CODEWITHSUNDEEP
swiftswift4
Harsh
Harsh

Reputation: 73

Can I return case values of switch statement? Swift 4

Trying to make a swift file with all kinds of permissions for iPhone including

So I tried searching, How to know if user has access to Camera?

and mostly getting functions with Switch statements. What I am looking for is universal functions to call anywhere in project e:g after calling function elsewhere in project I want to able to perform if case .authorised then do code A elseif .denied then do code B else .notDetermined do code C.

func checkPhotoLibraryPermission() {
    let status = PHPhotoLibrary.authorizationStatus()
    switch status {
    case .authorized:
        print("Authorized")
    case .denied, .restricted :
    case .notDetermined:
        PHPhotoLibrary.requestAuthorization() { status in
            switch status {
            case .authorized:
                print("Authorized")
            case .denied, .restricted:
                print("No access")
            case .notDetermined:
                print("Not determined")
            }
        }
    }
}

Upvotes: 4

Views: 7571

Answers (4)

LHIOUI
LHIOUI

Reputation: 3337

You need a callback function as PHPhotoLibrary.requestAuthorization() is an async operation.

func checkPhotoLibraryPermission(callback:(authorized:Bool)->Void) {
    let status = PHPhotoLibrary.authorizationStatus()
    switch status {
    case .authorized:
        callback(true)
    case .denied, .restricted :
         callback(false)
    case .notDetermined:
        PHPhotoLibrary.requestAuthorization() { status in
            switch status {
            case .authorized:
                 callback(true)
            case .denied, .restricted,.notDetermined:
                 callback(false)
           }
        }
    }
}

Upvotes: 2

Jitendra
Jitendra

Reputation: 5081

Yes, you can do this with the help of blocks.

public typealias CompletionHandler = ((Bool)->Void)?

  @objc func yourMethod(completionBlock : CompletionHandler){
    let status = PHPhotoLibrary.authorizationStatus()
    switch status {
    case .authorized:
        completionBlock(true);
    case .denied, .restricted :
         completionBlock(false);
    case .notDetermined:
        PHPhotoLibrary.requestAuthorization() { status in
            switch status {
            case .authorized:
                 completionBlock(true);
            case .denied, .restricted:
                 completionBlock(false);
            case .notDetermined:
                 completionBlock(false);
           }
        }
        }
    }

This is just a sample you can write accordingly.

Upvotes: 2

Mahesh Dangar
Mahesh Dangar

Reputation: 804

func checkPhotoLibraryPermission() -> Bool {
    let status = PHPhotoLibrary.authorizationStatus()
    switch status {
    case .authorized:
        print("Authorized")

        return true
    case .denied:

        return true

    case .restricted :

          return false

    case .notDetermined:

         return false

        }
    }

}

something like this ?? if yes then it's great and if no then let me know what exactly you want so i can try to code switch case as per your requirement :)

Upvotes: 1

Iraniya Naynesh
Iraniya Naynesh

Reputation: 1165

Update your function with return type

func isPhotoLibraryPermission() -> bool {
    let status = PHPhotoLibrary.authorizationStatus()
    switch status {
        case .authorized:
           print("Authorized")
           return true
        case .denied, .restricted :
           return false
        case .notDetermined:
           PHPhotoLibrary.requestAuthorization() { status in
              switch status {
                  case .authorized:
                      print("Authorized")
                      return true
                  case .denied, .restricted:
                      print("No access")
                      return false
                  case .notDetermined:
                      print("Not determined")
                      return false
             }
        }
    }
}

PS: If you need something more generic, create enum with all cases you want to return and then return that :-)

Upvotes: 0

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