iOS-手势识别器翻译 [英] iOS - Gesture Recognizer translationInView

问题描述

我在平移手势识别器中使用以下代码行:

I use the following line of code in a pan gesture recognizer:

CGPoint translation = [sender translationInView:self.view];

如果我将关联的处理移至长按手势识别器，则没有translationInView方法.

If I move the associated processing to a long press gesture recognizer, there is not a translationInView method.

我的问题是，如果使用长按识别器，如何获得相同的翻译价值?

My question is, how can I get the same value for translation if using the long-press recognizer?

谢谢

推荐答案

感谢您的答复.我真正要寻找的是translationInView的计算，这与locationInView不同.我用以下代码解决了这个问题:

Thanks for your reply. What I was really looking for was the computation for translationInView, which is different from locationInView. I resolved this with the following code:

CGPoint location = [sender locationInView:self.view];
CGPoint translation;
translation.x = location.x - viewStartLocation.x;
translation.y = location.y - viewStartLocation.y;

这确实需要我跟踪起始位置，这与平移手势识别器无关，但它似乎运行良好.我的其余代码以翻译而不是位置为中心，因此我试图避免为了保持一致性而不得不重写其他代码.

It does require me to track the starting location, which I didn't have to do with the pan gesture recognizer, but it seems to work well. The rest of my code is centered around the translation rather than the location, so I was trying to avoid having to rewrite that other code just for the sake of consistency.

再次感谢您抽出宝贵时间来答复.

Thanks again for taking time to reply.

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