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

I was happy to find skladek's answer, so here's my contribution: Swift + other social networks.

I found that I needed 3 forward slashes for twitter, and only 2 for Facebook and Google+, I didn't investigate more than that…

// Go to https://graph.facebook.com/PageName to get your page id
func openFacebookPage() {
    let facebookURL = NSURL(string: "fb://profile?id=PageName")!
    if UIApplication.sharedApplication().canOpenURL(facebookURL) {
        UIApplication.sharedApplication().openURL(facebookURL)
    } else {
        UIApplication.sharedApplication().openURL(NSURL(string: "https://www.facebook.com/PageName")!)
    }
}

func openTwitterProfile() {
    let twitterURL = NSURL(string: "twitter:///user?screen_name=USERNAME")!
    if UIApplication.sharedApplication().canOpenURL(twitterURL) {
        UIApplication.sharedApplication().openURL(twitterURL)
    } else {
        UIApplication.sharedApplication().openURL(NSURL(string: "https://twitter.com/USERNAME")!)
    }
}

func openGooglePlusPage() {
    let googlePlusURL = NSURL(string: "gplus://plus.google.com/u/0/PageId")!
    if UIApplication.sharedApplication().canOpenURL(googlePlusURL) {
        UIApplication.sharedApplication().openURL(googlePlusURL)
    } else {
        UIApplication.sharedApplication().openURL(NSURL(string: "https://plus.google.com/PageId")!)
    }
}

An attempt at refactoring:

struct SocialNetworkUrl {
    let scheme: String
    let page: String

    func openPage() {
        let schemeUrl = NSURL(string: scheme)!
        if UIApplication.sharedApplication().canOpenURL(schemeUrl) {
            UIApplication.sharedApplication().openURL(schemeUrl)
        } else {
            UIApplication.sharedApplication().openURL(NSURL(string: page)!)
        } 
    }
}

enum SocialNetwork {
    case Facebook, GooglePlus, Twitter, Instagram
    func url() -> SocialNetworkUrl {
        switch self {
        case .Facebook: return SocialNetworkUrl(scheme: "fb://profile/PageId", page: "https://www.facebook.com/PageName")
        case .Twitter: return SocialNetworkUrl(scheme: "twitter:///user?screen_name=USERNAME", page: "https://twitter.com/USERNAME")
        case .GooglePlus: return SocialNetworkUrl(scheme: "gplus://plus.google.com/u/0/PageId", page: "https://plus.google.com/PageId")
        case .Instagram: return SocialNetworkUrl(scheme: "instagram://user?username=USERNAME", page:"https://www.instagram.com/USERNAME")
        }
    }
    func openPage() {
        self.url().openPage()
    }
}

Now you can call:

SocialNetwork.Twitter.openPage()