How to save the UIImage after multi point cropping the image? - iphone

Question

I want to multi point crop on the image(See the image). Its working fine. My problem is after crop the image the how to I save UIImage. I am using the CAShapeLayer for crop image. Below code using for multi point crop.
- (void)multiPointCrop:(CGPoint)cropPoint
{
UIBezierPath *aPath = [UIBezierPath bezierPath];
[aPath moveToPoint:cropPoint];
for (NSString *pointString in self.touchPoints) {
if ([self.touchPoints indexOfObject:pointString] != 0)
[aPath addLineToPoint:CGPointFromString(pointString)];
}
[aPath addLineToPoint:cropPoint];
[aPath closePath];
[self setClippingPath:aPath andView:self];
[self setNeedsDisplay];
}
- (void)setClippingPath:(UIBezierPath *)clippingPath andView:(UIView *)view;
{
if (![[view layer] mask])
[[view layer] setMask:[CAShapeLayer layer]];
[(CAShapeLayer*) [[view layer] mask] setPath:[clippingPath CGPath]];
}
How to I save UIImage from the CAShapeLayer? If this is the correct way for multi cropping or any other easy way to achieve this. Please give your ideas, suggestions, source code, etc. Anything always welcome.

Answer 1

Try rendering layer into a context and creating an image from that context.
CALayer *layer = view.layer;
CGSize s = layer.frame.size;
// create context
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL, s.width, s.height,
8, (s.width * 4),
colorSpace, kCGImageAlphaPremultipliedLast);
// flip Y
CGContextTranslateCTM(context, 0.0, s.height);
CGContextScaleCTM(context, 1.0, -1.0);
// render layer
[layer renderInContext:context];
CGImageRef imgRef = CGBitmapContextCreateImage(context);
// here is your image
UIImage *img = [UIImage imageWithCGImage:imgRef];
// release owned memory
CGImageRelease(imgRef);
CGColorSpaceRelease(colorSpace);
CGContextRelease(context);