修复预加载delegate未回调的问题

Author: changsanjiang

SJMediaCacheServer.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'SJMediaCacheServer'
-  s.version          = '2.0.2'
+  s.version          = '2.0.3'
   s.summary          = <<-DESC
   SJMediaCacheServer 是一个高效的 HTTP 媒体缓存框架，旨在代理媒体数据请求并优先提供缓存数据，从而减少网络流量并增强播放的流畅性。该框架支持两种类型的远程资源：基于文件的媒体，如 MP3、AAC、WAV、FLAC、OGG、MP4 和 MOV 等常见格式，以及 HLS（HTTP Live Streaming）流。它会自动解析 HLS 播放列表并代理各个媒体片段。
   DESC

SJMediaCacheServer/Core/Prefetch/FILEPrefetcher.m

@@ -38,7 +38,6 @@ @interface FILEPrefetcher () <MCSAssetReaderDelegate> {
 @end
 
 @implementation FILEPrefetcher
-@synthesize delegate = _delegate;
 
 - (instancetype)initWithURL:(NSURL *)URL prefetchSize:(NSUInteger)bytes delegate:(nullable id<MCSPrefetcherDelegate>)delegate {
     NSParameterAssert(bytes != 0);
@@ -89,7 +88,7 @@ - (void)prepare {
 
                 FILEAsset *asset = [MCSAssetManager.shared assetWithURL:mURL];
                 if ( asset == nil || ![asset isKindOfClass:FILEAsset.class] ) {
-                    [_delegate prefetcher:self didCompleteWithError:[NSError mcs_errorWithCode:MCSAbortError userInfo:@{
+                    [mDelegate prefetcher:self didCompleteWithError:[NSError mcs_errorWithCode:MCSAbortError userInfo:@{
                         MCSErrorUserInfoObjectKey : self,
                         MCSErrorUserInfoReasonKey : [NSString stringWithFormat:@"无效的预加载请求: URL=%@", mURL]
                     }]];
@@ -98,7 +97,7 @@ - (void)prepare {
 
                 if ( asset.isStored ) {
                     mProgress = 1;
-                    [_delegate prefetcher:self didCompleteWithError:nil];
+                    [mDelegate prefetcher:self didCompleteWithError:nil];
                     return;
                 }
 
@@ -172,9 +171,7 @@ - (void)reader:(nonnull id<MCSAssetReader>)reader hasAvailableDataWithLength:(NS
 
                     MCSPrefetcherDebugLog(@"%@: <%p>.prefetch { prefetchSize: %lu, total: %lu, progress: %f };\n", NSStringFromClass(self.class), self, (unsigned long)mPrefetchSize, (unsigned long)reader.response.totalLength, progress);
 
-                    if ( _delegate != nil ) {
-                        [_delegate prefetcher:self progressDidChange:progress];
-                    }
+                    [mDelegate prefetcher:self progressDidChange:progress];
 
                     if ( mCurReader.status == MCSReaderStatusFinished ) {
                         [self _readDidFinish:reader];