iOS8开发～Swift（三）UI详解
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：
@UIApplicationMain
class 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 UIKit
class 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 UIKit
class 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 UIKit
class 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 UIKit
class 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 UIKit
class 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 UIKit
class 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 UIKit
class 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 UIKit
class 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 UIKit
class 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) {
}
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 UIKit
class 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 UIKit
class 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 UIKit
class 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 UIKit
class 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 UIKit
class 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 UIKit
class 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 UIKit
class 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 UIKit
class 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 UIKit
class 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 UIKit
class 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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