观察UISlider的价值 - iPhone KVO [英] Observing a UISlider's value - iPhone KVO

问题描述

默认情况下，当我观察到UISlider的值，它只更新一次，当滑块被点击，不是连续，即使是滑块的设置。
是否有办法获得滑块的连续值更改？

By default, when I observe the value of a UISlider, it only updates once, when the slider is clicked, not continuously, even thought that is the slider's setting. Is there a way to get the continuous value change of the slider?

推荐答案

UIKit不主动支持KVO 。你可能会幸运，有些通知可能会通过通常的机制，但在大多数情况下，你不应该假设你可以使用KVO与任何UIKit类。

UIKit doesn't actively support KVO. You may be getting lucky in that some notifications may make it through the usual mechanisms, but for the most part you shouldn't assume you can use KVO with any UIKit class.

你应该通过UISlider的关联目标的动作方法获得你的连续事件。

You should instead get your continuous events through the UISlider's associated target's action method.

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