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Check and Deep link into supported mail apps on iOS
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| enum MailClient: CaseIterable { | |
| case gmail | |
| case outlook | |
| case yahoo | |
| case spark | |
| case apple | |
| } |
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| import UIKit | |
| protocol URLHandlerProtocol { | |
| func canOpenURL(_ url: URL) -> Bool | |
| func open(_ url: URL, options: [UIApplication.OpenExternalURLOptionsKey : Any], completionHandler completion: ((Bool) -> Void)?) | |
| } | |
| extension UIApplication: URLHandlerProtocol {} | |
| // GIST is sponsored by the following StackOverflow answer: | |
| // https://stackoverflow.com/a/55765362 | |
| struct MailClientProvider { | |
| let content: MailContent | |
| let urlHandler: URLHandlerProtocol | |
| func getFirstSupportedMailClientURL() -> URL? { | |
| getAllSupportedMailClients() | |
| .first | |
| .flatMap(getURL(for:)) | |
| } | |
| func openFirstSupportedMailClient(completion: ((Bool) -> Void)?) { | |
| guard let firstSupportedMailClientURL = getFirstSupportedMailClientURL() else { | |
| print("Failed to open any mail client, none of them are supported") | |
| completion?(false) | |
| return | |
| } | |
| urlHandler.open(firstSupportedMailClientURL, options: [:], completionHandler: completion) | |
| } | |
| func getAllSupportedMailClients() -> [MailClient] { | |
| return MailClient.allCases.filter(canOpenMailClient(_:)) | |
| } | |
| func canOpenMailClient(_ client: MailClient) -> Bool { | |
| guard let url = getURL(for: client) else { | |
| print("Mail Client URL corrupted \(client)") | |
| return false | |
| } | |
| return urlHandler.canOpenURL(url) | |
| } | |
| func getURL(for client: MailClient) -> URL? { | |
| let toURLPart = "to=\(content.recipientEmail)" | |
| let subjectURLPart = "subject=\(content.subject)" | |
| let bodyURLPart = "body=\(content.body)" | |
| let subjectAndBodyPart = [subjectURLPart, bodyURLPart].joined(separator: "&") | |
| let fullURLPart = [toURLPart, subjectURLPart, bodyURLPart].joined(separator: "&") | |
| switch client { | |
| case .gmail: | |
| return URL(string: "googlegmail://co?\(fullURLPart)") | |
| case .outlook: | |
| return URL(string: "ms-outlook://compose?\(fullURLPart)") | |
| case .yahoo: | |
| return URL(string: "ymail://mail/compose?\(fullURLPart)") | |
| case .spark: | |
| return URL(string: "readdle-spark://compose?recipient=\(content.recipientEmail)&\(subjectAndBodyPart)") | |
| case .apple: | |
| return URL(string: "mailto:\(content.recipientEmail)?\(subjectAndBodyPart)") | |
| } | |
| } | |
| } |
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| struct MailContent { | |
| let recipientEmail: String | |
| @URLPercentEncoded var body: String | |
| @URLPercentEncoded var subject: String | |
| } |
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| // MARK: - Extension | |
| extension String { | |
| var urlPercentEncoded: String { | |
| addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) ?? self | |
| } | |
| } | |
| // MARK: - Property Wrapper | |
| @propertyWrapper | |
| struct URLPercentEncoded { | |
| var wrappedValue: String { | |
| didSet { | |
| wrappedValue = wrappedValue.urlPercentEncoded | |
| } | |
| } | |
| init(wrappedValue: String) { | |
| self.wrappedValue = wrappedValue.urlPercentEncoded | |
| } | |
| } |
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