You can use this NSURLSession extension to add a synchronous method:
extension NSURLSession {
func synchronousDataTaskWithURL(url: NSURL) -> (NSData?, NSURLResponse?, NSError?) {
var data: NSData?, response: NSURLResponse?, error: NSError?
let semaphore = dispatch_semaphore_create(0)
dataTaskWithURL(url) {
data = $0; response = $1; error = $2
dispatch_semaphore_signal(semaphore)
}.resume()
dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER)
return (data, response, error)
}
}
Update for Swift 3:
extension URLSession {
func synchronousDataTask(with url: URL) -> (Data?, URLResponse?, Error?) {
var data: Data?
var response: URLResponse?
var error: Error?
let semaphore = DispatchSemaphore(value: 0)
let dataTask = self.dataTask(with: url) {
data = $0
response = $1
error = $2
semaphore.signal()
}
dataTask.resume()
_ = semaphore.wait(timeout: .distantFuture)
return (data, response, error)
}
}