I am trying get data from server to store locally when needed. The data is present at different api urls. I want to call all those apis on a single refresh click.Kindly help me to solve this.
-(void) call:(NSString *)url{
NSURLRequest *Request1 = [NSURLRequest requestWithURL :[NSURL URLWithString:url] cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:30.0];
// calling only one api
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:Request1 delegate:self startImmediately:YES];
// flag = true;
[SVProgressHUD showWithStatus:#"Wait while we fetch data .."];
if (connection){
NSLog(#"connection success");
}
else{
// handle error here
}
}
Related
I have a nested loop of sending the request.
-(void) download
{
for(NSString *id in array)
{
//init with request and start the connection
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy: NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request deletegate:self];
[conn start];
}
}
-(void) connection:(NSURLConnection *) connection didReceiveData:(NSData *) data
{
//enter here secondly
}
-(void) connectionDidFinishLoading:(NSURLConnection *) connection
{
//enter here last, after finish the for loop
//my intention is use the downloaded data to do something before sending a new request.
}
The problem is that I want to enter "-(void) connectionDidFinishLoading:(NSURLConnection *) connection" first before send the request again in the for loop.
But currently it will finish the for loop and sent all the request before enter to "-(void) connectionDidFinishLoading:(NSURLConnection *) connection".
You Should Try This NSURLConnection is deprecated in iOS9
for (NSString *URL in URLArray) {
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];
NSURLSessionTask *task = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
// check error and/or handle response here
}];
[task resume];
}
and use dispatch_group_t group = dispatch_group_create();
add line to for loop dispatch_group_enter(group); will call
dispatch_group_notify(group, dispatch_get_main_queue(), ^{
// Request Finish
});
for your goal
In your case you need to try block function because as per your requirement you want response of the first connection for another request.
for(NSString* url in array)
{
// Generate a NSURLRequest object from the address of the API.
NSURL *url = [NSURL URLWithString:urlLink];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
// Send the request asynchronous request using block!
[NSURLConnection sendAsynchronousRequest:request
queue:[NSOperationQueue mainQueue]
completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
if (error) {
NSLog(#"Error in updateInfoFromServer: %# %#", error, [error localizedDescription]);
} else if (!response) {
NSLog(#"Could not reach server!");
} else if (!data) {
NSLog(#"Server did not return any data!");
} else {
[self doStuffWithData:data];
}
}];
}
URL loading is not a synchronous operation (or at least should never be done synchronously), because it can take up to 90 seconds just for a DNS lookup failure, and almost infinitely long if the server keeps dribbling out data. If you block the main thread for even a fraction of that amount of time, iOS will kill your app.
Instead of scheduling the requests in a loop and waiting for them to finish, you need to schedule the first request (and only the first request). Then, in your connectionDidFinishLoading: method (and maybe your connection:DidFailWithError: method), schedule the next request.
With that said, unless you still need to support iOS 6/10.8 and earlier, you should probably be using NSURLSession. (The same general advice applies; the delegate method names are changed to protect the guilty.)
I am a beginer in iOS programming. I have some problem with NSURLConnection: I have installed SWRevealViewController https://github.com/John-Lluch/SWRevealViewController and when my app is loading Data from server, I can't use interaction with screen. I can't open my SWR-menu while Data is loading.
Here is my SWR in viewDidLoad:
SWRevealViewController *revealViewController = self.revealViewController;
if ( revealViewController ) {
[self.openMenyItmet setTarget: self.revealViewController];
[self.openMenyItmet setAction: #selector( revealToggle: )];
[self.view addGestureRecognizer:self.revealViewController.panGestureRecognizer];
}
After that, I called Get method in viewDidLoad:
[self GetQUIZ];
Method detail:
- (void)GetQUIZ {
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
NSString *url = [NSString stringWithFormat:#"http://stringlearning.com/api/v1/user-quiz?token=%#",[[NSUserDefaults standardUserDefaults] stringForKey:#"token"]];
[request setURL:[NSURL URLWithString: url]];
[request setHTTPMethod:#"GET"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setValue:[UIDevice currentDevice].name forHTTPHeaderField:#"device"];
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
NSLog(#"Left menu, User details: %#", [[NSString alloc] initWithData:[request HTTPBody] encoding:NSUTF8StringEncoding]);
NSLog(#"%#", [request allHTTPHeaderFields]);
if(conn) {
NSLog(#"Connection Successful");
} else
NSLog(#"Connection could not be made");
And then I use data in connectionDidFinishLoading:
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSError *deserr = nil;
NSDictionary *responseDict = [NSJSONSerialization JSONObjectWithData:responseData options: 0 error: &deserr];
I read that i should use async methods, but I never use it before. Would you write some detail solution ?
Maybe, does have different path?
I would be very grateful for the help!
I'd suggest starting with NSURLSession, which is a modern API that will accomplish the same thing, asynchronously.
To use NSURLSession, you need a few piece of the puzzle:
A web address to reach, and optionally any payload or custom headers.
An instance of NSURL: where you're downloading from and an NSURLRequest to wrap it in.
An NSURLSessionConfiguration, which handles things like caching, credentials and timeouts.
The session itself.
You need an NSURLSessionTask instance. This is the closest object to your NSURLConnection. It has callbacks via delegate or a completion block, if you just need to know when it finishes.
Here's how this would look in code:
// 1. The web address & headers
NSString *webAddress = [NSString stringWithFormat:#"http://stringlearning.com/api/v1/user-quiz?token=%#",[[NSUserDefaults standardUserDefaults] stringForKey:#"token"]];
NSDictionary <NSString *, NSString *> *headers = #{
#"device" : [UIDevice currentDevice].name,
#"Content-Type" : #"application/x-www-form-urlencoded"
};
// 2. An NSURL wrapped in an NSURLRequest
NSURL* url = [NSURL URLWithString:webAddress];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
// 3. An NSURLSession Configuration
NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];
[sessionConfiguration setHTTPAdditionalHeaders:headers];
// 4. The URLSession itself.
NSURLSession *urlSession = [NSURLSession sessionWithConfiguration:sessionConfiguration];
// 5. A session task: NSURLSessionDataTask or NSURLSessionDownloadTask
NSURLSessionDataTask *dataTask = [urlSession dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
}];
// 5b. Set the delegate if you did not use the completion handler initializer
// urlSession.delegate = self;
// 6. Finally, call resume on your task.
[dataTask resume];
This will run asynchronously, allowing your UI to remain responsive as your app loads data.
When you send a request on the main thread, like you are doing now, your UI, which is always performed on the main thread, is blocked, waiting for the request to finish and process. So you should perform all your network on a background thread, asynchronously. I would recommend first to check the networking library AFNetworking , it could simplify most of your networking problems.
Welcome to SO. You should know that NSURLConnection was deprecated in iOS 9. You should be using NSURLSession instead. The approach is very similar. You can take the NSURLRequest you've created and pass it to the sharedSession object, which is set up for async requests. The simplest way to deal with it is to use the call dataTaskWithRequest:completionHandler:, which takes a completion block. In your completion block you provide code that handles both success and failure.
I am using Box's iOS SDK (https://github.com/box/box-ios-sdk-v2) and I am trying to get a URL to stream videos that are uploaded to Box.
I tried using the following method on the BoxFilesResourceManager class, but I do not see any special fields on https://developers.box.com/docs/#folders-folder-object that would get me a streaming URL
- (BoxAPIJSONOperation *)fileInfoWithID:(NSString *)fileID requestBuilder:(BoxFilesRequestBuilder *)builder success:(BoxFileBlock)successBlock failure:(BoxAPIJSONFailureBlock)failureBlock;
The only potential way to get a URL may be for me to get a shared link of the file and try to stream from that, but I hardly doubt that will give me the correct URL
Thanks
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[NSString stringWithFormat:#"https://api.box.com/2.0/files/%#/content", fileId]]];
NSString *bearerToken = [NSString stringWithFormat:#"Bearer %#", accessToken]; // the access tokes must be valid(not expired)
[request addValue:bearerToken forHTTPHeaderField:#"Authorization"];
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[conn start];
// NSURLConnection Delegate method
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
NSLog(#"streamable url: %#", response.URL);
}
i am using singleton class for web service calling and display in uitableview ,My function is when i clicked submit button of new orchardname for new add then view redirect to tableview but data not seen which add recently. "singOrchard.orcharsList" it's orchard name array which i have to display. "[wOrchrad getorchardslist]" it's my web service call.
- (IBAction)Submit:(id)sender
{
if (Orchadname.text.length == 0) {
UIAlertView *message = [[UIAlertView alloc] initWithTitle:#"DataTree" message:#"Please Enter OrchardName" delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[message show];
}
else {
[singOrchard.orcharsList removeAllObjects];
NSString *urlStr = [NSString stringWithFormat:#"http://xyz.com"]; // Passing token to URL
NSURL *url = [NSURL URLWithString:urlStr];
NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url];
NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:req delegate:self]; // Support to perform URLrequest
if (theConnection) { // checking connection successfull or not
webData1 = [NSMutableData data];
NSLog(#"Orchard Name is %#", Orchadname.text);
}
[wOrchrad getorchardslist];
NSLog(#"ARRAY COUNT %#",singOrchard.orcharsList);
[self performSelector:#selector(gotodetails) withObject:nil afterDelay:4];
}
}
"[wOrchard getorchardslist]- Singletone+Webserviceutility"
- (void)getorchardslist
{
orchardsnames = [[NSMutableArray alloc] init];
singltoneclass = [SingletoneClass sharedInstanceMethod];
theRequest =[NSURLRequest requestWithURL:[NSURL URLWithString:[NSString stringWithFormat:#"http://www.xyz.com"]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
webData = [NSMutableData data];
[theConnection start];
}
You are not using the return result from theConnection. (At least not in your provided code.) Since you have set your class as the delegate, implement the NSURLConnectionDataDelegate methods.
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
use it to save your JSON data to an NSArray, which you can then use in your UITableView.
If you send your request asynchrounsly, don't forget to append the data with
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
Ok, this seems like it should be very simple - All I want to do is call my ServerConnect.m (NSObject), NSURL Connection Request Method, from my SignIn.m (ViewController) and stop the UIActivityIndicatorView after the NSURL Request has completed. Of course, if I do it all on the main thread:
- (IBAction)forgotPassword:(id)sender {
[activityIndicator startAnimating];
connection = [[ServerConnect alloc] init];
[connection sendUserPassword:email withSecurity:securityID];
[activityIndicator stopAnimating];
}
Then, everything will then execute concurrently, and the activity indicator will start and stop before the connection method finishes...
Thus, I attempted to place the connection request on a secondary thread:
- (IBAction)forgotPassword:(id)sender {
[NSThread detachNewThreadSelector: #selector(requestNewPassword:) toTarget:self withObject:userEmail.text];
}
- (void) requestNewPassword:(NSString *)email
{
[self->thinkingIndicator performSelectorOnMainThread:#selector(startAnimating) withObject:nil waitUntilDone:NO];
//Make NSURL Connection to server on secondary thread
NSString *securityID = [[NSString alloc] init];
securityID = #"security";
connection = [[ServerConnect alloc] init];
[connection sendUserPassword:email withSecurity:securityID];
[self->thinkingIndicator performSelectorOnMainThread:#selector(stopAnimating) withObject:nil waitUntilDone:NO];
}
But, I don't see the activity indicators here either, which may be due the NSURL Request not functioning properly on the secondary thread (i.e. for some reason, it does not gather an xml string as it does when requested on the main thread).
What is the proper way to architecture my code to make this work? I am surprised at how much work has been involved in trying to figure out how to get my activity indicator to simply stop after a method from another file has finished executing. Is there a way to run the code in series (one after another) and not concurrently? Any help would be appreciated.
Updated to Show: sendUserPassword:(NSString *)withSecurity:(NSString *)
- (void)sendUserPassword:(NSString *)emailString
withSecurity:(NSString *)passCode;
{
NSLog(#"Making request for user's password");
newUser = NO;
fbUser = NO;
forgotPassword = YES;
NSString *post = [NSString stringWithFormat: #"email=%#&s=%#", emailString, passCode];
NSData *postData = [post dataUsingEncoding:NSUTF8StringEncoding];
//Construct the web service URL
NSURL *url = [NSURL URLWithString:#"http://www.someurl.php"];
//Create a request object with that URL
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
cachePolicy:NSURLRequestReloadIgnoringCacheData
timeoutInterval:90];
[request setURL:url];
[request setHTTPMethod:#"POST"];
[request setHTTPBody:postData];
//Clear out the existing connection if there is one
if(connectionInProgress) {
[connectionInProgress cancel];
}
//Instantiate the object to hold all incoming data
xmlData = [[NSMutableData alloc] init];
//Create and initiate the conection - non-blocking
connectionInProgress = [[NSURLConnection alloc] initWithRequest: request
delegate:self
startImmediately:YES];
}
One suggestion try like this:
- (IBAction)forgotPassword:(id)sender
{
[self->thinkingIndicator startAnimating];
[NSThread detachNewThreadSelector: #selector(requestNewPassword:) toTarget:self withObject:userEmail.text];
}
- (void) requestNewPassword:(NSString *)email
{
//Make NSURL Connection to server on secondary thread
NSString *securityID = [[NSString alloc] init];
securityID = #"security";
connection = [[ServerConnect alloc] init];
[connection sendUserPassword:email withSecurity:securityID];
[self->thinkingIndicator performSelectorOnMainThread:#selector(stopAnimating) withObject:nil waitUntilDone:NO];
}
I ended up incorporating the NSNotification system (see Multithreading for iOS) to solve my problem. Any reason why this would be frowned upon:
"One easy way to send updates from one part of your code to another is Apple’s built-in NSNotification system.
It’s quite simple. You get the NSNotificationCenter singleton (via [NSNotificationCenter defaultCenter]) and:
1.) If you have an update you want to send, you call postNotificationName. You just give it a unique string you make up (such as “com.razeware.imagegrabber.imageupdated”) and an object (such as the ImageInfo that just finished downloading its image).
2.) If you want to find out when this update happens, you call addObserver:selector:name:object. In our case the ImageListViewController will want to know when this happens so it can reload the appropriate table view cell. A good spot to put this is in viewDidLoad.
3.) Don’t forget to call removeObserver:name:object when the view gets unloaded. Otherwise, the notification system might try to call a method on an unloaded view (or worse an unallocated object), which would be a bad thing!"
You could try something this, it uses a block when it is finished. I had similar thing right here.
// Turn indicator on
// Setup the request
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlString]];
[request setTimeoutInterval: 90.0];
[request setHTTPMethod:#"POST"];
[request setHTTPBody:postData];
request.cachePolicy = NSURLRequestReturnCacheDataElseLoad;
[NSURLConnection sendAsynchronousRequest:request
queue:[NSOperationQueue currentQueue]
completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
// Its has finished but sort out the result (test for data and HTTP 200 i.e. not 404)
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
if (data != nil && error == nil && [httpResponse statusCode] == 200)
{
// Connection finished a gooden
// Do whatever you like with data
// Stop indicator
}
else
{
// There was an error, alert the user
// Do whatever you like with data
// Stop indicator
}
}];