NSURLConnection deprecated in iOS9

Question

I want to download a file with a NSURLRequest and save it but in the line with the

NSData * data = ... happens an error.

NSURL *Urlstring = [NSURL URLWithString:@"http://yourdomain.com/yourfile.pdf"];
NSURLRequest *request = [NSURLRequest requestWithURL: Urlstring];
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

NSURL *documentsURL = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
documentsURL = [documentsURL URLByAppendingPathComponent:@"localFile.pdf"];

[data writeToURL:documentsURL atomically:YES];

The warning Message is that i should use NSURLSession dataTaskwithrequest"because sendSynchronousRequest is deprecated in iOS 9 but that doesn't work I hope someone can help me

"Deprecated" isn't an error. It's a warning that something is going away in the future. If you have an actual error, it's probably for a different reason. — Phillip Mills, Sep 07 '15 at 14:44

score 34 · Accepted Answer · edited Nov 27 '15 at 12:52

Now you have to use NSURLSession

Example (GET):

-(void)placeGetRequest:(NSString *)action withHandler:(void (^)(NSData *data, NSURLResponse *response, NSError *error))ourBlock {

    NSString *urlString = [NSString stringWithFormat:@"%@/%@", URL_API, action];


    NSURL *url = [NSURL URLWithString:urlString];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    [[[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:ourBlock] resume];
}

Now you will need to call that method with an action (or your full URL if you prefer) and the block that will be executed when the API call return.

[self placeGetRequest:@"action" withHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    // your code
}];

Inside that block, you will received a NSData with the response data and NSURLResponse with the HTTP response. So now, you can put your code there:

NSURL *documentsURL = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
documentsURL = [documentsURL URLByAppendingPathComponent:@"localFile.pdf"];

[data writeToURL:documentsURL atomically:YES];

Main difference between NSURLSession and NSURLConnection

NSURLConnection: if we have an open connection with NSURLConnection and the system interrupt our App, when our App goes to background mode, everything we have received or sent were lost.
NSURLSession: solve this problem and also give us out of process downloads. It manage the connection process even when we don't have access. You will need to use application:handleEventsForBackgroundURLSession:completionHandler in your AppDelegate

So with the use of NSURLSession, you don't need to manage or to check your internet connection because OS does it for you.

Ok Thank you but what is ourBlock it says undeclared identifier — Maximilian, Sep 07 '15 at 14:50
Oh yes! ourBlock is a block that you have to define. It should include the source code that you want to execute when the api call finished. I will edit my answer to give you the full example — EnriMR, Sep 07 '15 at 14:51
@Maximilian, check now my updated answer and test it inside your project — EnriMR, Sep 07 '15 at 14:59
@EnriMR, looks like `dataTaskWithRequest` lacks `resume`, no? `[[[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:ourBlock] resume];` — Eugene Braginets, Sep 29 '15 at 10:05
Yes, resume is missing. It seems the execution never goes to ourBlock without it. — diidu, Nov 27 '15 at 11:40

NSURLConnection deprecated in iOS9

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