How to monitor pdf download process in iphone sdk - iphone

Question

In my application i need to download pdf file from url.i know how to download pdf file from url and store in local document directory.But i need to show downloading process and i want to know whether download is completed.Please any body give an idea..
Here My code:
NSData *pdfData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:#"http://www.msy.com.au/Parts/PARTS.pdf"]];
//Store the Data locally as PDF File
NSString *resourceDocPath = [[NSString alloc] initWithString:[[[[NSBundle mainBundle] resourcePath] stringByDeletingLastPathComponent] stringByAppendingPathComponent:#"Documents"]];
NSString *filePath = [resourceDocPath stringByAppendingPathComponent:#"myPDF.pdf"];
[pdfData writeToFile:filePath atomically:YES];

Answer 1

Use ASIHTTPRequest for download file. for below code I had used ASIHTTPRequest
float currentProgress;
UILabel *dwnLbl;
UIProgressView * myProgressIndicator;
UIProgressView *progressBar;
#property (nonatomic, retain) ASIHTTPRequest *rqstForAudio;
-(void)viewDidLoad{
self.av=[[UIAlertView alloc] initWithTitle:#"Downloading.." message:nil delegate:self cancelButtonTitle:nil otherButtonTitles:nil];
[self.actV setFrame:CGRectMake(125, 60, 37, 37)];
dwnLbl = [[UILabel alloc] initWithFrame:CGRectMake(45, 30, 200, 37)];
dwnLbl.textAlignment = UITextAlignmentCenter;
dwnLbl.font = [UIFont boldSystemFontOfSize:20];
dwnLbl.backgroundColor = [UIColor clearColor];
dwnLbl.textColor = [UIColor whiteColor];
progressBar = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleBar];
[progressBar setFrame:CGRectMake(45, 65, 200, 20)];
progressBar.progress = 0;
[self.av addSubview:dwnLbl];
[self.av addSubview:progressBar];
}
-(void)downLoadBook{
NSString *strAudioURL=#"http://www.msy.com.au/Parts/PARTS.pdf"
// check first locally exists or not
NSString *strPathToAudioCache=[NSString stringWithFormat:#"%#/%#",
[(NSArray*)NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0],
AudioFolder];
NSDictionary *dOfAudios=[NSDictionary dictionaryWithContentsOfFile:strPathToAudioCache];
if([dOfAudios valueForKey:strAudioURL]) {
} else {
self.av.title = #"Downloading..";
[self.av show];
NSString *pdf = #"bookTitle.pdf";
NSURL *audioURL = [NSURL URLWithString:strAudioURL];
NSString *strPathToDownload=[NSString stringWithFormat:#"%#/%#",[(NSArray*)NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0],pdf];
[self.rqstForAudio setDownloadProgressDelegate:myProgressIndicator];
if(!self.rqstForAudio || [self.rqstForAudio isFinished]) {
self.rqstForAudio=[ASIHTTPRequest requestWithURL:audioURL];
[self.rqstForAudio setDelegate:self];
[self.rqstForAudio setDownloadProgressDelegate:self];
[self.rqstForAudio setAllowResumeForFileDownloads:YES];
[self.rqstForAudio setCachePolicy:ASIUseDefaultCachePolicy];
[self.rqstForAudio setCacheStoragePolicy:ASICachePermanentlyCacheStoragePolicy];
[self.rqstForAudio setDidFailSelector:#selector(failedToLoad:)];
[self.rqstForAudio setDidFinishSelector:#selector(finishedLoading:)];
[self.rqstForAudio setDownloadCache:[ASIDownloadCache sharedCache]];
[self.rqstForAudio setDownloadDestinationPath:strPathToDownload];
[self.rqstForAudio startAsynchronous];
}
}
}
- (void)failedToLoad:(ASIHTTPRequest*)request {
[self.av dismissWithClickedButtonIndex:0 animated:YES];
NSLog(#"failed to download");
UIAlertView *av = [[UIAlertView alloc] initWithTitle:#"MESSAGE" message:#"Failed to Download" delegate:self cancelButtonTitle:RETRY otherButtonTitles:nil, nil];
av.delegate = self;
[av show];
}
- (void)finishedLoading:(ASIHTTPRequest*)request {
NSLog(#"finished loading");
NSString *strPathToAudioCache=[NSString stringWithFormat:#"%#",
[(NSArray*)NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]];
NSMutableDictionary *dOfAudios=[NSMutableDictionary dictionaryWithContentsOfFile:strPathToAudioCache];
if([dOfAudios allKeys].count>0) {
[dOfAudios setValue:[request downloadDestinationPath] forKey:[[request url] description]];
} else {
dOfAudios=[NSMutableDictionary dictionary];
[dOfAudios setValue:[request downloadDestinationPath] forKey:[[request url] description]];
}
[self.av dismissWithClickedButtonIndex:0 animated:YES];
[dOfAudios writeToFile:strPathToAudioCache atomically:YES];
}
- (void)request:(ASIHTTPRequest *)request didReceiveBytes:(long long)bytes{
[self setProgress:[myProgressIndicator progress]];
}
- (void)setProgress:(float)progress
{
currentProgress = progress;
if (!progress == 0.0) {
}
if(currentProgress*100 == 100.00){
self.av.title = #"Finishing..";
}
progressBar.progress = currentProgress;
dwnLbl.text = [NSString stringWithFormat:#"%.2f%%",currentProgress*100];
}
EDIT
You can used the NSURLSession method to implement such scenario
NSURLSession

Answer 2

I'd highly recommend taking a look at ASIHTTPRequest for easy file downloading.
where the numbers of the functionality thru you can able to use the download progress.