MFQiNiuUtil.m 方法：

+ (NSString *)makeToken:(NSString *)accessKey secretKey:(NSString *)secretKey{
    const char *secretKeyStr = [secretKey UTF8String];
    NSString *policy = [MFQiNiuUtil marshal];
    NSData *policyData = [policy dataUsingEncoding:NSUTF8StringEncoding];
    NSString *encodedPolicy = [QN_GTM_Base64 stringByWebSafeEncodingData:policyData padded:TRUE];
    const char *encodedPolicyStr = [encodedPolicy cStringUsingEncoding:NSUTF8StringEncoding];
    char digestStr[CC_SHA1_DIGEST_LENGTH];
    bzero(digestStr, 0);
    CCHmac(kCCHmacAlgSHA1, secretKeyStr, strlen(secretKeyStr), encodedPolicyStr, strlen(encodedPolicyStr), digestStr);
    NSString *encodedDigest = [QN_GTM_Base64 stringByWebSafeEncodingBytes:digestStr length:CC_SHA1_DIGEST_LENGTH padded:TRUE];
    NSString *token = [NSString stringWithFormat:@"%@:%@:%@",  accessKey, encodedDigest, encodedPolicy];
    return token;//得到了token
}

+ (NSString *)marshal{
    NSInteger _expire = 0;
    time_t deadline;
    time(&deadline);//返回当前系统时间
    //@property (nonatomic , assign) int expires; 怎么定义随你...
    deadline += (_expire > 0) ? _expire : 3600; // +3600秒,即默认token保存1小时.
    NSNumber *deadlineNumber = [NSNumber numberWithLongLong:deadline];
    NSMutableDictionary *dic = [NSMutableDictionary dictionary];
    // 修改成七牛存储空间的名字
    [dic setObject:kQiNiuBucketName forKey:@"scope"];//根据
    [dic setObject:deadlineNumber forKey:@"deadline"];
    NSString *json = [MFQiNiuUtil convertToJsonData:dic];
    return json;
}

+(NSString *)convertToJsonData:(NSMutableDictionary *)dict{
    NSError *error;
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&error];
    NSString *jsonString;
    if (!jsonData) {
        NSLog(@"%@",error);
    }else{
        jsonString = [[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding];
    }
    NSMutableString *mutStr = [NSMutableString stringWithString:jsonString];
    NSRange range = {0,jsonString.length};
    [mutStr replaceOccurrencesOfString:@" " withString:@"" options:NSLiteralSearch range:range];
    NSRange range2 = {0,mutStr.length};
    [mutStr replaceOccurrencesOfString:@"\n" withString:@"" options:NSLiteralSearch range:range2];
    return mutStr;
}

上传示例：

NSString *token = [MFQiNiuUtil makeToken:kQiNiuAccessKey secretKey:kQiNiuSecretKey];
    QNUploadManager *upManager = [[QNUploadManager alloc] init];
    NSData *data = [feedbackInfo dataUsingEncoding : NSUTF8StringEncoding];
    
    [upManager putData:data key:[NSString stringWithFormat:@"%@.txt",feedbackStr] token:token
              complete: ^(QNResponseInfo *info, NSString *key, NSDictionary *resp) {
                  NSLog(@"%@", info);
                  NSLog(@"%@", resp);
                  
              } option:nil];