解决了语音上传到问题，接下来要解决下载播放问题

Pods/HappyDNS/HappyDNS/Util/QNMD5.m

@@ -0,0 +1,28 @@
+//
+//  QNMD5.m
+//  HappyDNS_Mac
+//
+//  Created by 何昊宇 on 2018/4/25.
+//  Copyright © 2018年 Qiniu Cloud Storage. All rights reserved.
+//
+
+#import "QNMD5.h"
+#import <CommonCrypto/CommonDigest.h>
+
+@implementation QNMD5
+
++ (NSString *)MD5:(NSString *)string{
+    
+    const char* input = [string UTF8String];
+    unsigned char result[CC_MD5_DIGEST_LENGTH];
+    CC_MD5(input, (CC_LONG)strlen(input), result);
+    
+    NSMutableString *digest = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
+    for (NSInteger i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {
+        [digest appendFormat:@"%02x", result[i]];
+    }
+    
+    return digest;
+}
+
+@end