[iOS] Use static regular expression instance for transform parsing. (#…

…2567)
apache · Jun 18, 2019 · a43c768 · a43c768
1 parent 07151c3
commit a43c768
Showing 1 changed file with 9 additions and 5 deletions.
diff --git a/ios/sdk/WeexSDK/Sources/Component/WXTransform.m b/ios/sdk/WeexSDK/Sources/Component/WXTransform.m
@@ -245,12 +245,16 @@ - (void)parseTransform:(NSString *)cssValue
         return;
     }
 
-    NSError *error = NULL;
-    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"(\\w+)\\((.+?)\\)"
-                                                                           options:NSRegularExpressionCaseInsensitive
-                                                                             error:&error];
+    static NSRegularExpression* parseRegex = nil;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        NSError *error = NULL;
+        parseRegex = [NSRegularExpression regularExpressionWithPattern:@"(\\w+)\\((.+?)\\)"
+                                                               options:NSRegularExpressionCaseInsensitive
+                                                                 error:&error];
+    });
 
-    NSArray *matches = [regex matchesInString:cssValue options:0 range:NSMakeRange(0, cssValue.length)];
+    NSArray *matches = [parseRegex matchesInString:cssValue options:0 range:NSMakeRange(0, cssValue.length)];
 
     for (NSTextCheckingResult *match in matches) {
         NSString *name = [cssValue substringWithRange:[match rangeAtIndex:1]];