如何从resumeData的NSURLSessionResumeCurrentRequest中为HTTPHeaderField添加值？答案

【问题标题】：How to addValue forHTTPHeaderField from NSURLSessionResumeCurrentRequest of resumeData?如何从resumeData的NSURLSessionResumeCurrentRequest中为HTTPHeaderField添加值？
【发布时间】：2014-11-12 00:12:34
【问题描述】：

我有一个来自 cancelByProducingResumeData 的 resumeData 的字典：如下所示，我想知道如何使用 NSURLSessionResumeCurrentRequest 为 HTTPHeaderField 添加Value。

我想知道如何将 NSURLSessionResumeCurrentRequest 的 NSData 转换为 NSURLRequest。

2014-11-11 13:11:30.545 xxxxXXXXXX[77997:14163248] resumeInfo => { NSURLSessionDownloadURL = "http://xxx.xxx.xxx/webdav/content/admin/201407/ttp.mp4"; NSURLSessionResumeBytesReceived = 50737920; NSURLSessionResumeCurrentRequest = ; NSURLSessionResumeEntityTag = 41220469dd0d761e33125751d386d9b1; NSURLSessionResumeInfoLocalPath = "/Users/Library/Developer/CoreSimulator/Devices/0F13C2EC-4B9C-4FB4-AD78-7A309C4C65F2/data/Containers/Data/Application/28925A91-9DDE-4041-A1F5-A35387E9115E/tmp/CFNetworkDownload_NKJuq1.tmp"; NSURLSessionResumeInfoVersion = 1; NSURLSessionResumeOriginalRequest = ; NSURLSessionResumeServerDownloadDate = "2014 年 7 月 25 日星期五 04:36:22 GMT";

【问题讨论】：

标签： ios nsurlrequest nsurlsession nsurlsessiondownloadtask header-fields

【解决方案1】：

我尝试使用以下代码更改我的请求，非常成功！ ;)

- (NSData *)regenerateResumeData:(NSData *)originData
{
    NSString *error;
    NSPropertyListFormat format;
    NSMutableDictionary* plist = [NSMutableDictionary dictionaryWithDictionary:[NSPropertyListSerialization propertyListFromData:originData mutabilityOption:NSPropertyListImmutable format:&format errorDescription:&error]];

    NSData *currentRequest = [plist objectForKey:@"NSURLSessionResumeCurrentRequest"]; 
    NSURLRequest *request = [(NSURLRequest *)[NSKeyedUnarchiver unarchiveObjectWithData:currentRequest] copy];
    NSMutableURLRequest *mutableRequest = [request mutableCopy];
    [mutableRequest addValue:[plist objectForKey:@"NSURLSessionResumeEntityTag"] forHTTPHeaderField:@"If-Match"];
    [mutableRequest addValue:[NSString stringWithFormat:@"bytes=%@-", [plist objectForKey:@"NSURLSessionResumeBytesReceived"]] forHTTPHeaderField:@"Range"];
    request = [mutableRequest copy];

    NSData *archivedData = [NSKeyedArchiver archivedDataWithRootObject:request];

    [plist removeObjectForKey:@"NSURLSessionResumeCurrentRequest"];
    [plist setValue:archivedData forKey:@"NSURLSessionResumeCurrentRequest"];

    return [NSPropertyListSerialization dataFromPropertyList:plist format:NSPropertyListBinaryFormat_v1_0 errorDescription:&error];
}

【讨论】：