CODEWITHSUNDEEP
swiftnsfilemanager
Abhishek Kumar
Abhishek Kumar

Reputation: 79

How to save images in ascending order in swift?

I am building an application in which i am using FileManager to save some images using device camera. So for Now I am saving file name as Doc-Time. I am using below code,

func saveImageToDocumentDirectory(image: UIImage ) {
    let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "hh:mm:ss"
    
    let fileName = "Doc-" + dateFormatter.string(from: Date())
    let fileURL = documentsDirectory.appendingPathComponent(fileName
    )
    if let data = image.jpegData(compressionQuality: 1.0),!FileManager.default.fileExists(atPath: fileURL.path){
        do {
            try data.write(to: fileURL)
            print("file saved")
        } catch {
            print("error saving file:", error)
        }
    }
}

But Here i want to as, Doc-1,Doc-2, Doc-3.... How can i do that?

Upvotes: 1

Views: 153

Answers (2)

Najeeb ur Rehman
Najeeb ur Rehman

Reputation: 413

You can achieve this by simply storing the next index of the image. Like first the index should be 1 when you used named the image as Doc-1 then the index has 2 in it and so on....

One way to store this index in UserDefaults like:

var nextImageIndex: Int {
    UserDefaults.standard.integer(forKey: "NextImageIndex") + 1  //+1 if you want to start with 1
}
    
func incrementImageIndex() {
    UserDefaults.standard.setValue(nextImageIndex, forKey: "NextImageIndex")
}

Put the above code somewhere in UIViewController to see it works.

Here is your updated method...

func saveImageToDocumentDirectory(image: UIImage ) {
    guard let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else {
        return
    }
    
    let fileName = "Doc-\(nextImageIndex)"
    let fileURL = documentsDirectory.appendingPathComponent(fileName)
    let fileAlreadyExists = FileManager.default.fileExists(atPath: fileURL.path)
    if let data = image.jpegData(compressionQuality: 1.0), !fileAlreadyExists {
        do {
            try data.write(to: fileURL)
            incrementImageIndex()
            print("file saved")
        } catch {
            print("error saving file:", error)
        }
    }
}

Upvotes: 1

clawesome
clawesome

Reputation: 1319

Create a variable to store the document count and increment it every time your save to the document directory, then use that value in the string.

let documentKey = "documentIndex" 

@objc var documentIndex: Int {
    get { UserDefaults.value(forKey: documentKey) as? Int ?? 0 }
    set { UserDefaults.setValue(newValue, forKey: documentKey) }
}

func saveImageToDocumentDirectory(image: UIImage ) {
    let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
    
    documentIndex += 1
    
    let fileName = "Doc-\(documentIndex)"
    let fileURL = documentsDirectory.appendingPathComponent(fileName
    )
    if let data = image.jpegData(compressionQuality: 1.0),!FileManager.default.fileExists(atPath: fileURL.path){
        do {
            try data.write(to: fileURL)
            print("file saved")
        } catch {
            print("error saving file:", error)
        }
    }
}

Upvotes: 0

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