Difference between revisions of "Swift code snippets"

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==[[Swift:UIGraphics Scale Down CGImage]]==
 
==[[Swift:UIGraphics Scale Down CGImage]]==
  
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==Swift: Convert between CGImage, CIImage and UIImage==
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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==
 
==Swift Detect Volumn Button Press==

Revision as of 04:15, 23 March 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: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

Credit to http://stackoverflow.com/questions/28471481/swift-detect-volume-button-press

Detect volume button press, also hide volume HUD 

import MediaPlayer //Only for hidding  Volume view
func listenVolumeButton(){

    let audioSession = AVAudioSession.sharedInstance()
    audioSession.setActive(true, error: nil)
    audioSession.addObserver(self, forKeyPath: "outputVolume", options: NSKeyValueObservingOptions.New, context: nil)
    //If you want to hide Volume HUD view
    var volumeView: MPVolumeView = MPVolumeView(frame: CGRectZero)
    view.addSubview(volumeView)
}

override func observeValueForKeyPath(keyPath: String, ofObject object: AnyObject,
    change: [NSObject : AnyObject], context: UnsafeMutablePointer<Void>) {
    if keyPath == "outputVolume"{
        print("got in here")
    }
}
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