iOS 开发-AFNetworking Block下载文件保存到沙盒_ios afnetwork 下载文件到沙盒-优快云博客

本文链接：https://blog.youkuaiyun.com/sinat_28709097/article/details/54948462

本文介绍如何使用AFNetworking 2.x及3.x版本实现文件下载功能，包括设置请求参数、跟踪下载进度、处理下载完成和失败的情况。

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AFNetworking 2.X

 *  @author Jakey
 *
 *  @brief  下载文件
 *
 *  @param parameters   附加post参数
 *  @param requestURL 请求地址
 *  @param savedPath  保存 在磁盘的位置
 *  @param success    下载成功回调
 *  @param failure    下载失败回调
 *  @param progress   实时下载进度回调
 */
- (void)downloadFileWithOption:(NSDictionary *)parameters
                 withInferface:(NSString*)requestURL
                     savedPath:(NSString*)savedPath
               downloadSuccess:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
               downloadFailure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
                      progress:(void (^)(float progress))progress

{

    //沙盒路径    //NSString *savedPath = [NSHomeDirectory() stringByAppendingString:@"/Documents/xxx.zip"];
    AFHTTPRequestSerializer *serializer = [AFHTTPRequestSerializer serializer];
    NSMutableURLRequest *request =[serializer requestWithMethod:@"POST" URLString:requestURL parameters:parameters error:nil];

//以下是手动创建request方法 AFQueryStringFromParametersWithEncoding有时候会保存
//    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:requestURL]];
//   NSMutableURLRequest *request =[[[AFHTTPRequestOperationManager manager]requestSerializer]requestWithMethod:@"POST" URLString:requestURL parameters:paramaterDic error:nil];
//
//    NSString *charset = (__bridge NSString *)CFStringConvertEncodingToIANACharSetName(CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding));
//    
//    [request setValue:[NSString stringWithFormat:@"application/x-www-form-urlencoded; charset=%@", charset] forHTTPHeaderField:@"Content-Type"];
//    [request setHTTPMethod:@"POST"];
//
//    [request setHTTPBody:[AFQueryStringFromParametersWithEncoding(paramaterDic, NSASCIIStringEncoding) dataUsingEncoding:NSUTF8StringEncoding]];

    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc]initWithRequest:request];
    [operation setOutputStream:[NSOutputStream outputStreamToFileAtPath:savedPath append:NO]];
    [operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {
        float p = (float)totalBytesRead / totalBytesExpectedToRead;
        progress(p);
        NSLog(@"download：%f", (float)totalBytesRead / totalBytesExpectedToRead);

    }];

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        success(operation,responseObject);
        NSLog(@"下载成功");

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        success(operation,error);

        NSLog(@"下载失败");

    }];

    [operation start];

}


//使用
- (IBAction)downloadTouched:(id)sender {
    NSString *savedPath = [NSHomeDirectory() stringByAppendingString:@"/Documents/QQ7.6.exe"];
    //    NSDictionary *paramaterDic= @{@"jsonString":[@{@"userid":@"2332"} JSONString]?:@""};
    [self downloadFileWithOption:@{@"userid":@"123123"}
                   withInferface:@"http://dldir1.qq.com/qqfile/qq/QQ7.6/15742/QQ7.6.exe"
                       savedPath:savedPath
                 downloadSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

    } downloadFailure:^(AFHTTPRequestOperation *operation, NSError *error) {

    } progress:^(float progress) {

    }];
}

AFNetworking 3.X

- (void)downloadFileWithURL:(NSString*)requestURLString
                 parameters:(NSDictionary *)parameters
                  savedPath:(NSString*)savedPath
            downloadSuccess:(void (^)(NSURLResponse *response, NSURL *filePath))success
            downloadFailure:(void (^)(NSError *error))failure
           downloadProgress:(void (^)(NSProgress *downloadProgress))progress

{

    AFHTTPRequestSerializer *serializer = [AFHTTPRequestSerializer serializer];
    NSMutableURLRequest *request =[serializer requestWithMethod:@"POST" URLString:requestURLString parameters:parameters error:nil];
    NSURLSessionDownloadTask *task = [[AFHTTPSessionManager manager] downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress) {
        progress(downloadProgress);
    } destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
        return [NSURL fileURLWithPath:savedPath];
    } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
        if(error){
            failure(error);
        }else{
            success(response,filePath);
        }
    }];
    [task resume];

}

调用

- (IBAction)downloadTouched:(id)sender {
    NSString *savedPath = [NSHomeDirectory() stringByAppendingString:@"/Documents/QQ7.6.exe"];
   [self downloadFileWithURL:@"http://dldir1.qq.com/qqfile/qq/QQ7.6/15742/QQ7.6.exe" parameters:@{@"userid":@"123123"} savedPath:savedPath downloadSuccess:^(NSURLResponse *response, NSURL *filePath) {

   } downloadFailure:^(NSError *error) {

   } downloadProgress:^(NSProgress *downloadProgress) {
      NSLog(@"总大小：%lld,当前大小:%lld",downloadProgress.totalUnitCount,downloadProgress.completedUnitCount);
   }];
}

问题
有些人的AFNetworking 3 progress参数是一个指针，并不是一个block，如下：

- (void)addDelegateForDownloadTask:(NSURLSessionDownloadTask *)downloadTask
                          progress:(NSProgress * __autoreleasing *)progress
                        destination:(NSURL * (^)(NSURL *targetPath, NSURLResponse *response))destination
                  completionHandler:(void (^)(NSURLResponse *response, NSURL *filePath, NSError *error))completionHandler

可以自行更新到最新版本的AFN或者使用KVO监听progress,progress是一个NSProgress实例

NSProgress *progress;
[manager downloadTaskWithRequest:request progress:&progress destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {...

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

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context{
    if ([keyPath isEqualToString:@"fractionCompleted"] && [object isKindOfClass:[NSProgress class]]) {
        NSProgress *progress = (NSProgress *)object;
       NSLog(@"总大小：%lld,当前大小:%lld",progress.totalUnitCount,progress.completedUnitCount);
    }
}