Ios 使用AFNetworking 2.0上载进度

我知道这个问题在这个网站上非常流行，但是在搜索了大部分答案后，我找不到解决方案。 我的应用程序是将图像上传到远程url。我尝试了几种上传方式，都成功了：
（1） 使用AFURLSessionManager

AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
[(AFHTTPResponseSerializer*)manager.responseSerializer setAcceptableContentTypes:[NSSet setWithObjects:@"multipart/form-data", nil]];
NSURLSessionUploadTask *uploadTask = [manager uploadTaskWithStreamedRequest:request progress:&progress completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) {
    if (error) {
        NSDictionary *userInfo=[error userInfo];
        id responseError=[userInfo objectForKey:@"AFNetworkingOperationFailingURLResponseErrorKey"];
        if ([responseError isKindOfClass:[NSHTTPURLResponse class]]) {
            NSHTTPURLResponse *reponse=(NSHTTPURLResponse*)responseError;
            if (reponse.statusCode==200) {
                result(YES);
            } else {
                result(NO);
            }
        } else {
            result(NO);
        }
    } else {
        result(YES);
    }
}];
[uploadTask resume];

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    manager.requestSerializer = [AFHTTPRequestSerializer serializer];
    manager.responseSerializer = [AFHTTPResponseSerializer serializer];
    AFHTTPRequestOperation *operation =
    [manager HTTPRequestOperationWithRequest:request
                                     success:^(AFHTTPRequestOperation *operation, id responseObject) {
                                         NSLog(@"Success %@", responseObject);
                                         result(YES);
                                     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                                         if (operation.response.statusCode==200) {
                                             result(YES);


              } else {
                                         result(NO);
                                     }
                                 }];

// 4. Set the progress block of the operation.
[operation setUploadProgressBlock:^(NSUInteger __unused bytesWritten,
                                    long long totalBytesWritten,
                                    long long totalBytesExpectedToWrite) {
    double percentDone = (double)totalBytesWritten / (double)totalBytesExpectedToWrite;
    NSLog(@"progress updated(percentDone) : %f", percentDone);
}];

// 5. Begin!
[operation start];

对于这种方式，我使用KVO来监控进度，但没有运气

（2） 使用AFHTTPRequestOperation

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
    [operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
        NSLog(@"total bytes written: %lld",totalBytesWritten);
    }];
    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        result(YES);
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        if (operation.response.statusCode==200) {
            result(YES);
        } else {
            result(NO);
        }
    }];
    [operation start];

它仅显示日志“total bytes Writed:”仅一次，在开始上载时立即显示文件的100%卷

（3） 使用AFHTTPRequestOperationManager

AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
[(AFHTTPResponseSerializer*)manager.responseSerializer setAcceptableContentTypes:[NSSet setWithObjects:@"multipart/form-data", nil]];
NSURLSessionUploadTask *uploadTask = [manager uploadTaskWithStreamedRequest:request progress:&progress completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) {
    if (error) {
        NSDictionary *userInfo=[error userInfo];
        id responseError=[userInfo objectForKey:@"AFNetworkingOperationFailingURLResponseErrorKey"];
        if ([responseError isKindOfClass:[NSHTTPURLResponse class]]) {
            NSHTTPURLResponse *reponse=(NSHTTPURLResponse*)responseError;
            if (reponse.statusCode==200) {
                result(YES);
            } else {
                result(NO);
            }
        } else {
            result(NO);
        }
    } else {
        result(YES);
    }
}];
[uploadTask resume];

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    manager.requestSerializer = [AFHTTPRequestSerializer serializer];
    manager.responseSerializer = [AFHTTPResponseSerializer serializer];
    AFHTTPRequestOperation *operation =
    [manager HTTPRequestOperationWithRequest:request
                                     success:^(AFHTTPRequestOperation *operation, id responseObject) {
                                         NSLog(@"Success %@", responseObject);
                                         result(YES);
                                     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                                         if (operation.response.statusCode==200) {
                                             result(YES);


              } else {
                                         result(NO);
                                     }
                                 }];

// 4. Set the progress block of the operation.
[operation setUploadProgressBlock:^(NSUInteger __unused bytesWritten,
                                    long long totalBytesWritten,
                                    long long totalBytesExpectedToWrite) {
    double percentDone = (double)totalBytesWritten / (double)totalBytesExpectedToWrite;
    NSLog(@"progress updated(percentDone) : %f", percentDone);
}];

// 5. Begin!
[operation start];

=>第二个解决方案的结果相同

---

请注意，所有解决方案均已成功上载，但进度未更新（

NSProgress

或block）。

在NSProgress上设置观察者

差不多

[uploadTask resume];
[progress addObserver:self
                   forKeyPath:@"fractionCompleted"
                      options:NSKeyValueObservingOptionNew
                      context:NULL];

然后实施

- (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];
    }
}

上传任务完成后，别忘了删除观察者

---

注意：progress.fractionCompleted返回一个百分比值。最后，我找到了进度块没有被调用的原因：我上传了一个大约几十Kb的非常小的图像。我尝试上传更大的文件，进程块被调用。根据我的经验，KVO和NSProgress不起作用。相反，我们可以使用AFHTTPRequestOperation或AFHTTPRequestOperationManager。如果您喜欢手动上传，您可以按照建议使用NSURLConnection和委派方法：

-（void）连接：（NSURLConnection*）连接
didSendBodyData：（NSInteger）字节写入
TotalBytesWrited：（NSInteger）TotalBytesWrited
totalBytesExpectedToWrite：（集成器）totalBytesExpectedToWrite{
NSLog（@“百分比：%d”，100*TotalBytesWrite/totalBytesExpectedToWrite）；
}

than，但我在项目中使用了上述代码（KVO Key-value observer）。我不知道为什么观察员没有开火。我按照u的建议上传了一个更大的文件，代理连接：didSendBodyData被调用，日志也被打印出来。但是1）委托中的self.uploadProgress为零，因此不会调用回调块setUploadProgressBlock。2） AFURLConnectionOperation.m中的调试描述了self.uploadProgressBlock在委托中变为nil时具有内容的self.uploadProgress。