how to make save button to swift 5? - ios

Question

I'm creating a wallpaper app for iOS. I've created a UIImageView, but am stuck on saving the image. I have solved the permissions but am unable to have the user save the image. I created the save button itself, but I don't know to make save any image from the image array in the user's image gallery.
Here is my code so far:
class ViewController: UIViewController {
#IBOutlet var imageview: [UIScrollView]!
#IBOutlet weak var saveButton: UIButton!
#IBAction func saveButtonPressed(_ sender: UIButton) {
// TODO: - How to save the image here
}
let scrollView: UIScrollView = {
let scroll = UIScrollView()
scroll.isPagingEnabled = true
scroll.showsVerticalScrollIndicator = false
scroll.showsHorizontalScrollIndicator = false
scroll.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height)
return scroll
}()
var imageArray = [UIImage]()
func setupImages(_ images: [UIImage]){
for i in 0..<images.count {
let imageView = UIImageView()
imageView.image = images[i]
let xPosition = UIScreen.main.bounds.width * CGFloat(i)
imageView.frame = CGRect(x: xPosition, y: 0, width: scrollView.frame.width, height: scrollView.frame.height)
imageView.contentMode = .scaleAspectFit
scrollView.contentSize.width = scrollView.frame.width * CGFloat(i + 1)
scrollView.addSubview(imageView)
//scrollView.delegate = (self as! UIScrollViewDelegate)
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
view.addSubview(scrollView)
imageArray = [#imageLiteral(resourceName: "1"),#imageLiteral(resourceName: "10"),#imageLiteral(resourceName: "9"),#imageLiteral(resourceName: "8"),#imageLiteral(resourceName: "3")]
setupImages(imageArray)
}
}

Answer 1

You will need to add a saveImage function:
func saveImage(image: UIImage) -> Bool {
guard let data = UIImageJPEGRepresentation(image, 1) ?? UIImagePNGRepresentation(image) else {
return false
}
guard let directory = try? FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false) as NSURL else {
return false
}
do {
try data.write(to: directory.appendingPathComponent("fileName.png")!)
return true
} catch {
print(error.localizedDescription)
return false
}
}
And then in saveButtonPressed:
let success = saveImage(image: imageArray[0])
print("Did \(success ? "" : "not ")store image successfully")
You'll need to add some logic to actually select the image.