Crop image when draw line with hand - ios

Question

I have a Image view added on a view. View is using UIBezierPath and touch responder methods for drawing line upon dragging on screen. Now I would like to clip the part of image that are below the line. How can I achieve this.
I use below methods to draw line
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint p = [touch locationInView:self];
[path moveToPoint:p];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint p = [touch locationInView:self];
[path addLineToPoint:p]; // (4)
[self setNeedsDisplay];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
[self touchesMoved:touches withEvent:event];
}

Answer 1

Try this:
#property (strong, nonatomic) UIBezierPath *bezierPath;
//...
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint p = [touch locationInView:self];
//...
self.bezierPath = [UIBezierPath bezierPath];
[self.bezierPath moveToPoint:p];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint p = [touch locationInView:self];
//...
[self.bezierPath addLineToPoint:p];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
[self touchesMoved:touches withEvent:event];
// Here you can call -croppedImage; method and get the image you need.
}
- (UIImage *)croppedImage
{
[self.bezierPath closePath];
UIImage *image = //Your initial image;
CGSize imageSize = image.size;
CGRect imageRect = CGRectMake(0, 0, imageSize.width, imageSize.height);
UIGraphicsBeginImageContextWithOptions(imageSize, NO, [[UIScreen mainScreen] scale]);
// Create the clipping path and add it
[self.bezierPath addClip];
[image drawInRect:imageRect];
UIImage *croppedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return croppedImage;
}
This is a fast written code, so can be possible mistakes. Sorry for that :)