将 UIImageView 触摸坐标转换为 UIImage 坐标

Converting UIImageView Touch Coordinates to UIImage Coordinates(将 UIImageView 触摸坐标转换为 UIImage 坐标)

问题描述

我能够确定 UIImageView 上的触摸事件的坐标.然后我需要将这些坐标转换为正在显示的图像的坐标 - 这应该是不同的，因为我的图像比 UIImageView 大得多，并且我正在使用 AspectFit 缩放图像.

I'm able to determine the coordinates of a touch event on a UIImageView. I need to then convert these coordinates to the coordinates of the image being displayed - which should be different, since my image is much larger than the UIImageView and I'm scaling the image with AspectFit.

在给定 UIImageView 的视图坐标的情况下，确定触摸事件的图像坐标的最佳方法是什么?

What's the best way to determine the image coordinates of a touch event given the view coordinates of a UIImageView?

推荐答案

这样的事情应该能让你继续前进.

Something like this should get you going.

CGPoint imageViewPoint = [touch locationInView:imageView];

float percentX = imageViewPoint.x / imageView.frame.size.width;
float percentY = imageViewPoint.y / imageView.frame.size.height;

CGPoint imagePoint = CGPointMake(image.size.width * percentX, image.size.height * percentY);

假设 UIImageView 被称为 imageView UITouch 被称为 touch 而 UIImage 被称为 image.

Assuming the UIImageView is called imageView the UITouch is called touch and the UIImage is called image.

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