Saving and Loading Images, Swift 2.0

Swift 2.0 , Xcode 7.1.1

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Here is the function to save your image first.
We’ll assume you already have an UIImageView, containing an image, named ‘image’ :

func saveImage (image: UIImage, path: String ) -> Bool{
        
        let pngImageData = UIImagePNGRepresentation(image)
        //let jpgImageData = UIImageJPEGRepresentation(image, 1.0)   // if you want to save as JPEG
        let result = pngImageData!.writeToFile(path, atomically: true)
        
        return result
        
    }

func saveImage (image: UIImage, path: String ) -> Bool{

let pngImageData = UIImagePNGRepresentation(image)

//let jpgImageData = UIImageJPEGRepresentation(image, 1.0) // if you want to save as JPEG

let result = pngImageData!.writeToFile(path, atomically: true)

return result

}

Here is how to use the function later in your code:

saveImage(image, path: imagePath)

1	saveImage(image, path: imagePath)

However before you can Save or Load anything you have to know the ‘path’ you are going to use.
We’ll need 3 things:

- - a function to pinpoint the documents directory
  - a function to pinpoint a file in the documents directory
  - a variable to store the location ( path ) of the image we want to save

Here is how we are going to do that:

func getDocumentsURL() -> NSURL {
    let documentsURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]
    return documentsURL
}

func fileInDocumentsDirectory(filename: String) -> String {
    
    let fileURL = getDocumentsURL().URLByAppendingPathComponent(filename)
    return fileURL.path!
    
}
 
// Define the specific path, image name
let imagePath = fileInDocumentsDirectory(myImageName)

func getDocumentsURL() -> NSURL {

let documentsURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]

return documentsURL

}

func fileInDocumentsDirectory(filename: String) -> String {

let fileURL = getDocumentsURL().URLByAppendingPathComponent(filename)

return fileURL.path!

}

// Define the specific path, image name

let imagePath = fileInDocumentsDirectory(myImageName)

Make sure the 2 functions above are placed before the class declaration. For example, before:

class ViewController: UIViewController {

1	class ViewController: UIViewController {

At this point you already have the image saved to the documents folder inside your app folder.
Keep in mind that folder will keep changing when using the IOS Simulator.

Here is how to declare the function for loading an image from a Path:

func loadImageFromPath(path: String) -> UIImage? {
        
        let image = UIImage(contentsOfFile: path)
        
        if image == nil {
            
            print("missing image at: \(path)")
        }
        print("Loading image from path: \(path)") // this is just for you to see the path in case you want to go to the directory, using Finder.
        return image
        
    }

func loadImageFromPath(path: String) -> UIImage? {

let image = UIImage(contentsOfFile: path)

if image == nil {

print("missing image at: \(path)")

}

print("Loading image from path: \(path)") // this is just for you to see the path in case you want to go to the directory, using Finder.

return image

}

Now we can use that function and load our image and
apply it to an imageView you might have for an example:

image = loadImageFromPath(imagePath)
            imageView.image = image

1 2	image = loadImageFromPath(imagePath) imageView.image = image

Here is how the full example should look:

import UIKit

func getDocumentsURL() -> NSURL {
    let documentsURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]
    return documentsURL
}

func fileInDocumentsDirectory(filename: String) -> String {
    
    let fileURL = getDocumentsURL().URLByAppendingPathComponent(filename)
    return fileURL.path!
    
}

class ViewController: UIViewController {

    @IBOutlet var imageView: UIImageView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Define the specific path, image name
        let myImageName = "image.png"
        let imagePath = fileInDocumentsDirectory(myImageName)
        
        if let image = imageView.image {
        saveImage(image, path: imagePath)
        } else { print("some error message") }
        
        if let loadedImage = loadImageFromPath(imagePath) {
            print(" Loaded Image: \(loadedImage)")
        } else { print("some error message 2") }
        
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    func saveImage (image: UIImage, path: String ) -> Bool{
        
        let pngImageData = UIImagePNGRepresentation(image)
        //let jpgImageData = UIImageJPEGRepresentation(image, 1.0)   // if you want to save as JPEG
        let result = pngImageData!.writeToFile(path, atomically: true)
        
        return result
        
    }
    
    func loadImageFromPath(path: String) -> UIImage? {
        
        let image = UIImage(contentsOfFile: path)
        
        if image == nil {
            
            print("missing image at: \(path)")
        }
        print("Loading image from path: \(path)") // this is just for you to see the path in case you want to go to the directory, using Finder.
        return image
        
    }


}

import UIKit

func getDocumentsURL() -> NSURL {

let documentsURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]

return documentsURL

}

func fileInDocumentsDirectory(filename: String) -> String {

let fileURL = getDocumentsURL().URLByAppendingPathComponent(filename)

return fileURL.path!

}

class ViewController: UIViewController {

@IBOutlet var imageView: UIImageView!

override func viewDidLoad() {

super.viewDidLoad()

// Define the specific path, image name

let myImageName = "image.png"

let imagePath = fileInDocumentsDirectory(myImageName)

if let image = imageView.image {

saveImage(image, path: imagePath)

} else { print("some error message") }

if let loadedImage = loadImageFromPath(imagePath) {

print(" Loaded Image: \(loadedImage)")

} else { print("some error message 2") }

}

override func didReceiveMemoryWarning() {

super.didReceiveMemoryWarning()

// Dispose of any resources that can be recreated.

}