Change UIImage render mode at runtime

Question

In an app I am working on I have some UIImageViews that may (or may not) need to be customised. How can I change the rendering mode of an image that was loaded as original to template at runtime?

Answer 1

You can init a UIImage from another cgImage, then you can render it as you need

ExampleCode

let originalImage = UIImage(named: "TimeClock2Filled")?.withRenderingMode(.alwaysOriginal)
if let original = originalImage?.cgImage {
    let image2 = UIImage(cgImage: original).withRenderingMode(.alwaysTemplate)
}

Example code Objective-C

UIImage * image = [[UIImage imageNamed:@"TimeClock2Filled"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
if(image.CGImage != nil) {
    UIImage * image2 = [[UIImage imageWithCGImage:image.CGImage]imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
}

this works just fine was tested