ソフトウェアエンジニアの技術ブログ：Software engineer tech blog

_Nullable -can have a nil value
-Nonnull -not expected to be nil

@interface Book : NSObject

@property (nonatomic, copy) NSString *title;
@property (nonatomic) Person *author;
@property (nonatomic) Person *editor;
@property (nonatomic) int yearOfPublication;

-(instancetype)initWithTitle:(NSString*)title
	author:(Person*)author
	year:(int)year;

@end

class Gif: NSObject, NSCoding {
	let url: NSURL
	let videoURL: NSURL
	let caption: String?
	let gitImage: UIImage
	var gifData: NSData?

	init(url: NSURL, videoURL: NSURL, caption: String?){
		self.url = url
		self.videoURL = videoURL
		self.caption = caption
		self.gifImage = UIImage.gifWithURL(url.absoluteString)!
		self.gifData = nil
	}

	required init?(coder decoder: NSCoder){
		self.url = decoder.decodeObjectForKey("url") as! NSURL
		self.videoURL = decoder.decodeObjectForKey("videoURL") as! NSURL
		self.caption = decoder.decodeObjectForKey("caption") as? String
		self.gifImage = decoder.decodeObjectForKey("gifImage") as! UIImage
		self.gifData = decoder.decodeObjectForKey("gifData") as? NSData
	}

	func encodeWithCoder(coder: NSCoder){
		coder.encodeObject(self.url, forKey: "url")
		coder.encodeObject(self.videoURL, forKey: "videoURL")
		coder.encodeObject(self.caption, forKey: "caption")
		coder.encodeObject(self.gifImage, forKey: "gifImage")
		coder.encodeObject(self.gifData, forKey:"gifData")
	}
}

create the file path

var gifsFilePath: String {
	let directories = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
	let documentsPath = directories[0]
	let gifsPath = documentsPath.stringByAppendingString("/savedGifs")
	return gifsPath
}

var gif: Gif?
@IBOutlet weakl var gifImageView: UIImageView!

override func viewDidLoad(){
	super.viewDidLoad()
	gifImageView.image = gif?.gifImage
}

@IBAction func sharedGif(sendr: UIButton){
	var itemsToShare = [NSData]()
	itemsToShare.append((self.gif?gifData)!)

	let activityVC = UIActivityViewController(activityItems: itemsToShare, applicationActivities: nil)
	activityVC.completionWithItemsHandler = {(activity, comleted, items, error) in:
		if (completed){
			self.dismissViewControllerAnimated(true, completion: nil)
		}
	}
	presentViewController(activityVC, animated: true, completion:nil)
}

imagePicker property settings

func imagePicker(source:UIImagePickerControllerSourceType) -> UIImagePickerController {
	let picker = UIImagePickerController()
	picker.sourceType = source;
	picker.mediaTypes = [kUTTypeMovie as String]
	picker.allowsEditing = true;
	picker.delegate = self;

	return picker
}

func imagePicker(source:UIImagePickerControllerSourceType) -> UIImagePickerController {
	let picker = UIImagePickerController()
	picker.sourceType = source;
	picker.mediaTypes = [kUTTypeMovie as String]
	picker.allowsEditing = true;
	picker.delegate = self;

	return picker	
}

func convertVideToGIF(videoURL: NSURL, start: NSNumber?, duration: NSNumber?){
	dispatch_async(dispatch_get_main_queue()){
		self.dismissViewControllerAnimated(true, completion: nil)
	}

	let regift: Regift;

	if let start = start {
		regift = Regift(sourceFileURL: videoURL, destinationFileURL: nil, startTime: start.floatValue, duration: duration!.floatValue, frameRate: frameRate, loopCount: loopCount)
	} else {
		// Untrimmed
		regift = Regift(sourceFileURL: videoURL, destinationFileURL: nil, frameCount: frameCount, delayTime: delayTime, loopCount: loopCount)
	}

	let gifURL = regif.createGif()
	let gif = Gif(url: gifURL!, rawVideoURL: videoURL, caption: nil)
	displayGIF(gif)
}

public func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo
	info: [String : AnyObject]){
	let mediaType = info[UIImagePickerControllerMediaType] as! String

	if mediaType == kUTTypeMovie as String {

		let videoURL = info[UIImagePickerControllerMediaURL] as! NSURL
		let start: NSNumber? = info["_UIImagePickerControllerVideoEditingStart"] as? NSNumber
		let end: NSNumber? = info["_UIImagePickerControllerVideoEditingEnd"] as? NSNumber	
		var duration: NSNumber?
		if let start = start {
			duration = NSNumber(float: (end!.floatValue) - (start.floatValue))
		} else {
			duration = nil
		}
		convertVideoToGIF(videoURL, start: start, duration: duration)
	}	
}

// Methods to adjust the keyboard
extension GiftEditorViewController {
	func subscribeToKeyboardNotifications(){
		NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(GiftEditorViewController.keyboardWillShow(_:)),
			name: UIKeyboardWillShowNotification,
			object: nil)
		NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(GiftEditorViewController.keyboardWillHide(_:)),
			name: UIKeyboardWillHideNotification,
			object: nil)

	}

	func unsubscribeFromKeyboardNotifications(){
		NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
		NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
	}

	func keyboardWillShow(notification: NSNotification){
		if view.frame.origin.y >= 0 {
			view.frame.origin.y -= getKeyboardHeight(notification)
		}
	}

	func getKeyboardHeight(notification: NSNotification) -> CGFloat{
		let userInfo = notification.userInfo
		let keyboardSize = userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue
		return keyboardSize.CGRectValue().height
	}
}

Share the GIF

@IBAction func shareGif(sender: AnyObject){
	let url: NSURL = (self.gif?.url)!
	let animatedGIF = NSData(contentsOfURL: url)!
	let itemsToShare = [animatedGIF]

	let activityVC = UIActivityViewController(activityItems: itemToShare, applicationActivities: nil)

	activityVC.completionWithItemsHandler = {(activity, completed, items, error) in
		if(completed){
			self.navigationController?.popToRootViewControllerAnimated(true)
		}
	}

	navigationController?.presentViewController(activityVC, animated: true, completion: nil)
}

Create an Action Sheet

@IBAction func presentVideoOptions(){
	if !UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera){
		//launchPhotoLibrary()
	} else {

		let newGifActionSheet = UIAlertController(title: "Create new GIF", message: nil, preferredStyle: UIAlertControllerStyle.ActionSheet)

		let recordVideo = UIAlertAction(title: "Record a Video", style: UIAlertActionStyle.Default, handler: {
			(UIAlertAction) in self.launchVideoCamera()
			})
	}
}