IOS Save image with name - ios

Question

i have an app that takes a picture and merges it with another image. I want to be able to display al the images taken in the app (and only my app) and display them in a gallery view. the problem I am having is in assigning the image a name.
I have tried a number of different ways
First Attempt
UIImageWriteToSavedPhotosAlbum(newImage, nil, nil, nil)
this saved the image but i do not know how i can retrieve it
Second Attempt
PHPhotoLibrary.sharedPhotoLibrary().performChanges({
let assetRequest = PHAssetChangeRequest.creationRequestForAssetFromImage(newImage)
}, completionHandler: { (success, error) -> Void in
if success {
//image saved to photos library.
print("image saved")
}
});
Same Problem as first attempt
Third Attempt
let date :NSDate = NSDate()
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd'_'HH:mm:ss"
dateFormatter.timeZone = NSTimeZone(name: "GMT")
let imageName = "\(dateFormatter.stringFromDate(date)).jpg"
//var paths: [AnyObject] = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, true)
var documentsDirectoryPath = getDocumentsURL().relativePath
documentsDirectoryPath! += imageName
let settingsData: NSData = UIImageJPEGRepresentation(newImage, 1.0)!
settingsData.writeToFile(documentsDirectoryPath!, atomically: true)
This seems to have the most promise but the file does bot save
I have looked at various answers on here but I still cant identify a solution

Answer 1

Add a slash as first character of the imageName string like this:
let imageName = "/\(dateFormatter.stringFromDate(date)).jpg"
otherwise the path would be "..../Documentsmyimagename" but it should be "..../Documents/myimagename"
i.e. without the additional slash the image is saved to the folder above "Documents"
I also recomend not to use the colon character in filenames, on a mac the colon is not allowed and is replaced automatically.
This is the code I tested in a new XCode project and that worked for me (I put a file "myimage.png" in the root folder of the project):
let newImage = UIImage.init(named: "myimage")
let date :NSDate = NSDate()
let dateFormatter = NSDateFormatter()
//dateFormatter.dateFormat = "yyyy-MM-dd'_'HH:mm:ss"
dateFormatter.dateFormat = "yyyy-MM-dd'_'HH_mm_ss"
dateFormatter.timeZone = NSTimeZone(name: "GMT")
let imageName = "/\(dateFormatter.stringFromDate(date)).jpg"
print(imageName)
//var paths: [AnyObject] = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, true)
//var documentsDirectoryPath = getDocumentsURL().relativePath
var documentsDirectoryPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
documentsDirectoryPath += imageName
print(documentsDirectoryPath)
let settingsData: NSData = UIImageJPEGRepresentation(newImage!, 1.0)!
settingsData.writeToFile(documentsDirectoryPath, atomically: true)

Answer 2

SWIFT 3 :)
import UIKit
class ShowImageViewController: UIViewController {
#IBOutlet weak var mainImageView: UIImageView!
#IBOutlet weak var tempImageView: UIImageView!
private var lastPoint = CGPoint.zero
private var red: CGFloat = 0.0
private var green: CGFloat = 0.0
private var blue: CGFloat = 0.0
private var brushWidth: CGFloat = 10.0
private var opacity: CGFloat = 1.0
private var swiped = false
override func viewDidLoad() {
super.viewDidLoad()
mainImageView.image = captureImages[selectedImageindex]
tempImageView.frame = getImageRect(for: mainImageView)
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
swiped = false
if let touch = touches.first {
lastPoint = touch.location(in: tempImageView)
}
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
swiped = true
if let touch = touches.first {
let currentPoint = touch.location(in: tempImageView)
drawLineFrom(fromPoint: lastPoint, toPoint: currentPoint)
lastPoint = currentPoint
}
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
if !swiped {
drawLineFrom(fromPoint: lastPoint, toPoint: lastPoint)
}
// Merge tempImageView into mainImageView
UIGraphicsBeginImageContext(mainImageView.frame.size)
mainImageView.image?.draw(in: CGRect(x: 0, y: 0, width: mainImageView.frame.size.width, height: mainImageView.frame.size.height), blendMode: .normal, alpha: 1.0)
tempImageView.image?.draw(in: CGRect(x: 0, y: 0, width: mainImageView.frame.size.width, height: mainImageView.frame.size.height), blendMode: .normal, alpha: opacity)
mainImageView.image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
tempImageView.image = nil
}
func drawLineFrom(fromPoint: CGPoint, toPoint: CGPoint) {
UIGraphicsBeginImageContext(mainImageView.frame.size)
let context = UIGraphicsGetCurrentContext()
tempImageView.image?.draw(in: CGRect(x: 0, y: 0, width: mainImageView.frame.size.width, height: mainImageView.frame.size.height))
context!.move(to: CGPoint(x: fromPoint.x, y: fromPoint.y))
context!.addLine(to: CGPoint(x: toPoint.x, y: toPoint.y))
context!.setLineCap(.round)
context!.setLineWidth(brushWidth)
context!.setStrokeColor(red: red, green: green, blue: blue, alpha: 1.0)
context!.setBlendMode(.normal)
context!.strokePath()
tempImageView.image = UIGraphicsGetImageFromCurrentImageContext()
tempImageView.alpha = opacity
UIGraphicsEndImageContext()
}
func getImageRect(for imageView: UIImageView) -> CGRect {
let resVi = (imageView.image?.size.width)! / (imageView.image?.size.height)!
let resPl = imageView.frame.size.width / imageView.frame.size.height
if resPl > resVi {
let imageSize = CGSize(width: CGFloat((imageView.image?.size.width)! * imageView.frame.size.height / (imageView.image?.size.height)!), height: CGFloat(imageView.frame.size.height))
return CGRect(x: CGFloat((imageView.frame.size.width - imageSize.width) / 2), y: CGFloat((imageView.frame.size.height - imageSize.height) / 2), width: CGFloat(imageSize.width), height: CGFloat(imageSize.height))
}
else {
let imageSize = CGSize(width: CGFloat(imageView.frame.size.width), height: CGFloat((imageView.image?.size.height)! * imageView.frame.size.width / (imageView.image?.size.width)!))
return CGRect(x: CGFloat((imageView.frame.size.width - imageSize.width) / 2), y: CGFloat((imageView.frame.size.height - imageSize.height) / 2), width: CGFloat(imageSize.width), height: CGFloat(imageSize.height))
}
}
}