Swift 首页导航 图片滑动

1.在AppDelegate中判断是否第一次进入，更换根视图

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
if(!NSUserDefaults.standardUserDefaults().boolForKey("firstLaunch"))
{
NSUserDefaults().setBool(true, forKey: "firstLaunch")
NSLog("first lanuch")
var vc : WelcomeController = WelcomeController()
self.window?.rootViewController = vc
}
else{
NSLog("not first lanuch")
var navC = ViewController()
//获取名为Main.storyboard的文件
var storyboard = UIStoryboard(name: "Main", bundle:nil)
self.window?.rootViewController = storyboard.instantiateViewControllerWithIdentifier("MainController") as? UINavigationController
}
self.window?.backgroundColor = UIColor.whiteColor()
self.window?.makeKeyAndVisible()
return true
}

2.在WelcomeController页面中设置相对应的布局

//页面布局
func setUI()
{
var scrollView = UIScrollView(frame: CGRectMake(0, 0, 320, 640))
scrollView.contentSize = CGSizeMake(960, 0)
scrollView.pagingEnabled = true
var imageView1 = UIImageView(frame: CGRectMake(0, 0, 320, 640))
imageView1.image = UIImage(named: "top_image1")
scrollView.addSubview(imageView1)
var imageView2 = UIImageView(frame: CGRectMake(320, 0, 320, 640))
imageView2.image = UIImage(named: "top_image2")
scrollView.addSubview(imageView2)
var imageView3 = UIImageView(frame: CGRectMake(640, 0, 320, 640))
imageView3.image = UIImage(named: "top_image3")
imageView3.userInteractionEnabled = true
scrollView.addSubview(imageView3)
var button :UIButton = UIButton()
button.setTitle("跳转", forState: UIControlState.Normal)
button.frame = CGRectMake(46, 371, 230, 37)
//为button添加点击事件
button.addTarget(self, action: "firstpressed", forControlEvents: UIControlEvents.TouchUpInside)
imageView3.addSubview(button)
var page = UIPageControl(frame: CGRectMake(135, 600, 50, 20))
page.numberOfPages = 3
scrollView.addSubview(page)
self.view.addSubview(scrollView)
}

3.为按钮添加点击事件

func firstpressed()
{
//若在AppDelegate中self.windows.rootviewcontroller = WelcomeController()则
// var nav = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("MainController") as? UINavigationController

//若var vc = storyboard.instantiateViewControllerWithIdentifier("welcomeController") as? UIViewController
// self.window?.rootViewController = vc ,则

var nav = self.storyboard?.instantiateViewControllerWithIdentifier("MainController") as? UINavigationController
self.presentViewController(nav!, animated: false, completion: nil)
}