But use xcode9.1 it shows well.
It should be a bug of Xcode 9.2. Just use Xcode 9.1.
As for now, there are two ways:
move images from Assets.xcassets to bundle (thus loaded image from file instead of assets);
still use Xcode 9.1 till apple fixes the bug. (bug has been reported to apple)
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It should be a bug of Xcode 9.2. Just use Xcode 9.1.