问题
I want to download large file using AFNetworking 3. But I need to resume download while there is any interruption like internet loss or any other things. If any interrupts while downloading I want to start download from where it stop early. Is it possible using AFNetworking or do I use any other libraries? Please anybody help me. Here is my code.
NSURLRequest *request = [NSURLRequest requestWithURL:formattedURL];
//Watch the manager to see how much of the file it's downloaded
[manager setDownloadTaskDidWriteDataBlock:^(NSURLSession *session, NSURLSessionDownloadTask *downloadTask, int64_t bytesWritten, int64_t totalBytesWritten, int64_t totalBytesExpectedToWrite) {
//Convert totalBytesWritten and totalBytesExpectedToWrite into floats so that percentageCompleted doesn't get rounded to the nearest integer
CGFloat written = totalBytesWritten;
CGFloat total = totalBytesExpectedToWrite;
CGFloat percentageCompleted = written/total;
//Return the completed progress so we can display it somewhere else in app
//progressBlock(percentageCompleted);
NSLog(@"Percentage Completed : %f",percentageCompleted);
[self updateProgressBar:percentageCompleted];
}];
NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
//Getting the path of the document directory
NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:nil];
NSURL *fullURL = [documentsDirectoryURL URLByAppendingPathComponent:@"3511_1464694276.zip"];
//If we already have a video file saved, remove it from the phone
return fullURL;
} completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
if (!error) {
//If there's no error, return the completion block
//completionBlock(filePath);
} else {
//Otherwise return the error block
//errorBlock(error);
}
}];
[downloadTask resume];
回答1:
Read more about it here : https://github.com/AFNetworking/AFNetworking
And try to ask questions when you have written some code or tried something on your own.
Download file with progress :
- (IBAction)downloadAudio:(id)sender {
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];
NSURL *URL = [NSURL URLWithString:@"http://101songs.com/fileDownload/Songs/0/26958.mp3"];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];
NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress) {
dispatch_async(dispatch_get_main_queue(), ^{
//Update the progress view
[_myProgressView setProgress:downloadProgress.fractionCompleted];
});
} destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:nil];
return [documentsDirectoryURL URLByAppendingPathComponent:[response suggestedFilename]];
} completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
// Do operation after download is complete
}];
[downloadTask resume];
}
来源：https://stackoverflow.com/questions/37698417/how-do-i-download-large-file-with-streaming-in-afnetworking-3