iOS - 了解UIPanGesture上的velocityInView [英] iOS - Making sense of velocityInView on UIPanGesture

问题描述

我正在使用UIPanGesture来返回velocityInView，从我收集它应该是每秒返回点数。我得到的是数以亿计的数字和很多零...我不会在模拟器中快速移动我的鼠标。

I'm using a UIPanGesture to return velocityInView and from what I gather it's supposed to be returning points per second. What I am getting is numbers in the hundreds of millions and a lot of zeros... I'm not moving my mouse that quickly in the simulator.

我想。 ..

提前感谢您提供的任何帮助/建议。

Thanks in advance for any help/advice you have.

编辑：请求的代码。

显示/通话

-(void)handlePanGesture:(UIPanGestureRecognizer *) recognizer
{
    if (recognizer.state == UIGestureRecognizerStateChanged || 
        recognizer.state == UIGestureRecognizerStateBegan)
    {
        CGPoint vel = [recognizer velocityInView:myScrollView];
        //[self doSpinAnimationWithVelocity:vel.x];
        NSLog([NSString stringWithFormat:@"Velocity - X-Axis - %d ", vel.x]);
        NSLog([NSString stringWithFormat:@"Velocity - Y-Axis - %d ", vel.y]);
    }
}

此处输出图片，因为我仍然低于10代表

推荐答案

没有你的代码很难说...

without your code its hard to say...

CGPoint是由CGFloats组成，取决于你如何打印它们你可能会得到意想不到的结果

CGPoint is made up of CGFloats, depending on how you are printing them you could be getting unexpected results

你传递给velocityInView的视图：必须在视图层次结构中，检查它在将视图传递给velocityInView：方法

The view you pass into velocityInView: must be in the view hierarchy, check it by looking at the window property on the view before you pass it into the velocityInView: method

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