UIpicker scrolling sound

I getting mad doing the research for the solution of this method. I want to control or disable the clicking sound whenever the picker is scrolled. now i want to use the documented one. Can you help me solve this at the range of 1 day? please I reall开发者_如何学Goy need to do this as fast as i could. But I guess you can give me some hint to solve this problem.

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[thePickerView setSoundsEnabled:NO];

There's no documented way to do this.