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How to change range of update for UISlider when VoiceOver is on?

When VoiceOver is on, select a UISlider and swipe up/down with 1 finger will increase/decrease the value by 10% . I'm trying to make a bigger change ( 25% ). How would I do that? Thanks.

子类UISlider并实现accessibilityIncrementaccessibilityDecrement是答案。

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