//GET text FROM SERVER
let requestText = NSMutableURLRequest(url: URL(string: "Http://a.txt")!, ...)
let sessionText = URLSession.shared
let downloadText = sessionText.dataTask(with: requestText as URLRequest) {data,response,error in
......
}
DispatchQueue.main.async {
//Update your UI here
}
}//dataTask
downloadText.resume()
//GET pic FROM SERVER
let requestText = NSMutableURLRequest(url: URL(string: "Http://a.jpg")!, ...)
let sessionPic = URLSession.shared
let downloadPic = sessionPic.dataTask(with: requestText as URLRequest) {data,response,error in
......
}
DispatchQueue.main.async {
//Update your UI here
}
}//dataTask
downloadPic.resume()
Hi, am not an expert in swift but I have a page the I would like to download pic (into UIImageView) and text (into UITextView) from a server. If I have multiple pics and text, must I run multiple session, request and Task.resume(), DispatchQueue.main.async ?
Is there way to get multiple request doing a single xxxx.resume()?
Thank you
Related
I am trying to create an app that creates random pictures when a button is clicked. The app is working fine but I see this message which I have never seen before."Publish changes from background threads is not allowed; make sure to publish values from the main thread.".
I am new to SwiftUI, help is appreciated.
import Foundation
import SwiftUI
class ImageviewModel{
var image: UIImage? = nil
//let url = URL(string: "https://source.unsplash.com/random/600x600")!
let url = URL(string: "https://picsum.photos/600/600")!
func responseHandler(data: Data?, response: URLResponse?) ->
UIImage?{
guard let data = data,
let image = UIImage(data: data),
let response = response else {return nil}
return image
}
func loadImageWithAsync() async throws -> UIImage?{
do{
let (data, response) = try await URLSession.shared.data(from: url,delegate: nil)
return responseHandler(data: data, response: response)
} catch{
throw error
}
}
}
class ViewModel: ObservableObject{
#Published var image: UIImage? = nil
var loader = ImageviewModel()
func fetchImage() async {
let image = try? await loader.loadImageWithAsync()
self.image = image
}
}
You need to add the MainActor wrapper to the class to guarantee that updates are done on Main
#MainActor
class ViewModel: ObservableObject{
I have used the below implementation to play a video with cookies content from the server, but it shows play icon with cross line. I have refer the link and do following implementation in swift. but I didn't get any output :(
func showVideo(url: String) {
let videoURL = NSURL(string: url)
var cookiesArray = [HTTPCookie]()
guard let cookieArray = UserDefaults.standard.array(forKey:
Constants.Object.kCookie) as? [[HTTPCookiePropertyKey: Any]] else {
return }
for cookieProperties in cookieArray {
if let cookie = HTTPCookie(properties: cookieProperties) {
cookiesArray.append(cookie)
}
}
let cookieArrayOptions = [AVURLAssetHTTPCookiesKey: cookiesArray]
let assets = AVURLAsset(url: videoURL! as URL, options: cookieArrayOptions)
let item = AVPlayerItem(asset: assets)
videoPlayer = AVPlayer(playerItem: item)
self.playerController.player = self.videoPlayer
self.playerController.view.frame = self.view.frame
self.present(self.playerController, animated: true, completion: nil)
self.playerController.player?.play()
}
Please help me on that, what is wrong in that implementation.
Thanks in advance! :)
After going through so many ways finally I have got the solution which worked for me :
func showVideo(url: String) {
let videoURL = NSURL(string: url)
let cookiesArray = HTTPCookieStorage.shared.cookies! //Stored Cookies of your request
let values = HTTPCookie.requestHeaderFields(with: cookiesArray)// Returns a dictionary of header fields corresponding to a provided array of cookies.ex.["Cookie":"your cookies values"]
let cookieArrayOptions = ["AVURLAssetHTTPHeaderFieldsKey": values]
let assets = AVURLAsset(url: videoURL! as URL, options: cookieArrayOptions)
let item = AVPlayerItem(asset: assets)
videoPlayer = AVPlayer(playerItem: item)
self.playerController.player = self.videoPlayer
self.playerController.view.frame = self.view.frame
self.present(self.playerController, animated: true, completion: nil)
self.playerController.player?.play()
}
I want to run this code in app applicationDidEnterBackground mode. But app don't work in background mode (after press home button).
func request(urlreq : String,post :String?, completionHandler: #escaping (HTTPURLResponse?,JSON?) -> ()){
let url = NSURL(string: API_URL + urlreq )
let request = NSMutableURLRequest(url: url! as URL)
request.setValue(USER_AGENT, forHTTPHeaderField: "User-Agent")
request.httpMethod = "GET"
if(post != nil){
request.httpMethod = "POST"
request.addValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.httpBody = post!.data(using: String.Encoding.utf8)
}
let config = URLSessionConfiguration.default
let session = URLSession(configuration: config)
session.dataTask(with: request as URLRequest, completionHandler: { (returnData, response, error) -> Void in
if(returnData != nil)
{
let json = JSON(data: (returnData as NSData!) as Data, error: nil)
completionHandler(response as? HTTPURLResponse,json)
}else{
completionHandler(response as? HTTPURLResponse,nil)
}
}).resume()
}
I'm using swift 3. I want to add timeout to URLSession when doing download task. I did use configuration to change my setting, however, it doesn't work. The code didn't perform timeout... If the server didn't response quickly, it will fail.
Here is my code:
import Foundation
import UIKit
extension UIImageView {
func loadImage(url: URL) -> URLSessionDownloadTask {
let session: URLSession = {
let configuration = URLSessionConfiguration.default
configuration.timeoutIntervalForRequest = 70
configuration.timeoutIntervalForResource = 70
return URLSession(configuration: configuration, delegate: nil, delegateQueue: nil)
}()
let downloadTask = session.downloadTask(with: url, completionHandler: { [weak self] url, response, error in
if error == nil, let url = url, let data = try? Data(contentsOf: url), let image = UIImage(data: data) {
DispatchQueue.main.async {
if let strongSelf = self {
strongSelf.image = image
}
}
}
})
downloadTask.resume()
return downloadTask
}
}
Any comment is appreciated!!
I have a downloader class that downloads a file based on a given URL which then calls a completion passing it the contents of the file as NSData.
For the project that I'm using this in, the URL will be a JPEG image. The downloader works perfectly; I can use the result into NSImage and show it in a Image View Controller.
I would like to be able to save that NSData object to file.
After quite some time researching the internet on Google, StackOverflow, etc. and trying many suggestions, I cannot get the file to save.
Here is a playground of the Downloader class and my attempt to save the file:
//: Playground - noun: a place where people can play
import Cocoa
class NetworkService
{
lazy var configuration: URLSessionConfiguration = URLSessionConfiguration.default
lazy var session: URLSession = URLSession(configuration: self.configuration)
let url: NSURL
init(url: NSURL)
{
self.url = url
}
func downloadImage(completion: #escaping ((NSData) -> Void))
{
let request = NSURLRequest(url: self.url as URL)
let dataTask = session.dataTask(with: request as URLRequest) { (data, response, error) in
if error == nil {
if let httpResponse = response as? HTTPURLResponse {
switch (httpResponse.statusCode) {
case 200:
if let data = data {
completion(data as NSData)
}
default:
print(httpResponse.statusCode)
}
}
} else {
print("Error download data: \(error?.localizedDescription)")
}
}
dataTask.resume()
}
}
let IMAGE_URL = NSURL(string: "https://www.bing.com/az/hprichbg/rb/RossFountain_EN-AU11490955168_1920x1080.jpg")
let networkService = NetworkService(url: IMAGE_URL!)
networkService.downloadImage(completion: { (data) in
data.write(to: URL(string: "file://~/Pictures/image.jpg")!, atomically: false)
})
The playground console show nothing at all. Can anyone spot why its not working?
NOTE: The target is macOS, not iOS. Also, I'm a swift noob...
I did try this:
networkService.downloadImage(completion: { (imageData) in
let imageAsNSImage = NSImage(data: imageData as Data)
if let bits = imageAsNSImage?.representations.first as? NSBitmapImageRep {
let outputData = bits.representation(using: .JPEG, properties: [:])
do {
try outputData?.write(to: URL(string: "file://~/Pictures/myImage.jpg")!)
} catch {
print("ERROR!")
}
}
})
It could be a permission issue. You may try:
let picturesDirectory = FileManager.default.urls(for: .picturesDirectory, in: .userDomainMask)[0]
let imageUrl = picturesDirectory.appendingPathComponent("image.jpg", isDirectory: false)
try? data.write(to: imageUrl)
It does work for me: