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This may be someone else's library covering your operations. Others can modify your animation operations in runtime or during execution.
If this is the case, you can find out how others implement it, remove other people's influence on you, or change it

The iOS FAQ community will answer your questions
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It may be due to multi-threading

Don’t think about the reason in a strange direction, it has absolutely nothing to do with ios-fontawesome

I don’t think it matters either