如何识别拖动动作 [英] How do you recognize drag gestures

问题描述

我有几个按钮，在我看来，建立了使用IB。每个按钮触发一个简短的音频声音。

I have several buttons in my view built using IB. Each button triggers a short audio sound.

我希望能够拖我的手指在他们触发他们......就像你拖动你的手指在钢琴键（不要担心我不是钢琴应用程序）

I want to be able to drag my finger over them to trigger them... just like you are dragging your finger over piano keys (don't worry I am not making a piano app)

我无法弄清楚如何识别按钮外，然后里面淡淡的。

I cant figure out how to recognize a touch outside the button and then inside it.

任何想法？

感谢

推荐答案

由于从UIControl你的按钮子类，你可以用UIControl的实现手势识别的。

As your buttons subclass from UIControl, you can use UIControl's implementation of recognition of gestures.

看UIControl的 - （无效）addTarget：（ID）目标的行动：（SEL）动作forControlEvents：（UIControlEvents）controlEvents 。这将让你无论何时指定某些事件发生时被称为对象的方法。可能的事件，其中包括：

Look at UIControl's - (void)addTarget:(id)target action:(SEL)action forControlEvents:(UIControlEvents)controlEvents. This will let you specify a method on an object to be called whenever certain events occur. The possible events are, among others:

   UIControlEventTouchDragInside     = 1 <<  2,
   UIControlEventTouchDragOutside    = 1 <<  3,
   UIControlEventTouchDragEnter      = 1 <<  4,

一个完整列表可在苹果的<一个href=\"http://developer.apple.com/IPhone/library/documentation/UIKit/Reference/UIControl%5FClass/Reference/Reference.html#//apple%5Fref/doc/constant%5Fgroup/Control%5FEvents\"相对=nofollow>为控制事件文档。

A complete list is available in Apple's documentation for Control Events.

在 UIControlEventDragOutside 火灾，你可能需要重新评估其观点正在播放。

When UIControlEventDragOutside fires, you may want to reevaluate which view is currently playing.

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