ios 如何在 AFNetworking 2.0 中获取下载进度？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/19145093/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to get download progress in AFNetworking 2.0?
提问by gregschlom
I am using AFURLSessionManager to create a new download task:
我正在使用 AFURLSessionManager 创建一个新的下载任务：
AFURLSessionManager* manager = ...
NSProgress* p = nil;
NSURLSessionDownloadTask* downloadTask =
[manager downloadTaskWithRequest:request
progress:&p
destination:^NSURL*(NSURL* targetPath, NSURLResponse* response) {...}
completionHandler:^(NSURLResponse* response, NSURL* filePath, NSError* error) {...}
];
[downloadTask resume];
The file gets downloaded fine, however, how do I get progress notifications?
该文件可以正常下载，但是，我如何获得进度通知？
pis always set to nil. I've filed an issuefor that.
p始终设置为零。我已经为此提出了一个问题。
I've also tried to call setDownloadTaskDidWriteDataBlockon the manager, and I do get progress notifications there but I receive them all grouped together afterthe file has been downloaded.
我也试过打电话setDownloadTaskDidWriteDataBlock给经理，我确实在那里收到了进度通知，但在下载文件后我将它们全部组合在一起。
Seems like this area is still a bit buggy in AFNetworking 2.0
似乎这个区域在 AFNetworking 2.0 中仍然有点问题
Any ideas?
有任何想法吗？
回答by Sendoa
You should observe the fractionCompletedproperty of your NSProgressobject using KVO:
您应该使用 KVO观察对象的fractionCompleted属性NSProgress：
NSURL *url = [NSURL URLWithString:@"http://www.hfrmovies.com/TheHobbitDesolationOfSmaug48fps.mp4"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
AFHTTPSessionManager *session = [AFHTTPSessionManager manager];
NSProgress *progress;
NSURLSessionDownloadTask *downloadTask = [session downloadTaskWithRequest:request progress:&progress destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
// …
} completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
[progress removeObserver:self forKeyPath:@"fractionCompleted" context:NULL];
// …
}];
[downloadTask resume];
[progress addObserver:self
forKeyPath:@"fractionCompleted"
options:NSKeyValueObservingOptionNew
context:NULL];
Then add the observer method:
然后添加观察者方法：
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
if ([keyPath isEqualToString:@"fractionCompleted"]) {
NSProgress *progress = (NSProgress *)object;
NSLog(@"Progress… %f", progress.fractionCompleted);
} else {
[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
}
}
Of course, you should check keyPathand/or objectparameters to decide if that's the object/property you want to observe.
当然，您应该检查keyPath和/或object参数来决定这是否是您要观察的对象/属性。
You can also use the setDownloadTaskDidWriteDataBlock:method from AFURLSessionManager(from which AFHTTPSessionManagerinherits) to set a block for receiving download progress updates.
您还可以使用setDownloadTaskDidWriteDataBlock:from AFURLSessionManager(from which AFHTTPSessionManagerinherits) 方法设置接收下载进度更新的块。
[session setDownloadTaskDidWriteDataBlock:^(NSURLSession *session, NSURLSessionDownloadTask *downloadTask, int64_t bytesWritten, int64_t totalBytesWritten, int64_t totalBytesExpectedToWrite) {
NSLog(@"Progress… %lld", totalBytesWritten);
}];
This AFNetworking method maps the URLSession:downloadTask:didWriteData:totalBytesWritten:totalBytesExpectedToWrite:method from NSURLSessionDownloadDelegateprotocol to a more convenient block mechanism.
这种 AFNetworking 方法将URLSession:downloadTask:didWriteData:totalBytesWritten:totalBytesExpectedToWrite:方法从NSURLSessionDownloadDelegate协议映射到更方便的块机制。
BTW, Apple's KVO implementation is severely broken. I recommend using a better implementation like the one proposed by Mike Ash with MAKVONotificationCenter. If you are interested in reading why Apple's KVO is broken, read Key-Value Observing Done Rightby Mike Ash.
顺便说一句，Apple 的 KVO 实现被严重破坏。我建议使用更好的实现，例如 Mike Ash 与MAKVONotificationCenter提出的实现。如果您有兴趣阅读 Apple 的 KVO 被破坏的原因，请阅读Mike Ash 的Key-Value Observing Done Right。
回答by CKD
I faced a similar problem, and found a solution.
我遇到了类似的问题，并找到了解决方案。
Check the link below: http://cocoadocs.org/docsets/AFNetworking/2.0.1/Categories/UIProgressView+AFNetworking.html
检查以下链接：http: //cocoadocs.org/docsets/AFNetworking/2.0.1/Categories/UIProgressView+AFNetworking.html
#import <AFNetworking/UIKit+AFNetworking.h>
and use the additional method available to your UIProgressView
并使用可用于 UIProgressView 的其他方法
setProgressWithDownloadProgressOfTask:animated:
setProgressWithDownloadProgressOfTask: 动画:
How I did it:
我是如何做到的：
NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response){
NSURL *documentsDirectoryPath = [NSURL fileURLWithPath:[NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES) firstObject]];
return [documentsDirectoryPath URLByAppendingPathComponent:[targetPath lastPathComponent]];
} completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error){
NSLog(@"File downloaded to: %@", filePath);
}];
[self.progressView setProgressWithDownloadProgressOfTask:downloadTask animated:YES];
[downloadTask resume];
回答by Bart?omiej Semańczyk
Simple solutions for Swift:
Swift 的简单解决方案：
let sessionConfiguration = NSURLSessionConfiguration.defaultSessionConfiguration()
let sessionManager = AFURLSessionManager(sessionConfiguration: sessionConfiguration)
let request = NSURLRequest(URL: url)
let sessionDownloadTask = sessionManager.downloadTaskWithRequest(request, progress: nil, destination: { (url, response) -> NSURL in
return destinationPath.URLByAppendingPathComponent(fileName) //this is destinationPath for downloaded file
}, completionHandler: { response, url, error in
//do sth when it finishes
})
Now you have 2 options:
现在您有 2 个选择：
Using
UIProgressViewandsetProgressWithDownloadProgressOfTask:progressView.setProgressWithDownloadProgressOfTask(sessionDownloadTask, animated: true)Using
AFURLSessionManagerandsetDownloadTaskDidWriteDataBlock:sessionManager.setDownloadTaskDidWriteDataBlock { session, sessionDownloadTask, bytesWritten, totalBytesWritten, totalBytesExpectedToWrite in let progress = Float(totalBytesWritten)/Float(totalBytesExpectedToWrite) //do sth with current progress }
使用
UIProgressView和setProgressWithDownloadProgressOfTask:progressView.setProgressWithDownloadProgressOfTask(sessionDownloadTask, animated: true)使用
AFURLSessionManager和setDownloadTaskDidWriteDataBlock:sessionManager.setDownloadTaskDidWriteDataBlock { session, sessionDownloadTask, bytesWritten, totalBytesWritten, totalBytesExpectedToWrite in let progress = Float(totalBytesWritten)/Float(totalBytesExpectedToWrite) //do sth with current progress }
At the end do not forget about:
最后不要忘记：
sessionDownloadTask.resume()
回答by DURGESH
For Download file with progress status use this code
对于具有进度状态的下载文件，请使用此代码
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];
NSURL *URL = [NSURL URLWithString:@"http://..."];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];
NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress)
{
NSLog(@"Progress: %f", downloadProgress.fractionCompleted);
if (progressBlock) {
progressBlock(downloadProgress);
}
} 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)
{
if (response && successBlock) {
successBlock(response,filePath);
}
NSLog(@"File downloaded to: %@", filePath);
}];
[downloadTask resume];
