Description
WXBridgeManager has a private class method sharedManager that only used in [WXBridgeManager jsThread], see https://github.com/apache/incubator-weex/blob/release-0.16/ios/sdk/WeexSDK/Sources/Manager/WXBridgeManager.m#L45.
But [WXSDKManager bridgeMgr] create its own WXBridgeManager instance, is this designed or just left over from the past? Should [WXSDKManager bridgeMgr] just use [WXBridgeManager sharedManager]?