AFHTTPSessionOperation is a NSOperation subclass for HTTP requests added to AFNetworking's AFHTTPSessionManager. AFURLSessionOperation is a NSOperation subclass for data, upload, and download requests implemented in AFURLSessionManager.
This has been updated for AFNetworking 3.x. See 2.x branch of this repo if you're using AFNetworking 2.x.
When using AFHTTPRequestOperationManager (now retired), you enjoy NSOperation capabilities, but when using AFHTTPSessionManager, you don't. This is somewhat understandable (as NSURLSession introduces background requests, and that's incompatible with NSOperation-based approaches), but when performing requests in the foreground, it's useful to have NSOperation-style capabilities. This class makes that possible.
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
manager.responseSerializer = [AFImageResponseSerializer serializer];
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
queue.maxConcurrentOperationCount = 3;
NSArray *filenames = @[@"file1.jpg", @"file2.jpg", @"file3.jpg", @"file4.jpg", @"file5.jpg", @"file6.jpg"];
for (NSString *filename in filenames) {
NSString *urlString = [@"http://example.com" stringByAppendingPathComponent:filename];
NSOperation *operation = [AFHTTPSessionOperation operationWithManager:manager HTTPMethod:@"GET" URLString:urlString parameters:nil uploadProgress:nil downloadProgress:^(NSProgress *downloadProgress) {
NSLog(@"%@: %.1f", filename, downloadProgress.fractionCompleted * 100.0);
} success:^(NSURLSessionDataTask *task, id responseObject) {
NSLog(@"%@: %@", filename, NSStringFromCGSize([responseObject size]));
} failure:^(NSURLSessionDataTask *task, NSError *error) {
NSLog(@"%@: %@", filename, error.localizedDescription);
}];
[queue addOperation:operation];
}
AFURLSessionManager *manager = [[AFURLSessionManager alloc] init];
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
queue.maxConcurrentOperationCount = 3;
NSArray *filenames = @[@"file1.jpg", @"file2.jpg", @"file3.jpg", @"file4.jpg", @"file5.jpg", @"file6.jpg"];
for (NSString *filename in filenames) {
NSString *urlString = [@"http://example.com" stringByAppendingPathComponent:filename];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]];
NSOperation *operation = [AFURLSessionOperation downloadOperationWithManager:manager request:request progress:^(NSProgress * _Nonnull downloadProgress) {
NSLog(@"%@: %.1f", filename, downloadProgress.fractionCompleted * 100.0);
} destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
NSError *error;
NSURL *documentsURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:false error:&error];
return [documentsURL URLByAppendingPathComponent:filename];
} completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
NSLog(@"%@ done %@", filename, (error.localizedDescription ?: @""));
}];
[queue addOperation:operation];
}
The progress of a series of requests can be accomplished by creating your own NSProgress object and then call addChild for the NSProgress objects of all of the tasks that are created. You can then add an observer to the fractionCompleted of your NSProgress.
To determine when the downloads are done, you can add an operation (e.g. a NSBlockOperation) and then make it dependent upon all of the other operations that were added to the queue.
To illustrate this, a Swift 2 implementation might look like so. The Objective-C implementation is equivalent.
import UIKit
private var observerContext = 0
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
progress = NSProgress()
progress.addObserver(self, forKeyPath: "fractionCompleted", options: .New, context: &observerContext)
downloadFiles()
}
private var progress: NSProgress!
deinit {
progress?.removeObserver(self, forKeyPath: "fractionCompleted")
}
private func downloadFiles() {
let filenames = ["as17-134-20380.jpg", "as17-140-21497.jpg", "as17-148-22727.jpg"]
let baseURL = NSURL(string: "http://example.com/path")!
let queue = NSOperationQueue()
queue.maxConcurrentOperationCount = 4
progress.totalUnitCount = Int64(filenames.count)
progress.completedUnitCount = 0
let manager = AFHTTPSessionManager()
manager.responseSerializer = AFImageResponseSerializer()
let completionOperation = NSBlockOperation {
print("done")
}
for filename in filenames {
let url = baseURL.URLByAppendingPathComponent(filename)
let operation = AFHTTPSessionOperation(manager: manager, HTTPMethod: "GET", URLString: url.absoluteString, parameters: nil, uploadProgress: nil, downloadProgress: nil, success:
{ (task, responseObject) -> Void in
print("\(filename): \(NSStringFromCGSize((responseObject as! UIImage).size))")
}, failure: { task, error in
print("\(filename): \(error)")
})
queue.addOperation(operation)
completionOperation.addDependency(operation)
progress.addChild(manager.downloadProgressForTask(operation.task!)!, withPendingUnitCount: 1)
}
queue.addOperation(completionOperation)
}
override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {
if context == &observerContext {
if keyPath == "fractionCompleted" {
let percent = change![NSKeyValueChangeNewKey] as! Double
print("\(percent)")
}
} else {
super.observeValueForKeyPath(keyPath, ofObject: object, change: change, context: context)
}
}
}
Note, this is a mix and match situation, where you can use either NSProgress or completion handler or both or neither. I just depends upon your needs.
As contemplated in AFNetworking issue #1504.
The MIT License (MIT)
Copyright (c) 2015 Rob Ryan
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