Use CGContextClip to clip a circle with image

Question

Have a imageViewA (frame{0,0,320,200}) in my app, and I want to clip a circle with the imageViewA's center, radius=50, and draw into another imageViewB (frame{0,0,100,100}); the original image effect like this :

and use below code to clip:

UIGraphicsBeginImageContext(self.frame.size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGFloat height = self.bounds.size.height;
CGContextTranslateCTM(ctx, 0.0, height);
CGContextScaleCTM(ctx, 1.0, -1.0);
CGContextAddArc(ctx, self.frame.size.width/2, self.frame.size.height/2, 50, 0, 2*M_PI, 0);
CGContextClosePath(ctx);
CGContextSaveGState(ctx);
CGContextClip(ctx);
CGContextDrawImage(ctx, CGRectMake(0,0,self.frame.size.width, self.frame.size.height), image.CGImage);
CGContextRestoreGState(ctx);
CGImageRef imageRef = CGBitmapContextCreateImage (ctx);
UIImage *newImage = [UIImage imageWithCGImage:imageRef];
NSString *headerPath = [NSString stringWithFormat:@"%@/header.png",HomeDirectory];
NSData *imageData = UIImageJPEGRepresentation(newImage, 1.0);
if([imageData writeToFile:headerPath atomically:YES]){
    imageViewB.image = [UIImage imageWithContentsOfFile:headerPath];
}

clip image effect like this:

I only need the circle view, but the clip effect display that imageViewB has white space. How to clip this image correctly? Thanks!

Answer 1

imageViewB.layer.cornerRadius = 50.0;
imageViewB.layer.masksToBounds = YES;

Answer 2

JPEG doesn't support transparency. Use UIImagePNGRepresentation instead of UIImageJPEGRepresentation, and you will have the result you want.

NSData *imageData = UIImagePNGRepresentation(newImage);
if([imageData writeToFile:headerPath atomically:YES]){
    imageViewB.image = [UIImage imageWithContentsOfFile:headerPath];
}