

（17）UIToolbar

import UIKitclass ToolbarViewController: UIViewController {    override func loadView() {        super.loadView()    }    override func viewDidLoad() {        super.viewDidLoad()        var toolBar = UIToolbar(frame:CGRectMake(10.0, 120.0, 300.0, 30.0))        toolBar.barStyle = .BlackTranslucent        toolBar.tintColor = UIColor.greenColor()        toolBar.backgroundColor = UIColor.blueColor()                var flexibleSpace = UIBarButtonItem(barButtonSystemItem:UIBarButtonSystemItem.FlexibleSpace, target:"barButtonItemClicked:", action:nil)        var barBtnItemA = UIBarButtonItem(title: "one", style:UIBarButtonItemStyle.Plain, target:self, action:"barButtonItemClicked:")        var barBtnItemB = UIBarButtonItem(title: "two", style:UIBarButtonItemStyle.Plain, target:self, action:"barButtonItemClicked:")        var barBtnItemC = UIBarButtonItem(title: "three", style:UIBarButtonItemStyle.Plain, target:self, action:"barButtonItemClicked:")        var barBtnItemD = UIBarButtonItem(title: "four", style:UIBarButtonItemStyle.Plain, target:self, action:"barButtonItemClicked:")                toolBar.items = [flexibleSpace, barBtnItemA, flexibleSpace, barBtnItemB, flexibleSpace, barBtnItemC, flexibleSpace, barBtnItemD, flexibleSpace]                self.view.addSubview(toolBar)    }        func barButtonItemClicked(sender: UIBarButtonItem) {        NSLog("barButtonItemClicked: \(sender)")    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

实现效果：

（18）UISearchBar

import UIKitclass SearchBarViewController: UIViewController, UISearchBarDelegate {    override func loadView() {        super.loadView()    }        override func viewDidLoad() {        super.viewDidLoad()        var searchBar = UISearchBar(frame:CGRectMake(0, 60.0, 320.0, 100.0))        searchBar.showsCancelButton = true        searchBar.searchBarStyle = UISearchBarStyle.Default        searchBar.showsScopeBar = true        searchBar.scopeButtonTitles = [            "scope A",            "scope B"        ]                self.view.addSubview(searchBar)    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }    //    UISearchBarDelegate    func searchBar(UISearchBar, selectedScopeButtonIndexDidChange selectedScope: Int) {        println("selectedScopeButtonIndexDidChange \(selectedScope)")    }        func searchBarSearchButtonClicked(searchBar: UISearchBar) {        println("searchBarSearchButtonClicked: \(searchBar.text)")                searchBar.resignFirstResponder()    }        func searchBarCancelButtonClicked(searchBar: UISearchBar) {        println("searchBarCancelButtonClicked")        searchBar.resignFirstResponder()    }}

实现效果：

到这里基本常用到UI控件实现的Swift版本就搞定啦，当然实际项目中需要更灵活、更复杂的实现，这些代码仅供参考，希望有抛砖引玉的效果！更多内容请点击这里

Demo下载：http://download.csdn.net/detail/zfpp25_/7463851

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