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]]
 
==[[Swift: Use NSUserDefaults to Store Persistence Data]]==
 
==[[Swift: Use NSUserDefaults to Store Persistence Data]]==
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==[[Swift:Using UIRefreshControl]]==
 
==[[Swift:Using UIRefreshControl]]==
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==[[Swift:Using UIGestureRecognizer]]==
  
 
==Swift:Example of fetching messages from Parse==
 
==Swift:Example of fetching messages from Parse==
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==[[Swift:UIGraphics Drawing on UIView]]==
 
==[[Swift:UIGraphics Drawing on UIView]]==
  
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==Swift: Scale down CGImage==
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==[[Swift:UIGraphics Scale Down CGImage]]==
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<pre class="brush:swift">
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func scaleDownCGImage(image: CGImage, scale: Float) -> CGImage!{
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    var scaleDiv = UInt(1.0 / scale)
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    let width = CGImageGetWidth(image) / scaleDiv
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    let height = CGImageGetHeight(image) / scaleDiv
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    let bitsPerComponent = CGImageGetBitsPerComponent(image)
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    let bytesPerRow = CGImageGetBytesPerRow(image)
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    let colorSpace = CGImageGetColorSpace(image)
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    let bitmapInfo = CGImageGetBitmapInfo(image)
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    let context = CGBitmapContextCreate(nil, width, height, bitsPerComponent, bytesPerRow, colorSpace, bitmapInfo)
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    CGContextSetInterpolationQuality(context, kCGInterpolationMedium)
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    let imgSize = CGSize(width: Int(width), height: Int(height))
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    CGContextDrawImage(context, CGRect(origin: CGPointZero, size: imgSize), image)
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    return CGBitmapContextCreateImage(context)
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}
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</pre>
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==Swift: Convert between CGImage, CIImage and UIImage==
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===Swift: Convert CIImage to CGImage===
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<pre class="brush:swift">
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func convertCIImageToCGImage(inputImage: CIImage) -> CGImage! {
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    let context = CIContext(options: nil)
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    if context != nil {
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        return context.createCGImage(inputImage, fromRect: inputImage.extent())
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    }
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    return nil
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}
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</pre>
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===Swift: Convert CGImage to CIImage===
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<pre class="brush:swift">
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func convertCGImageToCIImage(inputImage: CGImage) -> CIImage! {
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  var ciImage = CIImage(CGImage: inputImage)
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    return ciImage
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}
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</pre>
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===Swift: Convert CGImage or CIImage to UIImage===
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<pre class="brush:swift">
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UIImage(CGImage: cgImage)
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UIImage(CIImage: ciImage)
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</pre>
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===Swift: Convert UIImage to CIImage===
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<pre class="brush:swift">
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//uiImage: UIImage
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//Convert to CIImage
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var ciImage = CIImage(image: uiImage)
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</pre>
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===Swift: Convert UIImage to CGImage===
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To convert to CGImage, it requires 2 steps:
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First convert to CIImage [[#Swift: Convert UIImage to CIImage]].
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Then convert to CGImage [[#Swift:_Convert_CIImage_to_CGImage]]
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==Swift Detect Volumn Button Press==
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Credit to http://stackoverflow.com/questions/28471481/swift-detect-volume-button-press
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Detect volume button press, also hide volume HUD
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<pre class="brush:swift">
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import MediaPlayer //Only for hidding  Volume view
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func listenVolumeButton(){
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    let audioSession = AVAudioSession.sharedInstance()
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==[[Swift: Convert between CGImage, CIImage and UIImage]]==
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    audioSession.setActive(true, error: nil)
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    audioSession.addObserver(self, forKeyPath: "outputVolume", options: NSKeyValueObservingOptions.New, context: nil)
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    //If you want to hide Volume HUD view
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    var volumeView: MPVolumeView = MPVolumeView(frame: CGRectZero)
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    view.addSubview(volumeView)
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}
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override func observeValueForKeyPath(keyPath: String, ofObject object: AnyObject,
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==[[Swift:Detect Volumn Button Press]]==
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    change: [NSObject : AnyObject], context: UnsafeMutablePointer<Void>) {
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    if keyPath == "outputVolume"{
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        print("got in here")
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    }
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}
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</pre>
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==[[Swift:NSTimer scheduledTimerWithTimeInterval]]==

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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