My question is i want to hit the url and when i hit the url on server side the php return the results just echo in php and i have to save that result in variable in swift 3, i tried the below code:
let URLstr = URL(string: strURL)
let request = URLRequest(url: URLstr!)
request.httpMethod = "POST"
print (request)
I didn't get the content of URL in swift which is much easier in objective C.
Use the string initializer with the url.
do {
let contents = try String(contentsOf: URLstr, encoding: .ascii)
} catch {
// handle error
}
Or you can use URLSession.
let task = URLSession.shared.dataTask(with: URLStr) { data, response, error in
guard data != nil else { // no data }
let contents = String(data: data!, encoding: .ascii)
}
task.resume()
I adjusted the code provided above. To fetch HTML code use URLSession.
Swift 5
let session = URLSession.shared
let url = URL(string: "https://yourwebsiteaddress.com/")!
let task = session.dataTask(with: url) { data, response, error in
// Check whether data is not nil
guard let loadedData = data else { return }
// Load HTML code as string
let contents = String(data: loadedData, encoding: .utf8)
print(contents)
}
task.resume()
Related
Trying to execute a call from Swift passing one parameter to PHP and getting the result
It does not execute the PHP call... not sure why?
func getInfo(_ dataValue:String){
print("in UserModel.getInfo")
let url: URL = URL(string: urlInfoPath)!
let rq = NSMutableURLRequest(url: url)
rq.httpMethod = "POST"
let postString = "a=\(dataValue)"
rq.httpBody = postString.data(using: String.Encoding.utf8)
print("PHP postString:", postString)
let defaultSession = Foundation.URLSession(configuration: URLSessionConfiguration.default)
let task = defaultSession.dataTask(with: url) {
data, response, error in
print("UserModel.getINFO FROM PHP");
if error != nil {
print("error=\(String(describing: error))")
return
}
let val = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
self.responseString = val! as String
print("responseString = ", self.responseString)
}
}
With my program I try to login and scrape the home page, however after I log in with a post request (in which the response says successful), when I try to get the home page it says my session has timed out.
I've tried using different types of session, modifying minor parts of the code, and Alamofire with no success
import Foundation
let session: URLSession = {
let configuration = URLSessionConfiguration.default
configuration.timeoutIntervalForRequest = 30 // seconds
configuration.timeoutIntervalForResource = 30 // seconds
return URLSession(configuration: .default)
}()
let url = URL(string: "examplesite.com")!
var request = URLRequest(url: url)
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField:
"Content-Type")
request.httpMethod = "POST"
let postString = "Email=exampleemail&Password=examplepass"
request.httpBody = postString.data(using: .utf8)
//log in
session.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else {
// check for fundamental networking error
print("\(error)")
return
}
if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode
!= 200 { // check for http errors
print("\(httpStatus.statusCode)")
print("\(response)")
}
let responseString = String(data: data, encoding: .utf8)
print("\(responseString)")
let urlnext = URL(string: "example.com/HomePage")!
//get page after loggin in
session.dataTask(with: urlnext) { datanext, responsenext, errornext in
guard let datanext = datanext, errornext == nil else {
print("\(errornext)")
return
}
let stringnext = String(data: datanext, encoding: .utf8)
//get page html
print("\(stringnext)")
}.resume()
}.resume()
// Infinitely run the main loop to wait for our request.
// Only necessary if you are testing in the command line.
RunLoop.main.run()
the results are a successful login {\"msg\":\"\",\"valid\":\"1\"}, and the html code of a time out page instead of the home page
I'm following an iOS Swift guide on Udemy and this is the first issue I cannot work around:
I am supposed to see html etc printed to the console but instead I get null.
This is the section:
let url = NSURL(string: "https://google.com")
let task = NSURLSession.sharedSession().dataTaskWithURL(url!) {
(data, response, error) in
if error == nil {
var urlContent = NSString(data: data!, encoding: NSUTF8StringEncoding)
print(urlContent)
}
}
task.resume()
If I print just the data then it gives me some content back but when its encoded its nil.
Any help? Cannot move onto the next part until this is resolved.
The problem there as already mentioned by rmaddy it is the encoding you are using. You need to use NSASCIIStringEncoding.
if let url = URL(string: "https://www.google.com") {
URLSession.shared.dataTask(with: url) {
data, response, error in
guard
let httpURLResponse = response as? HTTPURLResponse, httpURLResponse.statusCode == 200,
let data = data, error == nil,
let urlContent = String(data: data, encoding: .ascii)
else { return }
print(urlContent)
}.resume()
}
Or taking a clue from Martin R you can detect the string encoding from the response:
extension String {
var textEncodingToStringEncoding: Encoding {
return Encoding(rawValue: CFStringConvertEncodingToNSStringEncoding(CFStringConvertIANACharSetNameToEncoding(self as CFString)))
}
}
if let url = URL(string: "https://www.google.com") {
URLSession.shared.dataTask(with: url) {
data, response, error in
guard
let httpURLResponse = response as? HTTPURLResponse, httpURLResponse.statusCode == 200,
let data = data, error == nil,
let textEncoding = response?.textEncodingName,
let urlContent = String(data: data, encoding: textEncoding.textEncodingToStringEncoding)
else { return }
print(urlContent)
}.resume()
}
I am trying to get HTML content from a website so I can display data within an app. How can I make a call for the HTML code in Swift 3?
Are you trying to actually load a webpage on the screen or just retrieve the HTML source as a String/Data object?
If you just need the HTML as a response object you can do something like the following:
if let url = URL(string: "http://www.example-url.com") {
let request = URLRequest(url: url)
let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
if error != nil {
print(error!)
} else {
if let unwrappedData = data {
let dataString = String(data: unwrappedData, encoding: .utf8)
// …handle string here…
}
}
}
task.resume()
}
Use UIWebView.
e.g.
let webView = UIWebView()
let url = URL(string: "http://yourwebsite")
let request = URLRequest(url: url)
webView.loadRequest(request)
I have been following this tutorial to learn Swift and I have a few questions on the way they do things.
Specifically here:
let paramString = "data=Hello"
request.HTTPBody = paramString.dataUsingEncoding(NSUTF8StringEncoding)
let task = session.dataTaskWithRequest(request) {
(data, response, error) in
guard let _:NSData = data, let _:NSURLResponse = response where error == nil else {
print("Error")
return
}
let dataString = NSString(data: data!, encoding: NSUTF8StringEncoding)
print(dataString)
}
Why is (data, response, error) in always used in NSURLSessions? What does this line of code mean? Also, why does he have a guard statement underneath?
The whole section of code is here:
func dataRequest() {
let urlToRequest: String = " http://www.kaleidosblog.com/tutorial/nsurlsession_tutorial.php"
let url: NSURL = NSURL(string: urlToRequest)!
let session = NSURLSession.sharedSession()
let request = NSMutableURLRequest(URL: url)
request.HTTPMethod = "POST"
request.cachePolicy = NSURLRequestCachePolicy.ReloadIgnoringCacheData
let paramString = "data=Hello"
request.HTTPBody = paramString.dataUsingEncoding(NSUTF8StringEncoding)
let task = session.dataTaskWithRequest(request) {
(data, response, error) in
guard let _:NSData = data, let _:NSURLResponse = response where error == nil else {
print("Error")
return
}
let dataString = NSString(data: data!, encoding: NSUTF8StringEncoding)
print(dataString)
}
task.resume()
}
With NSURLSession you make asynchronous calls, meaning that you make / start a network request and your program continues running - it doesn't stop waiting for response. Then, when your response is ready a completion block gets called / executed. So you need a way to access the data that's coming to you with this response. This data is accessible to you with (data, response, error) properties. This are just the names of those properties, so that you know how to use them. You could have different names, but it would be confusing to anyone else.
You use the guard statement because you can't be sure that you actually have the data or the response. It could be nil if an error occurred (timeout, ...). In such case (if there's an error) you just print "Error" to the console and call return, which makes you leave the completion block without executing the lines let dataString = NSString(data: data!, encoding: NSUTF8StringEncoding) and print(dataString). Of course, if you have the data and the response and error == nil you skip the else block of the guard statement and you just execute you last two lines of code in the block.