fix: cache added synchronized

SVGAPlayer.podspec

@@ -1,7 +1,7 @@
 
 Pod::Spec.new do |s|
   s.name         = "SVGAPlayer"
-  s.version      = "2.5.4"
+  s.version      = "2.5.5"
   s.summary      = "SVGAPlayer 是一个高性能的动画播放器"
   s.description  = <<-DESC
                    SVGA 是一种全新的动画格式，由 YY UED 团队主导开发；

SVGAPlayer/ViewController.m

@@ -50,6 +50,7 @@ static SVGAParser *parser;
                        @"https://github.com/yyued/SVGA-Samples/blob/master/rose.svga?raw=true",
                        ];
     [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
+//    parser.enabledMemoryCache = YES;
     [parser parseWithURL:[NSURL URLWithString:items[arc4random() % items.count]]
          completionBlock:^(SVGAVideoEntity * _Nullable videoItem) {
              [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
@@ -66,6 +67,7 @@ static SVGAParser *parser;
                                                 NSParagraphStyleAttributeName: para,
                                             }];
                  [self.aPlayer setAttributedText:str forKey:@"banner"];
+                 
 //                 self.aPlayer.mianRunLoopMode = NSDefaultRunLoopMode;
                  [self.aPlayer startAnimation];
              }

Source/SVGAVideoEntity.m

@@ -209,19 +209,27 @@ static NSMapTable * weakCache;
 }
 
 + (SVGAVideoEntity *)readCache:(NSString *)cacheKey {
-    SVGAVideoEntity * object = [videoCache objectForKey:cacheKey];
-    if (!object) {
-        object = [weakCache objectForKey:cacheKey];
+    @synchronized (videoCache) {
+        SVGAVideoEntity * object = [videoCache objectForKey:cacheKey];
+        if (!object) {
+            @synchronized (weakCache) {
+                object = [weakCache objectForKey:cacheKey];
+            }
+        }
+        return object;
     }
-    return object;
 }
 
 - (void)saveCache:(NSString *)cacheKey {
-    [videoCache setObject:self forKey:cacheKey];
+    @synchronized (videoCache) {
+        [videoCache setObject:self forKey:cacheKey];
+    }
 }
 
 - (void)saveWeakCache:(NSString *)cacheKey {
-    [weakCache setObject:self forKey:cacheKey];
+    @synchronized (weakCache) {
+        [weakCache setObject:self forKey:cacheKey];
+    }
 }
 
 @end