I think I found the answer:
func isUpdateAvailable(completion: @escaping (Bool?, Error?) -> Void) throws -> URLSessionDataTask {
guard let info = Bundle.main.infoDictionary,
let currentVersion = info["CFBundleShortVersionString"] as? String,
let identifier = info["CFBundleIdentifier"] as? String,
let url = URL(string: "http://itunes.apple.com/lookup?bundleId=\(identifier)") else {
throw VersionError.invalidBundleInfo
}
Log.debug(currentVersion)
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
do {
if let error = error { throw error }
guard let data = data else { throw VersionError.invalidResponse }
let json = try JSONSerialization.jsonObject(with: data, options: [.allowFragments]) as? [String: Any]
guard let result = (json?["results"] as? [Any])?.first as? [String: Any], let version = result["version"] as? String else {
throw VersionError.invalidResponse
}
completion(version != currentVersion, nil)
} catch {
completion(nil, error)
}
}
task.resume()
return task
}
- **Usage:**
_ = try? isUpdateAvailable { (update, error) in
if let error = error {
print(error)
} else if let update = update {
print(update)
}
}
[juanjo's answer][1]
[1]: https://stackoverflow.com/a/40939740/7512091
Swift 3 version:
func isUpdateAvailable() throws -> Bool {
guard let info = Bundle.main.infoDictionary,
let currentVersion = info["CFBundleShortVersionString"] as? String,
let identifier = info["CFBundleIdentifier"] as? String,
let url = URL(string: "http://itunes.apple.com/lookup?bundleId=\(identifier)") else {
throw VersionError.invalidBundleInfo
}
let data = try Data(contentsOf: url)
guard let json = try JSONSerialization.jsonObject(with: data, options: [.allowFragments]) as? [String: Any] else {
throw VersionError.invalidResponse
}
if let result = (json["results"] as? [Any])?.first as? [String: Any], let version = result["version"] as? String {
return version != currentVersion
}
throw VersionError.invalidResponse
}
I think is better to throw an error instead of returning false, in this case I created a VersionError but it can be some other you define or NSError
enum VersionError: Error {
case invalidResponse, invalidBundleInfo
}
Also consider to call this function from another thread, if the connection is slow it can block the current thread.
DispatchQueue.global().async {
do {
let update = try self.isUpdateAvailable()
DispatchQueue.main.async {
// show alert
}
} catch {
print(error)
}
}
**Update**
Using URLSession:
Instead of using `Data(contentsOf: url)` and block a thread, we can use `URLSession`:
func isUpdateAvailable(completion: @escaping (Bool?, Error?) -> Void) throws -> URLSessionDataTask {
guard let info = Bundle.main.infoDictionary,
let currentVersion = info["CFBundleShortVersionString"] as? String,
let identifier = info["CFBundleIdentifier"] as? String,
let url = URL(string: "http://itunes.apple.com/lookup?bundleId=\(identifier)") else {
throw VersionError.invalidBundleInfo
}
Log.debug(currentVersion)
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
do {
if let error = error { throw error }
guard let data = data else { throw VersionError.invalidResponse }
let json = try JSONSerialization.jsonObject(with: data, options: [.allowFragments]) as? [String: Any]
guard let result = (json?["results"] as? [Any])?.first as? [String: Any], let version = result["version"] as? String else {
throw VersionError.invalidResponse
}
completion(version != currentVersion, nil)
} catch {
completion(nil, error)
}
}
task.resume()
return task
}
example:
_ = try? isUpdateAvailable { (update, error) in
if let error = error {
print(error)
} else if let update = update {
print(update)
}
}
