我正在使用AFURLSessionManager创建新的下载任务:
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];
文件下载得很好,但是,如何获取进度通知?
p
始终设为nil。我为此提交了issue。
我还尝试在管理器上调用setDownloadTaskDidWriteDataBlock
,我确实在那里收到了进度通知,但是在文件下载后我收到了所有这些通知
似乎这个区域在AFNetworking 2.0中仍然有点儿错误
有什么想法吗?
答案 0 :(得分:45)
您应该使用KVO观察fractionCompleted
对象的NSProgress
属性:
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];
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];
}
}
当然,您应该检查keyPath
和/或object
参数,以确定这是否是您要观察的对象/属性。
您还可以使用setDownloadTaskDidWriteDataBlock:
中的AFURLSessionManager
方法(AFHTTPSessionManager
继承)来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);
}];
此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。
答案 1 :(得分:17)
我遇到了类似的问题,并找到了解决方案。
检查以下链接: http://cocoadocs.org/docsets/AFNetworking/2.0.1/Categories/UIProgressView+AFNetworking.html
#import <AFNetworking/UIKit+AFNetworking.h>
并使用UIProgressView可用的其他方法
setProgressWithDownloadProgressOfTask:动画:
我是怎么做到的:
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];
答案 2 :(得分:0)
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
})
现在您有两个选择:
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
}
最后不要忘记:
sessionDownloadTask.resume()
答案 3 :(得分:0)
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];