Question

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

Answer 1

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();