选择图像的一部分（剪辑） [英] select part of image (clipping)

问题描述

这可能不像我想的那么难，但如何选择图像的一部分？请考虑以下示例：

This is probably not as hard as I think it is, but how can I select part of an image? Consider the following example:

灰色区域是PNG或JPG格式的图片，现在我想从中选择红色的80x80像素区域。应显示红色区域，其余不显示。我尝试了许多方法：

The grey area is an image in the PNG or JPG Format, now I want to select the red 80x80 px area from it. The red area should be displayed, the rest not. I have tried numerous approaches:

• 将UIImageView的clipsToBounds设置为YES并尝试偏移图像>
  
• 剪辑上方视图（不起作用）

我还看了一下绘图函数，但我还没有与这些工作，它似乎有点拖延了我。有什么明显的方式做我想做的，我错过了吗？

I also had a look at the drawing functions, yet I have not worked with these yet and it seemed a little bit far fetched to me. Is there any obvious way for doing what I want to do that I am missing out on? I do not want the image to be resized, just clipped.

推荐答案

感谢您抽出时间！方案

如果只想显示图像的中心，通过IB将 UIImageView 设置为Aspect Fill。

If you only want to show the center of the image an a UIImageView set the content mode to "Aspect Fill" via IB. That will center it and crop off anything extra.

或在代码中

myImageView.contentMode = UIViewContentModeScaleAspectFill;

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