引言
UIScrollView在實(shí)際的項(xiàng)目開發(fā)中使用的比較多，可以很好展示圖片
說下思路，根據(jù)APP的版本來決定是否顯示新特性界面，如果版本號(hào)和當(dāng)前版本號(hào)不同就顯示新特性界面，否則直接進(jìn)入主界面
- 在項(xiàng)目中先創(chuàng)建2個(gè)控制器，MainViewController和NewFeatureViewController，定義兩個(gè)變量放當(dāng)前的版本號(hào)和存儲(chǔ)的版本號(hào)
var currontVersonCode : String? = ""
var lastVersonCode :String? = ""
//kCFBundleVersionKey 是info.plist文件表示版本號(hào)的Key
var key = kCFBundleVersionKey as String
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
//創(chuàng)建窗口
self.window = UIWindow(frame :UIScreen.mainScreen().bounds)
Main = MainViewController()
NewFeature = NewFeatureViewController()
//去沙盒取版本號(hào)
lastVersonCode = NSUserDefaults.standardUserDefaults().stringForKey(key)
//加載程序中的info.plist文件
currontVersonCode = (NSBundle.mainBundle().infoDictionary![key]) as? String
if lastVersonCode == currontVersonCode{
UIApplication.sharedApplication().statusBarHidden = false
self.window?.rootViewController = Main
}else{
//保存當(dāng)前版本號(hào)
self.window?.rootViewController = NewFeature
NSUserDefaults.standardUserDefaults().setObject(currontVersonCode as? AnyObject, forKey: key)
//立即保存
NSUserDefaults.standardUserDefaults().synchronize()
}
return true
}
- 新特性界面實(shí)現(xiàn)
來到我們創(chuàng)建的NewFeatureViewController中,思路是創(chuàng)建一個(gè)UIImage設(shè)置一個(gè)圖片為背景，然后創(chuàng)建UIScrollView在UIImageView上，利用for循環(huán)將圖片一張一張?zhí)砑拥経IScrollView中，第二張圖片的X為第一張圖片的寬度，這樣就不難理解了
import UIKit
let kCount = 4
class NewFeatureViewController: UIViewController,UIScrollViewDelegate{
var Main :MainViewController!
var imageView :UIImageView!
var scrollView :UIScrollView!
override func loadView() {
imageView = UIImageView()
imageView.frame = UIScreen.mainScreen().bounds
print(UIScreen.mainScreen().bounds)
imageView?.image = UIImage(named: "new_feature_background.png")
self.view = imageView
self.imageView.userInteractionEnabled = true
}
override func viewDidLoad() {
super.viewDidLoad()
let viewSize = self.view.bounds
//創(chuàng)建scrollView
scrollView = UIScrollView()
scrollView.delegate = self
scrollView.frame = self.view.bounds
print(self.view.bounds.width)
scrollView.contentSize = CGSizeMake( self.view.bounds.width * CGFloat(kCount), 0)
scrollView.showsHorizontalScrollIndicator = false
scrollView.pagingEnabled = true
for i in 0..<kCount {
self.addImageViewAtIndex(i)
}
imageView.addSubview(scrollView)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//添加圖片
func addImageViewAtIndex(Index:Int)
{
let viewSize = self.view.bounds.size
let imageView :UIImageView = UIImageView()
imageView.frame = CGRectMake(viewSize.width * CGFloat(Index), 0,viewSize.width, viewSize.height)
imageView.image = UIImage(named: "new_feature_\(Index+1).png")
scrollView.addSubview(imageView)
}
}
- 添加PageController
定義一個(gè)PageController
var pageView : UIPageControl!
把pageController添加到UIScrollView里去
//創(chuàng)建pageControl
pageView = UIPageControl()
pageView.center = CGPointMake(viewSize.width * 0.5, viewSize.height * 0.95)
pageView.bounds = CGRectMake(0, 0, 100, 0)
pageView.numberOfPages = kCount
pageView.currentPageIndicatorTintColor = UIColor.blackColor()
pageView.pageIndicatorTintColor = UIColor.lightGrayColor()
imageView.addSubview(pageView)
UIPageControl同步顯示
func scrollViewDidEndDecelerating(scrollView: UIScrollView) {
pageView.currentPage = Int(scrollView.contentOffset.x) / Int(scrollView.frame.size.width)
}
看下效果圖
第一張
拖動(dòng)時(shí)的效果圖
-
在UIScrollView上添加按鈕
最后一張圖
分享按鈕普通狀態(tài)和選中狀態(tài)分別為不同的圖片
立即體驗(yàn)按鈕普通狀態(tài)和按住狀態(tài)分別為不同的圖片
func addButton()
{
let viewSize = self.view.bounds.size
let loginBtn : UIButton = UIButton()
let shareBtn : UIButton = UIButton()
var loginNormalImage :UIImage = UIImage()
var loginHeigtImage : UIImage = UIImage()
var shareNormalImage :UIImage = UIImage()
var shareHeigtImage : UIImage = UIImage()
loginNormalImage = UIImage(named:"new_feature_finish_button.png" )!
loginHeigtImage = UIImage(named: "new_feature_finish_button_highlighted.png")!
shareNormalImage = UIImage(named: "new_feature_share_true")!
shareHeigtImage = UIImage(named: "new_feature_share_false")!
loginBtn.center = CGPointMake(viewSize.width * 3.5, viewSize.height * 0.85)
loginBtn.bounds = CGRectMake(0, 0, loginNormalImage.size.width-20, loginNormalImage.size.height)
loginBtn.setImage(loginNormalImage, forState: UIControlState.Normal)
loginBtn.setImage(loginHeigtImage, forState: UIControlState.Highlighted)
loginBtn.addTarget(self, action: Selector("start"), forControlEvents: .TouchUpInside)
scrollView.addSubview(loginBtn)
shareBtn.center = CGPointMake(viewSize.width * 3.5, viewSize.height * 0.75)
shareBtn.bounds = CGRectMake(0, 0, shareNormalImage.size.width, shareNormalImage.size.height)
shareBtn.setImage(shareNormalImage, forState: UIControlState.Normal)
shareBtn.setImage(shareHeigtImage, forState: UIControlState.Selected)
shareBtn.addTarget(self, action: Selector("share:"), forControlEvents: .TouchUpInside)
scrollView.addSubview(shareBtn)
}
設(shè)置完成之后將按鈕添加到UIScrollView中，并在添加圖片的for循環(huán)中設(shè)置判斷語句，當(dāng)在第四張圖的時(shí)候調(diào)用addButton方法
if i == 3{
self.addButton()
}
對(duì)于分享按鈕反復(fù)點(diǎn)擊切換不同狀態(tài)，加上下面代碼就可以實(shí)現(xiàn)了
func share(btn:UIButton) {
btn.selected = !btn.selected
}
總結(jié)
對(duì)于UIScrollView使用還是比較簡(jiǎn)單的，我覺得還可以擴(kuò)展一下，例如UIScrollView的無限循環(huán)，還有淘寶等首頁的自動(dòng)換頁。最后希望能給大家?guī)韼椭黄疬M(jìn)步。
