Github user acton393 commented on the issue:
https://github.com/apache/incubator-weex/pull/1072
hi @xuyouyang thank you for your contribution, sure that's a bug, you are
very careful. and we can change the variable type in WXUtility.m or change the
type during its creation to fix it.
I found that `fontFamilyDic` is a second dictionary which is a object in
`fontStorage` which is also `WXThreadSafeDictionary` and its key is
'fontFamily', I'm concerning about that if we change the `fontFamilyDic` type
to `WXThreadSafeDictionary`, there can be a deadlock as
`WXThreadSafeDictionary` using lock to ensure its thread-safe.
so I think we can fix it by changing type in `WXUtility.m`.
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