You mean Apple should shift production to somewhere where costs are higher (let's ignore skill and quality for now) and do what? Apple's net profit margins are in the 20-30% range. Apple would have to raise prices by 50% or 100% or 200%. How would Apple compete with other computer, smartphone, and other companies? People are going to buy a $2000 or $3000 iPhone instead of a $1000 iPhone because it's Made in America?
Moving production completely to the United States would require decades of work, hundreds of billions of dollars, and huge price increases.
If this tariff happens, all Apple needs to do is list the product price, slap on a "25% Trump tax" (call it that -- Trump would threaten Apple, but Apple would absolutely win the ensuing court case), and sell at the higher prices. We just need every business to be that clear about the effects of tariffs in their pricing. If Trump wants to enact bold, beautiful tariffs, he should take full responsibility for them and accept them as his tax on importers and consumers. Obama got "Obamacare", Trump can own the "Trump tax" of tariffs.