run task in a separate thread(ios)

Author: plrthink

example/package.json

@@ -11,7 +11,7 @@
     "react": "16.0.0-alpha.12",
     "react-native": "0.48.4",
     "react-native-cli": "^2.0.1",
-    "react-native-fs": "^2.5.2",
+    "react-native-fs": "^2.5.1",
     "react-native-zip-archive": "file:../"
   },
   "devDependencies": {

ios/RNZipArchive.m

@@ -24,8 +24,7 @@ @implementation RNZipArchive
 RCT_EXPORT_METHOD(unzip:(NSString *)zipPath
                   destinationPath:(NSString *)destinationPath
                   resolver:(RCTPromiseResolveBlock)resolve
-                  rejecter:(RCTPromiseRejectBlock)reject)
-{
+                  rejecter:(RCTPromiseRejectBlock)reject) {
 
     [self zipArchiveProgressEvent:0 total:1]; // force 0%
 
@@ -44,8 +43,7 @@ @implementation RNZipArchive
 RCT_EXPORT_METHOD(zip:(NSString *)zipPath
                   destinationPath:(NSString *)destinationPath
                   resolver:(RCTPromiseResolveBlock)resolve
-                  rejecter:(RCTPromiseRejectBlock)reject)
-{
+                  rejecter:(RCTPromiseRejectBlock)reject) {
 
     [self zipArchiveProgressEvent:0 total:1]; // force 0%
 
@@ -61,6 +59,10 @@ @implementation RNZipArchive
     }
 }
 
+- (dispatch_queue_t)methodQueue {
+    return dispatch_queue_create("com.mockingbot.ReactNative.ZipArchiveQueue", DISPATCH_QUEUE_SERIAL);
+}
+
 - (void)zipArchiveProgressEvent:(NSInteger)loaded total:(NSInteger)total {
     if (total == 0) {
         return;