[iOS] fix after layout change view.width==0 && view.height==0 the vie…

[mahaiyannn]

…w have not been refreshed.

First of all, thank you for your contribution!

Please makes sure that these checkboxes are checked before submitting your PR, thank you!

CheckList:

if isBugFix :

• Make sure that you add at least one unit test for the bug which you had fixed.

elif isNewFeature :

• Update API docs for the component.
• Update/Add demo to demonstrate new feature.
• Update test scripts for the feature.
• Add unit tests for the feature.

[weex-bot]

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📖	No android file has been changed.
📖	android build verification finished.

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