Capture overlay image without setting drawInRect - iphone

Question

I need to take overlay image without setting drawInRect. When i set drawInRect it gives output of setting size. I need to take picture with new size without using following code.
- (void)captureStillImageWithOverlay:(UIImage*)overlay
{
AVCaptureConnection *videoConnection = nil;
for (AVCaptureConnection *connection in [[self stillImageOutput] connections]) {
for (AVCaptureInputPort *port in [connection inputPorts]) {
if ([[port mediaType] isEqual:AVMediaTypeVideo]) {
videoConnection = connection;
break;
}
}
if (videoConnection) {
break;
}
}
NSLog(#"about to request a capture from: %#", [self stillImageOutput]);
[[self stillImageOutput] captureStillImageAsynchronouslyFromConnection:videoConnection
completionHandler:^(CMSampleBufferRef imageSampleBuffer, NSError *error) {
CFDictionaryRef exifAttachments = CMGetAttachment(imageSampleBuffer, kCGImagePropertyExifDictionary, NULL);
if (exifAttachments) {
NSLog(#"attachements: %#", exifAttachments);
} else {
NSLog(#"no attachments");
}
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
UIImage *image = [[UIImage alloc] initWithData:imageData];
CGSize imageSize = [image size];
CGSize overlaySize = [overlay size];
UIGraphicsBeginImageContext(imageSize);
[image drawInRect:CGRectMake(0, 0, imageSize.width, imageSize.height)];
CGFloat xScaleFactor = imageSize.width / 320;
CGFloat yScaleFactor = imageSize.height / 480;
[overlay drawInRect:CGRectMake(30 * xScaleFactor, 100 * yScaleFactor, overlaySize.width * xScaleFactor, overlaySize.height * yScaleFactor)]; // rect used in AROverlayViewController was (30,100,260,200)
// [overlay drawInRect:CGRectMake(30 * xScaleFactor, 100 * yScaleFactor, overlaySize.width * xScaleFactor, overlaySize.width* yScaleFactor)];
UIImage *combinedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// NSData * data = UIImagePNGRepresentation(image);
// [data writeToFile:#"foo.png" atomically:YES];
[self setStillImage:combinedImage];
[image release];
[[NSNotificationCenter defaultCenter] postNotificationName:kImageCapturedSuccessfully object:nil];
}];
}

Answer 1

Try this code :
UIGraphicsBeginImageContext(self.view.bounds.size);
// retrieve the current graphics context
CGContextRef context = UIGraphicsGetCurrentContext();
// render view into context
[self.view.layer renderInContext:context];
// create image from context
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
image=[self cropImage:image];
UIGraphicsEndImageContext();
- (UIImage *)cropImage:(UIImage *)oldImage
{
CGSize imageSize = oldImage.size;
UIGraphicsBeginImageContextWithOptions(CGSizeMake( imageSize.width,imageSize.height - 150),NO,0.);
[oldImage drawAtPoint:CGPointMake( 0, -80) blendMode:kCGBlendModeCopy alpha:1.];
UIImage *croppedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return croppedImage;
}