CODEWITHSUNDEEP
iphoneobjective-ciosuiimagetransparency
eidolonxlj
eidolonxlj

Reputation:

How to get a transparent region from UIImage?

I develop a client app.
My question is: under the iPhone platform, how do I get a transparent region from UIImage?

Upvotes: 1

Views: 397

Answers (2)

Wubao Li
Wubao Li

Reputation: 1748

create a mask layer to control the transparent region of the image.

see apple documentation here: https://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/CoreAnimation_guide/Articles/LayerVisProps.html#//apple_ref/doc/uid/TP40006074-SW21

Upvotes: 0

Srikar Appalaraju
Srikar Appalaraju

Reputation: 73588

You would need to use image masking. Try this -

UIImage *image = [UIImage imageNamed:@"yourImage.png"];
const float colorMasking[6] = {1.0, 1.0, 0.0, 0.0, 1.0, 1.0};
image = [UIImage imageWithCGImage: CGImageCreateWithMaskingColors(image.CGImage, colorMasking)];

Upvotes: 2

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