Post UIImage to Instagram using Swift similar to SLComposeViewController

Question

I have an iOS Xcode 7 Swift 2 project I\'m working on. The app posts photos to Facebook and Twitter using:

var shareToFacebook: SL         


        

Answer 1

Here is a reusable class with swift 4+. Working in Xcode 10.1.

1. Make swift empty file.

2. copy and paste the below code into the file.

   import UIKit
   import Foundation
   
   class InstagramHelper: NSObject, UIDocumentInteractionControllerDelegate {
   
       private let kInstagramURL = "instagram://den3079"
       private let kUTI = "com.instagram.exclusivegram"
       private let kfileNameExtension = "instagram.igo"
       private let kAlertViewTitle = "Error"
       private let kAlertViewMessage = "Please install the Instagram application"
   
       var documentInteractionController = UIDocumentInteractionController()
   
       // singleton manager
       class var sharedManager: InstagramHelper {
           struct Singleton {
               static let instance = InstagramHelper()
           }
           return Singleton.instance
       }
   
   
       func postImageToInstagramWithCaption(imageInstagram: UIImage, instagramCaption: String, controller: UIViewController) {
           // called to post image with caption to the instagram application
   
           let instagramURL = URL(string: kInstagramURL)
   
           DispatchQueue.main.async {
   
               if UIApplication.shared.canOpenURL(instagramURL!) {
   
                   let jpgPath = (NSTemporaryDirectory() as NSString).appendingPathComponent(self.kfileNameExtension)
                   if let jpegData = UIImageJPEGRepresentation(imageInstagram, 1.0) {
                       do {
                           try jpegData.write(to: URL(fileURLWithPath: jpgPath), options: .atomicWrite)
   
                       } catch {
                           print("write image failed")
                       }
                   }else {
                       let jpegData = UIImagePNGRepresentation(imageInstagram)
                       do {
                           try jpegData?.write(to: URL(fileURLWithPath: jpgPath), options: .atomicWrite)
   
                       } catch {
                           print("write image failed")
                       }
                   }
                   let fileURL = NSURL.fileURL(withPath: jpgPath)
                   self.documentInteractionController.url = fileURL
                   self.documentInteractionController.delegate = self
                   self.documentInteractionController.uti = self.kUTI
   
                   // adding caption for the image
                   self.documentInteractionController.annotation = ["InstagramCaption": instagramCaption]
                   self.documentInteractionController.presentOpenInMenu(from: controller.view.frame, in: controller.view, animated: true)
   
               } else {
   
                   // alert displayed when the instagram application is not available in the device
                   self.showAlert("", message: self.kAlertViewMessage, controller: controller)
               }
           }
       }
    func showAlert(_ title: String, message: String, controller : UIViewController){
   
       let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.alert)
       let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: { action -> Void in
           //Just dismiss the action sheet
           let selector: Selector = NSSelectorFromString("alertOkButtonHandler")
           if controller.responds(to: selector){
               _ = controller.perform(selector)
           }
       })
       alert.addAction(okAction)
       controller.present(alert, animated: true, completion: nil)
   }}
   

And use of this function in ViewController class.

InstagramHelper.sharedManager.postImageToInstagramWithCaption(imageInstagram: img!, instagramCaption: "www.google.com", controller: self)