如何赋予UIImage负面色彩效果 [英] how to give UIImage negative color effect

问题描述

这是我的第一个问题。

我有一个应用程序，其中我想更改图像效果看起来像负色效果

This is my first question.
I have an app in which i want to change the image effect look like negative color effect

推荐答案

这很简单你必须选择图像并在下面的代码中设置图像

it's so simple you have to choose image and set the image in the below code

UIGraphicsBeginImageContext(renderImage.size);
 CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeCopy);
 [renderImage drawInRect:CGRectMake(0, 0, renderImage.size.width, renderImage.size.height)];
 CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeDifference);
 CGContextSetFillColorWithColor(UIGraphicsGetCurrentContext(),[UIColor whiteColor].CGColor);
 CGContextFillRect(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, renderImage.size.width, renderImage.size.height));
 renderImage = UIGraphicsGetImageFromCurrentImageContext();
 UIGraphicsEndImageContext();

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