Open link to Facebook page from iOS app

Question

I want to redirect user to my App\'s Facebook page, so I have the following code:

[[UIApplication sharedApplication] openURL:
    [NSURL URLWithString: @\"ht         


        

Answer 1

For iOS 9, You must whitelist the url's that your app will call out to using the LSApplicationQueriesSchemes key in your Info.plist.

Check here.

<key>LSApplicationQueriesSchemes</key>
    <array>
     <string>fb</string>
     <string>fbapi</string>
     <string>fbauth2</string>
     <string>fbshareextension</string>
     <string>fb-messenger-api</string>
     <string>twitter</string>
     <string>whatsapp</string>
     <string>wechat</string>
     <string>line</string>
     <string>instagram</string>
     <string>kakaotalk</string>
     <string>mqq</string>
     <string>vk</string>
     <string>comgooglemaps</string>
    </array>

Answer 2

// Swift 5, you can use this function to open fb page/profile

       func openFacebookPage() {
            let facebookURL = NSURL(string: "fb://profile/PageId")!
            if UIApplication.shared.canOpenURL(facebookURL as URL) {
            UIApplication.shared.open(facebookURL as URL)
        } else {
            UIApplication.shared.open(NSURL(string: 
             "https://www.facebook.com/PageName")! as URL)
           }
      }
//By Using PageId or name only
      func openFacebookPage(pageID:String) {
            let facebookURL = NSURL(string: "fb://profile/\(pageID)")!
            if UIApplication.shared.canOpenURL(facebookURL as URL) {
            UIApplication.shared.open(facebookURL as URL)
         } else {
             UIApplication.shared.open(NSURL(string: "https://www.facebook.com/\ 
           (pageID)")! as URL)
         }
     }
//By Using Url only
     func openFacebookPageURL(url:String) {
               let facebookURL = NSURL(string: url)!
               if UIApplication.shared.canOpenURL(facebookURL as URL) {
               UIApplication.shared.open(facebookURL as URL)
            } else {
               UIApplication.shared.open(NSURL(string: url)! as URL)
            }
        }