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标题:IOS上传图片/文件的通用方法（含时间戳验证和Sign签名）
正文:
(NSString*) memberUploadavatar:(UIImage *)image { NSString *action = @"action=uploadavatar"; NSString *mainUrl = [self getMainUrl]; NSString *unixTime = [NSString stringWithFormat:@"timestamp=%ld", (time_t) [[NSDate date] timeIntervalSince1970]];// NSString *unixTime = @"timestamp=1429629388"; NSMutableArray *nameList = [[NSMutableArray alloc] init]; [nameList addObject:unixTime]; [nameList addObject:action]; NSString *sign = [self generateSign:mainUrl nameList:nameList]; NSString *url = [NSString stringWithFormat:@"%@?%@&%@&sign=%@", mainUrl,
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