ShareActionController.swift

ShareActionController.swift

//
//  ShareActionController.swift
//  Musubi
//
//  Created by はるふ on 2017/07/04.
//  Copyright © 2017年 はるふ. All rights reserved.
//

import UIKit
import SafariServices

class ShareActionController: UIAlertController {
    
    enum ShareType: String {
        case twitter = "Twitter"
        case line = "LINE"
        case facebook = "Facebook"
        case other = "その他"
        
        func shareUrl(text: String) -> URL? {
            guard let encoded = text.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) else {
                return nil
            }
            switch self {
            case .twitter:
                return URL(string: "https://twitter.com/intent/tweet?text=\(encoded)")
            case .facebook:
                // url only
                guard ShareActionController.isUrl(text: text) else {
                    return nil
                }
                return URL(string: "https://www.facebook.com/sharer/sharer.php?u=\(encoded)")
            case .line:
                return URL(string: "http://line.me/R/msg/text/?\(encoded)")
            default:
                return nil
            }
        }
    }
    
    private static func isUrl(text: String) -> Bool {
        guard let detector = try? NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue) else {
            return false
        }
        let matches = detector.matches(in: text, options: .reportCompletion, range: NSRangeFromString(text))
        for match in matches {
            if match.url != nil {
                return true
            }
        }
        return false
    }
    
    static func instanciate(text: String, types: [ShareType]) -> ShareActionController {
        let controller = ShareActionController()
        
        types.forEach { type in
            switch type {
            case .twitter, .line, .facebook:
                guard let url = type.shareUrl(text: text) else {
                    print("invalid url for \(type.rawValue)")
                    return
                }
                let action = UIAlertAction(title: type.rawValue, style: .default) { _ in
                    let safari = SFSafariViewController(url: url)
                    // hieralchyがないのでpresentできない
                    controller.present(safari, animated: true, completion: nil)
                }
                controller.addAction(action)
            case .other:
                let action = UIAlertAction(title: type.rawValue, style: .default) { _ in
                    let vc = UIActivityViewController(activityItems: [text], applicationActivities: nil)
                    // hieralchyがないのでpresentできない
                    controller.present(vc, animated: true, completion: nil)
                }
                controller.addAction(action)
            }
        }
        let cancelAction = UIAlertAction(title: "キャンセル", style: .cancel) { _ in
            print("cancel")
        }
        controller.addAction(cancelAction)
        return controller
    }
}