iOS利用AFNetworking实现文件上传的示例代码

下面是iOS利用AFNetworking实现文件上传的完整攻略：

1. 准备工作

首先需要将AFNetworking库添加到项目中。可以通过CocoaPods来管理库的依赖，在Podfile文件中添加以下代码：

platform :iOS, '8.0'
pod 'AFNetworking', '~> 3.0'

执行pod install命令后，就可以引用AFNetworking库了。

2. 实现上传文件功能

以下是使用AFNetworking实现文件上传的示例代码：

AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:@"http://example.com/upload" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
    [formData appendPartWithFileData:imageData name:@"file" fileName:@"file.png" mimeType:@"image/png"];
} error:nil];

NSURLSessionUploadTask *uploadTask;
uploadTask = [manager
    uploadTaskWithStreamedRequest:request
    progress:^(NSProgress * _Nonnull uploadProgress) {
        // This is not called back on the main queue.
        // You are responsible for dispatching to the main queue for UI updates
        dispatch_async(dispatch_get_main_queue(), ^{
            //Update the progress view
            [progressView setProgress:uploadProgress.fractionCompleted];
        });
    }
    completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
        if (error) {
            NSLog(@"Error: %@", error);
        } else {
            NSLog(@"%@ %@", response, responseObject);
        }
    }];

[uploadTask resume];

上述代码中，AFURLSessionManager用于管理NSURLSession对象，AFHTTPRequestSerializer用于创建包含上传文件数据的HTTP请求对象。在参数constructingBodyWithBlock中，使用appendPartWithFileData:name:fileName:mimeType:方法添加上传文件的数据。NSURLSessionUploadTask用于执行上传任务，通过调用uploadTaskWithStreamedRequest:progress:completionHandler:方法来设置上传任务的参数，其中progress参数用于更新UI进度条，completionHandler参数用于处理上传结果。

3. 示例说明

下面以上传图片和上传音频文件为例，说明如何实现上传功能。

示例1：上传图片

以下是上传图片的示例代码，其中imageData为准备好的图片数据：

AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:@"http://example.com/upload" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
    [formData appendPartWithFileData:imageData name:@"file" fileName:@"image.png" mimeType:@"image/png"];
} error:nil];

NSURLSessionUploadTask *uploadTask;
uploadTask = [manager
    uploadTaskWithStreamedRequest:request
    progress:^(NSProgress * _Nonnull uploadProgress) {
        dispatch_async(dispatch_get_main_queue(), ^{
            [progressView setProgress:uploadProgress.fractionCompleted];
        });
    }
    completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
        if (error) {
            NSLog(@"Error: %@", error);
        } else {
            NSLog(@"%@ %@", response, responseObject);
        }
    }];

[uploadTask resume];

示例2：上传音频文件

以下是上传音频文件的示例代码，其中audioData为准备好的音频数据：

AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:@"http://example.com/upload" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
    [formData appendPartWithFileData:audioData name:@"file" fileName:@"audio.m4a" mimeType:@"audio/m4a"];
} error:nil];

NSURLSessionUploadTask *uploadTask;
uploadTask = [manager
    uploadTaskWithStreamedRequest:request
    progress:^(NSProgress * _Nonnull uploadProgress) {
        dispatch_async(dispatch_get_main_queue(), ^{
            [progressView setProgress:uploadProgress.fractionCompleted];
        });
    }
    completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
        if (error) {
            NSLog(@"Error: %@", error);
        } else {
            NSLog(@"%@ %@", response, responseObject);
        }
    }];

[uploadTask resume];

以上就是关于iOS利用AFNetworking实现文件上传的完整攻略，希望能对你有所帮助。