ios - How to make the spritenode's velocity work the same when making a universal app in sprite kit -

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When I am making a universal game, I apply an impulse to a subject. It works very well in the iphone simulator but when it comes to iPad simulator, the impulse is very small. Then I change the impulse to be applied directly with the speed, it works a little better, but not enough, can anyone tell me why it works differently?


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