解决了语音上传到问题，接下来要解决下载播放问题

Pods/Qiniu/QiniuSDK/Http/Dns/QNDnsCacheFile.m

@@ -0,0 +1,91 @@
+//
+//  QNDnsCacheFile.m
+//  QnDNS
+//
+//  Created by yangsen on 2020/3/26.
+//  Copyright © 2020 com.qiniu. All rights reserved.
+//
+
+#import "QNDnsCacheFile.h"
+
+@interface QNDnsCacheFile()
+
+@property(nonatomic,  copy)NSString *directory;
+
+@end
+@implementation QNDnsCacheFile
+
++ (instancetype)dnsCacheFile:(NSString *)directory
+                       error:(NSError **)error{
+    NSError *err = nil;
+    [[NSFileManager defaultManager] createDirectoryAtPath:directory withIntermediateDirectories:YES attributes:nil error:&err];
+    if (err != nil) {
+        if (error != nil) *error = err;
+        return nil;
+    }
+    
+    QNDnsCacheFile *f = [[QNDnsCacheFile alloc] init];
+    f.directory = directory;
+    return f;
+}
+
+- (NSError *)set:(NSString *)key data:(NSData *)value {
+    @synchronized (self) {
+        NSError *error;
+        NSFileManager *fileManager = [NSFileManager defaultManager];
+        NSString *filePath = [self pathOfKey:key];
+        if ([fileManager fileExistsAtPath:filePath]) {
+            [fileManager removeItemAtPath:filePath error:&error];
+        }
+        [fileManager createFileAtPath:filePath contents:value attributes:nil];
+        return error;
+    }
+}
+
+- (NSData *)get:(NSString *)key {
+    return [NSData dataWithContentsOfFile:[self pathOfKey:key]];
+}
+
+- (NSError *)del:(NSString *)key {
+    @synchronized (self) {
+        NSError *error = nil;
+        NSString *path = [self pathOfKey:key];
+        if (path) {
+            NSFileManager *fileManager = [NSFileManager defaultManager];
+            [fileManager removeItemAtPath:path error:&error];
+        }
+        return error;
+    }
+}
+
+- (void)clearCache:(NSError *__autoreleasing  _Nullable *)error {
+    @synchronized (self) {
+        NSError *err;
+        NSFileManager *fileManager = [NSFileManager defaultManager];
+        [fileManager removeItemAtPath:self.directory error:&err];
+        if (err != nil) {
+            if (error != nil) *error = err;
+            return;
+        }
+        
+        [fileManager createDirectoryAtPath:self.directory withIntermediateDirectories:YES attributes:nil error:&err];
+        if (error != nil) {
+            *error = err;
+        }
+    }
+}
+
+- (NSString *)getFileName{
+    return @"dnsCache";
+}
+
+- (NSString *)pathOfKey:(NSString *)key {
+    return [QNDnsCacheFile pathJoin:key path:_directory];
+}
+
++ (NSString *)pathJoin:(NSString *)key
+                  path:(NSString *)path {
+    return [[NSString alloc] initWithFormat:@"%@/%@", path, key];
+}
+
+@end