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Example of UIPageViewController without storyboard i.e. created programmatically
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// derived from https://www.veasoftware.com/posts/uipageviewcontroller-in-swift-xcode-62-ios-82-tutorial | |
import UIKit | |
@UIApplicationMain | |
class AppDelegate: UIResponder, UIApplicationDelegate { | |
var window: UIWindow? | |
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { | |
window = UIWindow(frame: UIScreen.mainScreen().bounds) | |
window!.rootViewController = ViewController() | |
window!.makeKeyAndVisible() | |
return true | |
} | |
} | |
struct Page { | |
var title: String | |
var image: String | |
} | |
let PAGES = [ | |
Page(title: "Explore", image: "https://i.imgur.com/FGknouw.png"), | |
Page(title: "Today Widget", image: "https://i.imgur.com/feuwhEc.png"), | |
] | |
class ViewController: UIViewController { | |
var pageViewController: UIPageViewController! | |
override func viewDidLoad() { | |
super.viewDidLoad() | |
self.view.backgroundColor = UIColor.whiteColor() | |
let pc = UIPageControl.appearance() | |
pc.pageIndicatorTintColor = UIColor.lightGrayColor() | |
pc.currentPageIndicatorTintColor = UIColor.blackColor() | |
pc.backgroundColor = UIColor.whiteColor() | |
let btn = UIButton(type: .System) | |
btn.setTitle("Restart", forState: .Normal) | |
btn.addTarget(self, action: "restartAction:", forControlEvents: .TouchUpInside) | |
self.pageViewController = UIPageViewController(transitionStyle: .Scroll, navigationOrientation: .Horizontal, options: nil) | |
self.pageViewController.dataSource = self | |
self.restartAction(self) | |
self.addChildViewController(self.pageViewController) | |
let views = [ | |
"pg": self.pageViewController.view, | |
"btn": btn, | |
] | |
for (_, v) in views { | |
v.translatesAutoresizingMaskIntoConstraints = false | |
self.view.addSubview(v) | |
} | |
NSLayoutConstraint.activateConstraints( | |
[NSLayoutConstraint( | |
item: btn, | |
attribute: .CenterX, | |
relatedBy: .Equal, | |
toItem: self.view, | |
attribute: .CenterX, | |
multiplier: 1, | |
constant: 0), | |
] + | |
NSLayoutConstraint.constraintsWithVisualFormat("H:|[pg]|", options: .AlignAllCenterX, metrics: [:], views: views) + | |
NSLayoutConstraint.constraintsWithVisualFormat("V:|-30-[pg]-[btn]-15-|", options: .AlignAllCenterX, metrics: [:], views: views) | |
) | |
self.pageViewController.didMoveToParentViewController(self) | |
} | |
func restartAction(sender: AnyObject) { | |
self.pageViewController.setViewControllers([self.viewControllerAtIndex(0)], direction: .Forward, animated: true, completion: nil) | |
} | |
func viewControllerAtIndex(index: Int) -> ContentViewController { | |
if (PAGES.count == 0) || (index >= PAGES.count) { | |
return ContentViewController() | |
} | |
let vc = ContentViewController() | |
vc.pageIndex = index | |
return vc | |
} | |
} | |
// MARK: - Page View Controller Data Source | |
extension ViewController: UIPageViewControllerDataSource { | |
func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? { | |
let vc = viewController as! ContentViewController | |
var index = vc.pageIndex as Int | |
if (index == 0 || index == NSNotFound) { | |
return nil | |
} | |
index-- | |
return self.viewControllerAtIndex(index) | |
} | |
func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? { | |
let vc = viewController as! ContentViewController | |
var index = vc.pageIndex as Int | |
if (index == NSNotFound) { | |
return nil | |
} | |
index++ | |
if (index == PAGES.count) { | |
return nil | |
} | |
return self.viewControllerAtIndex(index) | |
} | |
func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int { | |
return PAGES.count | |
} | |
func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int { | |
return 0 | |
} | |
} | |
class ContentViewController: UIViewController { | |
var pageIndex: Int! | |
override func viewDidLoad() { | |
super.viewDidLoad() | |
let lb = UILabel() | |
lb.textAlignment = .Center | |
lb.text = PAGES[self.pageIndex].title | |
let iv = UIImageView() | |
iv.contentMode = .ScaleAspectFit | |
ImageLoader.sharedLoader.imageForUrl(PAGES[self.pageIndex].image) { (image, url) -> () in | |
iv.image = image | |
} | |
let views = [ | |
"iv": iv, | |
"lb": lb, | |
] | |
for (_, v) in views { | |
v.translatesAutoresizingMaskIntoConstraints = false | |
self.view.addSubview(v) | |
} | |
NSLayoutConstraint.activateConstraints( | |
NSLayoutConstraint.constraintsWithVisualFormat("H:|-[lb]-|", options: .AlignAllCenterX, metrics: [:], views: views) + | |
NSLayoutConstraint.constraintsWithVisualFormat("H:|-[iv]-|", options: .AlignAllCenterX, metrics: [:], views: views) + | |
NSLayoutConstraint.constraintsWithVisualFormat("V:|-[lb]-[iv]-|", options: .AlignAllCenterX, metrics: [:], views: views) | |
) | |
} | |
} | |
class ImageLoader { | |
// source and license: https://github.com/natelyman/SwiftImageLoader | |
let cache = NSCache() | |
class var sharedLoader : ImageLoader { | |
struct Static { | |
static let instance : ImageLoader = ImageLoader() | |
} | |
return Static.instance | |
} | |
func imageForUrl(urlString: String, completionHandler: (image: UIImage?, url: String) -> ()) { | |
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), {()in | |
let data = self.cache.objectForKey(urlString) as? NSData | |
if let goodData = data { | |
let image = UIImage(data: goodData) | |
dispatch_async(dispatch_get_main_queue(), {() in | |
completionHandler(image: image, url: urlString) | |
}) | |
return | |
} | |
let downloadTask: NSURLSessionDataTask = NSURLSession.sharedSession().dataTaskWithURL(NSURL(string: urlString)!, completionHandler: {(data: NSData?, response: NSURLResponse?, error: NSError?) -> Void in | |
if (error != nil) { | |
completionHandler(image: nil, url: urlString) | |
return | |
} | |
if let data = data { | |
let image = UIImage(data: data) | |
self.cache.setObject(data, forKey: urlString) | |
dispatch_async(dispatch_get_main_queue(), {() in | |
completionHandler(image: image, url: urlString) | |
}) | |
return | |
} | |
}) | |
downloadTask.resume() | |
}) | |
} | |
} |
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