Difference between revisions of "Swift code snippets"

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=Swift Code snippts=
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=Swift Code Snippts=
 
Back To [[IOS_Swift]]
 
Back To [[IOS_Swift]]
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==Making Network Request==
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==[[Swift: Use NSUserDefaults to Store Persistence Data]]==
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<pre class="brush:swift">
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var clientId = "Put your client id here"
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var url = NSURL(string: "https://api.instagram.com/v1/media/popular?client_id=\(clientId)")!
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var request = NSURLRequest(URL: url)
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NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) { (response: NSURLResponse!, data: NSData!, error: NSError!) -> Void in
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    var responseDictionary = NSJSONSerialization.JSONObjectWithData(data, options: nil, error: nil) as NSDictionary
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    self.photos = responseDictionary["data"] as NSArray
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    self.tableView.reloadData()
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    println("response: \(self.photos)")
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}
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</pre>
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==Use AFNetworking setImageWithURL==
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==[[Swift: Making Network Request Using NSURLConnection]]==
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Create the bridging file: create a new Objective-C file, name it anything, and when you save it, Xcode will prompt you generate a bridging file. <br>
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In an Objective-C bridging file:
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<pre class="brush:swift">
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#import <AFNetworking/UIImageView+AFNetworking.h>
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</pre>
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In the swift view file, to set a imageView using URL:
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<pre class="brush:swift">
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setImageWithURL(NSURL(string: thumbnailURL))
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</pre>
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==Adding UIRefreshControl==
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==[[Swift:Use AFNetworking setImageWithURL]]==
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<pre class="brush:swift">
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//refreshControl is automatically defined in UITableViewController
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var refreshControl: UIRefreshControl?
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override func viewDidLoad() {
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    super.viewDidLoad()
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    refreshControl = UIRefreshControl()
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    refreshControl?.addTarget(self, action: "fetch", forControlEvents: UIControlEvents.ValueChanged)
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    tableView.insertSubview(refreshControl!, atIndex: 0)
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}
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//to stop refresh, call
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==[[Swift:Using UIRefreshControl]]==
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if let rc = self.refreshControl {
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    self.refreshControl!.endRefreshing()
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}
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</pre>
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==Example of fetching messages from Parse==
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==[[Swift:Using UIGestureRecognizer]]==
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==Swift:Example of fetching messages from Parse==
 
https://gist.github.com/sandofsky/7134b1ff90d235901254
 
https://gist.github.com/sandofsky/7134b1ff90d235901254
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==Auto Table Row Height==
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<pre class="brush:swift">
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==[[Swift:Auto Table Row Height]]==
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//Auto table row height
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tableView.estimatedRowHeight = 92.0
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==[[Swift:Navigation between storyboards]]==
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tableView.rowHeight = UITableViewAutomaticDimension
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</pre>
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==[[Swift:Notification Observer Using NSNotificationCenter]]==
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==Navigation between storyboards==
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===Navigate to Storyboard ID===
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==[[Swift:Get Raw Histogram from CGImage]]==
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<pre class="brush:swift">
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var vc = storyboard.instantiateViewControllerWithIdentifier("loginViewController") as UIViewController
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==[[Swift:UIGraphics Drawing on UIView]]==
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window?.rootViewController = vc
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</pre>
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==[[Swift:UIGraphics Scale Down CGImage]]==
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===Navigate Segue by Identifier===
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First, drag a segue in storyboard and give it an identifier, then in the button action (or any action you like), do:
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==[[Swift: Convert between CGImage, CIImage and UIImage]]==
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<pre class="brush:swift">
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self.performSegueWithIdentifier("loginSegue", sender: self)
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==[[Swift:Detect Volumn Button Press]]==
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</pre>
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===Get UIVewController from Navigation Controller===
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==[[Swift:NSTimer scheduledTimerWithTimeInterval]]==
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Sometimes, you want to access the UIViewController from a navigation controller
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<pre class="brush:swift">
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var vc = storyboard?.instantiateViewControllerWithIdentifier("navigationID") as UINavigationController
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var v = vc.viewControllers[0] as ViewController // [0] represents the first level UIViewController under NavigationController
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</pre>
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==Notification in Swift==
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Listen notification in swift
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<pre class="brush:swift">
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func tweetSent(notification: NSNotification) {
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    let newTweet:Dictionary<String, Tweet> = notification.userInfo as Dictionary<String, Tweet>
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}
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NSNotificationCenter.defaultCenter().addObserver(self, selector: "tweetSent:", name: "newTweetNotification", object: nil)
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</pre>
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Send/Post notification in swift
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<pre class="brush:swift">
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var userInfo: Dictionary<String, Tweet> = ["tweet": newTweet]
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NSNotificationCenter.defaultCenter().postNotificationName("newTweetNotification", object: nil, userInfo: userInfo)
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</pre>
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Remove notification observer
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<pre class="brush:swift">
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deinit {
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    NSNotificationCenter.defaultCenter().removeObserver(self)
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}
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</pre>
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Latest revision as of 03:10, 9 April 2015

Swift Code Snippts

Back To IOS_Swift

Swift: Use NSUserDefaults to Store Persistence Data

Swift: Making Network Request Using NSURLConnection

Swift:Use AFNetworking setImageWithURL

Swift:Using UIRefreshControl

Swift:Using UIGestureRecognizer

Swift:Example of fetching messages from Parse

https://gist.github.com/sandofsky/7134b1ff90d235901254

Swift:Auto Table Row Height

Swift:Navigation between storyboards

Swift:Notification Observer Using NSNotificationCenter

Swift:Get Raw Histogram from CGImage

Swift:UIGraphics Drawing on UIView

Swift:UIGraphics Scale Down CGImage

Swift: Convert between CGImage, CIImage and UIImage

Swift:Detect Volumn Button Press

Swift:NSTimer scheduledTimerWithTimeInterval

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