如何在ios中找到原始图像中的像素位置 [英] How to find the pixel location in original image in ios

问题描述

我有一个尺寸为 480x360 的图像，并且在 UIImageview 中显示，框架为 (0, 0, 320, 568) 和 >aspectfill.

I have an image with size 480x360 and am displaying in UIImageview with frame (0, 0, 320, 568) with aspectfill.

当我触摸图像视图时，位置显示 (150,120).如何以原始图像 (480x360) 格式映射此位置?

When I touch the image view, location says (150,120). How can I map this location in my original image (480x360) format?

谢谢

推荐答案

您只需计算比例并将其应用于触摸位置点.

You just calculate the proportions and apply them to touch location point.

CGFloat _x = imageView.image.size.width / imageView.frame.size.width;
CGFloat _y = imageView.image.size.height / imageView.frame.size.height;

//assuming p - is CGPoint received from Touch event
CGPoint locationInImageView = CGPointMake(p.x * _x, p.y * _y);

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