I want to download some items from my host,
but now I get a warning:
'connectionWithRequest:delegate:'is deprecated in iOS9.0 - Use NSURLSession'
I've searched everywhere, but unfortunately I couldn't find any solution.
Can you help me?
My code looks like this:
- (void)downloadItems
{
// Download the json file
NSURL *jsonFileUrl = [NSURL URLWithString:#"http://myhost.com/test.php"];
// Create the request
NSURLRequest *urlRequest = [[NSURLRequest alloc] initWithURL:jsonFileUrl];
// Create the NSURLConnection
[NSURLConnection connectionWithRequest:urlRequest delegate:self];
}
#pragma mark NSURLConnectionDataProtocol Methods
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
// Initialize the data object
_downloadedData = [[NSMutableData alloc] init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// Append the newly downloaded data
[_downloadedData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// Create an array to store the locations
NSMutableArray *_locations = [[NSMutableArray alloc] init];
// Parse the JSON that came in
NSError *error;
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:_downloadedData options:NSJSONReadingAllowFragments error:&error];
// Loop through Json objects, create question objects and add them to our questions array
for (int i = 0; i < jsonArray.count; i++)
{
NSDictionary *jsonElement = jsonArray[i];
// Create a new location object and set its props to JsonElement properties
Location *newLocation = [[Location alloc] init];
newLocation.idS = jsonElement[#"idStatistic"];
newLocation.temp = jsonElement[#"temp"];
newLocation.hum = jsonElement[#"hum"];
newLocation.date_time = jsonElement[#"date_time"];
// Add this question to the locations array
[_locations addObject:newLocation];
}
// Ready to notify delegate that data is ready and pass back items
if (self.delegate)
{
[self.delegate itemsDownloaded:_locations];
}
}
Replacing NSURLConnection line with:
NSURLSession *session = [NSURLSession sharedSession];
[[session dataTaskWithURL:jsonFileUrl
completionHandler:^(NSData *data,
NSURLResponse *response,
NSError *error) {
// handle response
}] resume];
Related
I get the following _downloadedData:
<!-- pageok -->
<!-- managed by puppet -->
<html>
<pre>pageok</pre>
</html>
When using the code listed below:
- (void)downloadItems
{
//Download the json file
NSURL *jsonFileUrl = [NSURL URLWithString:#"http://www.scratchclass.com:80/videos/"];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:jsonFileUrl];
[request setHTTPMethod:#"GET"];
[request setValue:#"text/html" forHTTPHeaderField:#"Content-Type"];
[request setValue:#"gzip" forHTTPHeaderField:#"Content-Encoding"];
NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
if(!connection){
NSLog(#"Connection Failed");
}
}
#pragma mark NSURLConnectionDataProtocol Methods
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
NSLog(#"didReceiveResponse: %#",response);
// Initialize the data object
_downloadedData = [[NSMutableData alloc] init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// Append the newly downloaded data
[_downloadedData appendData:data];
NSString* newStr = [[NSString alloc] initWithData:_downloadedData encoding:NSUTF8StringEncoding ];
NSLog(#"didReceiveData: %#",newStr);
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// Create an array to store the videos
NSMutableArray *_videos = [[NSMutableArray alloc] init];
// Parse the JSON that came in
NSError *error;
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:_downloadedData options:NSJSONReadingMutableContainers error:&error];
NSLog(#"Connection failed! Error - %# %#",
[error localizedDescription],
[[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);
// Loop through Json objects, create question objects and add them to our questions array
for (int i = 0; i < jsonArray.count; i++)
{
NSDictionary *jsonElement = jsonArray[i];
// Create a new video object and set its props to JsonElement properties
GetVideos1 *testVideo = [[GetVideos1 alloc] init];
testVideo.IDVideo = jsonElement[#"IDVideo"];
testVideo.title = jsonElement[#"title"];
// Add this question to the locations array
[_videos addObject:testVideo];
}
// Ready to notify delegate that data is ready and pass back items
if (self.delegate)
{
[self.delegate itemsDownloaded:_videos];
}
}
json is actually:
[{"IDVideo":"6Joup252fR0","title":"Top 30 Baseball
Plays"},{"IDVideo":"aAy3Sh_RXjc","title":"MLB top
plays"},{"IDVideo":"bkiaAGOoLjc","title":"Top 50 most unforgettable
ejections"}]
But I cannot get to the data as it is part of the #text node name. How can I fetch the data?
Here is the php code that was used:
<?php
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// Constructor - open DB connection
function __construct() {
$this->db = new mysqli('idirectorySQL.db.9960960.hostedresource.com', 'idirectorySQL', 'iDirectory70!', 'idirectorySQL');
$this->db->autocommit(FALSE);
}
$con=mysqli_connect('idirectorySQL.db.9960960.hostedresource.com', 'idirectorySQL', 'iDirectory70!', 'idirectorySQL');
// This SQL statement selects ALL from the table 'videos'
$sql = "SELECT IDVideo,title FROM videos";
// Check if there are results
if ($result = mysqli_query($con, $sql)) {
// If so, then create a results array and a temporary one
// to hold the data
$resultArray = array();
$tempArray = array();
// Loop through each row in the result set
while($row = $result->fetch_object()) {
// Add each row into our results array
$tempArray = $row;
array_push($resultArray, $tempArray);
}
// Close connections
mysqli_close($con);
// Finally, encode the array to JSON and output the results
header('Content-type: application/json');
// echo json_encode($resultArray, JSON_PRETTY_PRINT);
echo json_encode($resultArray);
}
?>
I used
header('Content-type:application/x-www-form-urlencoded')
but I still received the same message. Also, this is what reads from the request headers:
Accept text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
Don't set any custom parameters in the NSURLRequest, GET is the default anyway.
As NSURLConnection is deprecated, this is a solution with the recommended NSURLSession API
NSURL *url = [NSURL URLWithString:#"http://www.scratchclass.com:80/videos/"];
NSURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[[[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData * data, NSURLResponse * response, NSError * error) {
if (error) {
NSLog(#"Connection failed! Error - %# %#",
[error localizedDescription],
[[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);
} else {
NSError *jsonError;
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&jsonError];
if (jsonError) {
NSLog(#"NSJSONSerialization failed! Error - %# %#",
[jsonError localizedDescription],
[[jsonError userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);
} else {
NSMutableArray *videos = [[NSMutableArray alloc] init];
for (NSDictionary *item in jsonArray) {
GetVideos1 *testVideo = [[GetVideos1 alloc] init];
testVideo.IDVideo = item[#"IDVideo"];
testVideo.title = item[#"title"];
// Add this question to the locations array
[videos addObject:item];
}
if (self.delegate) {
[self.delegate itemsDownloaded:videos];
}
}
}
}] resume];
I am trying to call a web service. I tried this
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:#"http://192.168.75.1:8082/projectname/public/tests"]];
NSURLSessionConfiguration *configuration = [ NSURLSessionConfiguration ephemeralSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration];
NSURLSessionDownloadTask *task = [session downloadTaskWithRequest:request completionHandler:^(NSURL *localFile, NSURLResponse *response, NSError *error) {
if(!error){
NSLog(#"no error");
}else{
NSLog(#"error");
}
}];
[task resume];
}
as you see there are two nslog statements. I got the no error one.
when I call that web service from my safari, I got a simple string which is index printed in the browser, how can I see that string in my xcode please?
Thanks
you can implement the delegate method
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location;
EDIT
Try This
NSHTTPURLResponse *response = nil;
NSError *error = nil;
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:YOUR URL]];
NSData *respData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
NSLog(#"~~~~~ Status code: %d", [response statusCode]);
//Print your recived data here..
NSString *str = [[NSString alloc] initWithData:respData encoding:NSUTF8StringEncoding];
NSLog(#"str: %#", str);
You can use the delegate methods. When a NSURLSessionDownlaodTask is completed, it's delegates will be called if your class confirmed to it.
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location
you can get your response by parsing the data in that delegate method. It will tell you the location that the URLSession stores the downloaded result.
what I would do If I were you is:
NOTE: it is based on you said you receive a simple string only from your back-end. if that is not a simple string, you may need to revise the –connectionDidFinishLoading: method's body.
.h
#interface UIRandomViewController : UIViewController {
NSURLConnection *_urlConnection;
NSMutableData *_receivedData;
// ...
}
// ...
#end
.m
#implementation UIRandomViewController {
// ...
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
NSURLRequest *_request = [NSURLRequest requestWithURL:[NSURL URLWithString:#"http://192.168.75.1:8082/projectname/public/tests"]];
_urlConnection = [[NSURLConnection alloc] initWithRequest:_request delegate:self startImmediately:TRUE];
// ...
}
// ...
#pragma mark - <NSURLConnectionDelegate>
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
_receivedData = nil;
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
if (_receivedData == nil) _receivedData = [NSMutableData dataWithData:data];
else [_receivedData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSString *_receivedString = [[NSString alloc] initWithData:_receivedData encoding:NSUTF8StringEncoding];
// hello beautiful...
NSLog(#"received data : %#", _receivedString);
}
}
#end
I created a class customDownload with the following methods:
-(NSString *) getTextFromLink: (PreliteRequest *) requestDetails
asyncConnection: (BOOL) isAsync
callbackMethod: (SEL) methodToExecute {
mainRequest = requestDetails;
NSMutableURLRequest *postRequest = [[NSMutableURLRequest alloc] init];
NSURLRequest *getRequest = [[NSURLRequest alloc] init];
NSURLConnection *connection;
NSURLResponse * response = nil;
NSError * error = nil;
if ([[requestDetails getType] isEqualToString:#"POST"]) {
[postRequest setURL:[NSURL URLWithString:[requestDetails getUrl]]];
[postRequest setHTTPMethod:[requestDetails getType]];
[postRequest setValue:[requestDetails getPostLenght] forHTTPHeaderField:#"Content-Length"];
[postRequest setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[postRequest setHTTPBody:[requestDetails getPostParameters]];
if (isAsync) {
tmpMethod = methodToExecute;
connection = [[NSURLConnection alloc] initWithRequest:postRequest delegate:self];
} else
downloadedData = (NSMutableData *)[NSURLConnection sendSynchronousRequest:postRequest returningResponse:&response error:&error];
} else {
getRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:[NSString stringWithFormat:#"%#%#",[requestDetails getUrl],[requestDetails getGetParameters]]]];
if (isAsync) {
tmpMethod = methodToExecute;
connection = [[NSURLConnection alloc] initWithRequest:getRequest delegate:self];
} else
downloadedData = (NSMutableData *)[NSURLConnection sendSynchronousRequest:getRequest returningResponse:&response error:&error];
}
NSString *result=[[NSString alloc]initWithData:downloadedData encoding:NSUTF8StringEncoding];
return result;
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
downloadedData = [[NSMutableData alloc] init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
// Append the new data to the instance variable you declared
[downloadedData appendData:data];
}
- (NSCachedURLResponse *)connection:(NSURLConnection *)connection
willCacheResponse:(NSCachedURLResponse*)cachedResponse {
return nil;
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
NSString *tmpResult = [[NSString alloc]initWithData:downloadedData encoding:NSUTF8StringEncoding];
[self performSelector:tmpMethod withObject:tmpResult];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
NSLog(#"Connection error: %#",error);
}
In my view controller I declare the previous class and call the only method of that class getTextFromLink.
download = [[customDownload alloc] init];
[download getTextFromLink:request asyncConnection:YES callbackMethod:tmpSelector];
SEL tmpSelector = #selector(printResult:);
-(void) printResult:(NSString *) resultToPrint {
NSLog(#"Risultato: %#",resultToPrint);
}
I pass to getTextFromLink the tmpSelector as parameter because that is the method I would like to call as soon the getTextFromDownloadLink has finished its job.
Actually getTextFromLink execute an asynchronous connection.
What I'm trying to do is to execute something when the asyncronous connection finished to download datas.
I would like to create a callback custom class to do this.
Can anyone help me?
Rather than this selector model, generally people would use blocks for this. For example, define a typedef for your block:
typedef void(^PreliteRequestCompletionHandler)(NSString *string);
Since you're dealing with an asynchronous pattern, you might want to define a property which you can use to save this completion handler to call later:
#property (nonatomic, copy) PreliteRequestCompletionHandler completionHandler;
You can then change that selector parameter to be a block parameter:
-(NSString *) getTextFromLink: (PreliteRequest *) requestDetails
asyncConnection: (BOOL) isAsync
completionHandler: (PreliteRequestCompletionHandler)completionHandler {
self.completionHandler = completionHandler;
// do stuff
}
And then, when you want to call that completion block, you do something like:
NSString *result = ...;
if (self.completionHandler) {
self.completionHandler(result);
}
And then you can now use this new block parameter to your method:
download = [[customDownload alloc] init];
[download getTextFromLink:request asyncConnection:YES completionHandler:^(NSString *result) {
NSLog(#"Risultato: %#", result);
}];
I am using a button action to update the value of a MySQL table field. The update is perform in the web server, but I need to update a UILabel text in my view Controller.
This is the code I have implemented:
- (IBAction)votarAction:(id)sender {
//URL definition where php file is hosted
dispatch_queue_t backgroundQueue = dispatch_queue_create("com.mycompany.myqueue", 0);
dispatch_async(backgroundQueue, ^{
int categoriaID = [[detalleDescription objectForKey:#"idEmpresa"] intValue];
NSString *string = [NSString stringWithFormat:#"%d", categoriaID];
NSLog(#"ID EMPRESA %#",string);
NSMutableString *ms = [[NSMutableString alloc] initWithString:#"http://mujercanariasigloxxi.appgestion.eu/app_php_files/cambiarvaloracionempresa.php?id="];
[ms appendString:string];
// URL request
NSLog(#"URL = %#",ms);
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:ms]];
//URL connection to the internet
NSURLConnection *connection=[[NSURLConnection alloc]initWithRequest:request delegate:self];
dispatch_async(dispatch_get_main_queue(), ^{
//update your label
});
});
}
#pragma NSURLConnection Delegate Methods
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
//buffer is the object Of NSMutableData and it is global,so declare it in .h file
buffer = [NSMutableData data];
NSLog(#"ESTOY EN didReceiveResponse*********");
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
NSLog(#"ESTOY EN didReceiveDATA*********");
[buffer appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
//Here You will get the whole data
NSLog(#"ESTOY EN didFINISHLOADING*********");
NSError *jsonParsingError = nil;
NSArray *array = [NSJSONSerialization JSONObjectWithData:buffer options:0 error:&jsonParsingError];
//And you can used this array
NSLog(#"ARRAY = %#",array);
//HERE LABEL.TEXT UPDATE CODE
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(#"ERROR de PARSING");
NSLog(#"ESTOY EN didFAILWITHERROR*********");
}
As I told you, the field value at the MySQL table is updated every time the button is tapped, but the problem is that the NSURLConnection delegate methods are never called.
Any help is welcome
In your view controller's header file add: <NSURLConnectionDelegate>
Also, there's no need to throw the NSURLConnection into a seperate background process, maybe that's why the delegates aren't called. NSURLConnection is already asynchronous
Perhaps try something like this:
- (IBAction)votarAction:(id)sender
{
int categoriaID = [[detalleDescription objectForKey:#"idEmpresa"] intValue];
NSString *originalString = [NSString stringWithFormat:#"%d", categoriaID];
NSMutableString *mutablesString = [[NSMutableString alloc] initWithString:#"http://mujercanariasigloxxi.appgestion.eu/app_php_files/cambiarvaloracionempresa.php?id="];
[mutableString appendString:originalString];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:mutableString]];
request.cachePolicy = NSURLRequestReloadIgnoringLocalAndRemoteCacheData;
request.timeoutInterval = 5.0;
[NSURLConnection sendAsynchronousRequest:request
queue:[NSOperationQueue mainQueue]
completionHandler:
^(NSURLResponse *response, NSData *data, NSError *connectionError)
{
if (data)
{
NSArray *array = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
dispatch_async(dispatch_get_main_queue(), ^
{
// Update your label
self.label.text = [array objectAtIndex:someIndex];
});
}
else
{
// Tell user there's no internet or data failed
}
}];
}
I have set up a simple Objective-C class in my iOS app which has one simple task, to download a JSON file, parse it and then pass back a NSString which contains a variable parsed from the downloaded JSON file.
The problem I have is that I am calling this class from another class and this all works great however I need to pass back the NSString to the class from which I am calling it from.
The problem is that the method passes back the empty NSString BEFORE connectionDidFinishLoading happens.... And so the NSString never gets assigned a string......
I have setup a while loop in my method but it doesn't really work.....
here is my code:
-(NSString *)get_user_icon:(NSString *)YT_ID {
// Set BOOL to 0 for initial setup.
icon_check = 0;
NSString *url_YT = [NSString stringWithFormat:YOUT_profile_part_2, YT_ID];
dispatch_queue_t downloadQueue = dispatch_queue_create("Icon downloader YouTube", NULL);
dispatch_async(downloadQueue, ^{
dispatch_async(dispatch_get_main_queue(), ^{
NSURLRequest *theRequest_YT = [NSURLRequest requestWithURL:[NSURL URLWithString:url_YT]];
NSURLConnection *theConnection_YT = [[NSURLConnection alloc] initWithRequest:theRequest_YT delegate:self];
if (theConnection_YT) {
YT_JSON_FEED = [[NSMutableData alloc] init];
NSLog(#"Respoce happening...");
}
else {
NSLog(#"failed");
}
});
});
while (icon_check == 0) {
NSLog(#"Wait");
}
return icon_url;
}
/// Data loading ///
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[YT_JSON_FEED setLength:0];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[YT_JSON_FEED appendData:data];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSString *msg = [NSString stringWithFormat:#"Failed: %#", [error description]];
NSLog(#"%#",msg);
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSError *myError = nil;
NSDictionary *feed = [NSJSONSerialization JSONObjectWithData:YT_JSON_FEED options:NSJSONReadingMutableLeaves error:&myError];
icon_url = [[[[[feed objectForKey:#"items"] valueForKey:#"snippet"] valueForKey:#"thumbnails"] valueForKey:#"default"] valueForKey:#"url"];
icon_check = 1;
}
For a synchronous request (blocking until there is something to return), use NSURLConnection's sendSynchronousRequest:returningResponse:error: instead. Like so:
-(NSString *)get_user_icon:(NSString *)YT_ID {
NSString *url_YT = [NSString stringWithFormat:YOUT_profile_part_2, YT_ID];
NSURLRequest *theRequest_YT = [NSURLRequest requestWithURL:[NSURL URLWithString:url_YT]];
NSURLResponse* response = nil;
NSError* error = nil;
NSData* data = [NSURLConnection sendSynchronousRequest:theRequest_YT returningResponse:&response error:&error];
//Check response and error for possible errors here.
//If no errors.
NSDictionary *feed = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&myError];
icon_url = [[[[[feed objectForKey:#"items"] valueForKey:#"snippet"] valueForKey:#"thumbnails"] valueForKey:#"default"] valueForKey:#"url"];
return icon_url;
}
However this is not recommended. You need to change your API to be asynchronous. Either delegate-based, but more preferably, using block-based API.