NSURLSession methods don't call - ios

Question

I want to download a file from the server by using the NSURLSession instead of NSURLConnection. But when I use it, some of delegate method is not calling and I don't know why.
#import "ViewController.h"
#interface ViewController ()<NSURLSessionDelegate,NSURLSessionDataDelegate,NSURLSessionDownloadDelegate>
#property (strong,nonatomic) NSURLSessionDownloadTask *downloadTask;
#property (strong,nonatomic) NSURLSession *session;
#end
#implementation ViewController
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
NSURLSessionConfiguration *backgroundConfiguration = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:#"com.webcash.TestingNSURLSession"];
self.session = [NSURLSession sessionWithConfiguration:backgroundConfiguration delegate:self delegateQueue:nil];
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)startDownload:(id)sender {
NSURL *downloadRUL = [NSURL URLWithString:#"http://laguboard.com/music/down/33867378/2794942/NTU0NktpZE56eERWZGxVeC9zTS9LVUd1TEhkZTE0cFZuaW1QS1pFMHVhOUNkM2ZoZEE=/(http://mp3xload.wapka.me).mp3"];
self.downloadTask = [self.session downloadTaskWithURL:downloadRUL];
[self.downloadTask resume];
}
- (IBAction)stopDownload:(id)sender {
}
// ====== THIS METHOD IS NOT CALLING
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite{
if (totalBytesExpectedToWrite == NSURLSessionTransferSizeUnknown) {
return;
} else {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
double progress = (double)totalBytesWritten / (double)totalBytesExpectedToWrite;
NSLog(#"Downloading progress : %f",progress);
}];
}
}
// ==============
-(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error {
if (error != nil) {
NSLog(#"Error : %#",[error localizedDescription]);
} else {
NSLog(#"Download finished");
}
}
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location{
NSError *error;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *urls = [fileManager URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask];
NSURL *documentsDirectory = [urls objectAtIndex:0];
NSURL *originalURL = [[downloadTask originalRequest] URL];
NSURL *destinationURL = [documentsDirectory URLByAppendingPathComponent:[originalURL lastPathComponent]];
[fileManager removeItemAtURL:destinationURL error:NULL];
BOOL success = [fileManager copyItemAtURL:location toURL:destinationURL error:&error];
if (success) {
NSLog(#"Download finished");
} else {
NSLog(#"Error : %#",error.description);
}
}
#end
I follow up with many tutorial but it's still not working. please help me to fix this out. thank you.!

Answer 1

#import "ViewController.h"
#interface ViewController ()<NSURLSessionDelegate, NSURLSessionTaskDelegate>
#property (nonatomic, strong) NSMutableData *activeDownload;
#property (nonatomic, strong) NSURLSessionTask *downloadTask;
#property (nonatomic, assign) NSInteger downloadSize;
#property (nonatomic, assign) NSInteger downloadedSize;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)startDownload:(id)sender {
self.downloadedSize = 0;
NSURL *nsurl = [NSURL URLWithString:#"http://laguboard.com/music/down/33867378/2794942/NTU0NktpZE56eERWZGxVeC9zTS9LVUd1TEhkZTE0cFZuaW1QS1pFMHVhOUNkM2ZoZEE=/(http://mp3xload.wapka.me).mp3"];
NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *downloadSession = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:nil];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:nsurl];
self.downloadTask = [downloadSession dataTaskWithRequest:request];
[self.downloadTask resume];
[downloadSession finishTasksAndInvalidate];
}
- (IBAction)stopDownload:(id)sender {
[self.downloadTask cancel];
self.downloadTask = nil;
self.activeDownload = nil;
}
#pragma mark - NSURLSessionDataDelegate methods
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler
{
completionHandler(NSURLSessionResponseAllow);
self.activeDownload = [[NSMutableData alloc] init];
NSString *contentLength = [[(NSHTTPURLResponse *)response allHeaderFields] valueForKey:#"Content-Length"];
self.downloadSize = contentLength.integerValue;
}
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data
{
[self.activeDownload appendData:data];
self.downloadedSize += [data length];
float downloadProgress = ((float) self.downloadedSize / (float) self.downloadSize) * 100;
//percentage of downloading progress
}
#pragma mark - NSURLSessionTaskDelegate methods
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error
{
if (error != nil) {
NSLog(#"Error : %#",[error localizedDescription]);
} else {
NSLog(#"Download finished");
//the data is in self.activeDownload
}
self.activeDownload = nil;
self.downloadTask = nil;
}
#end