如何减慢UIPanGestureRecognizer的速度? [英] How to slow down the speed of UIPanGestureRecognizer?

问题描述

我有一个方法，当识别出两根手指的平移手势时，我想调用该方法.我已经设置好并且可以正常工作，但是问题是只有大约15次需要调用该方法(它会过滤图像)，而当我平移大约一英寸时，该方法已被调用一百次，图像拍得太快了，我不知道发生了什么.

I have a method that I would like to call when a 2 finger pan gesture is recognized. I have it setup and working ok, but the problem is that there is only about 15 times I need the method to be called (it filters through images), and by the time I've panned about an inch, the method has been called a hundred times and the images went by so fast I didn't know what was going on.

我该怎么做以减慢我的手势识别器?

What can I do to slow down my gesture recognizer?

UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];
[panRecognizer setMinimumNumberOfTouches:2];
[panRecognizer setMaximumNumberOfTouches:2];
[panRecognizer setDelegate:self];
[self view] addGestureRecognizer:panRecognizer]];

推荐答案

大概是每次发生pan事件时您都在更改图像.那不是很好.相反，您应该询问平移手势识别器的拖动距离(使用-translationInView:)，并且只有在超过特定阈值后才更改图像.

Presumably you're changing images every time you get a pan event. That's not very good. Instead you should ask the pan gesture recognizer for the drag distance (use -translationInView:) and only change images once you've passed a specific threshold.

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