Issue With drawViewHierarchyInRect: afterScreenUpdates while taking snapshot - objective-c

Question

I am facing problem with taking snapshot of UIView along with CAEmitterLayer. Below is the code which I am using for taking snapshot:
here editingView is my UIView:
UIGraphicsBeginImageContextWithOptions(editingView.bounds.size, NO, 0.0);
[editingView drawViewHierarchyInRect:editingView.bounds afterScreenUpdates:YES];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Please go through the below links for Gif Images
Link For For afterScreenUpdates:NO (Gif) in this case I am missing Snapshot data
Link For For afterScreenUpdates:YES (Gif) in this case uiview is blinking and then updated and also facing performance issue.

Answer 1

I've had similar a similar issue in the past. The following might work for you as a workaround:
UIGraphicsBeginImageContextWithOptions(editingView.bounds.size, NO, 0.0);
[editingView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Note that you may lose some accuracy in the screen capture, as it may exclude blurs, and some Core Animation features.
Edit:
There seems to be issues/tradeoffs with both renderInContext and drawViewHierarchyInRect. The following code may be worth a try (taken from here for reference):
- (CGContextRef) createBitmapContextOfSize:(CGSize) size {
CGContextRef context = NULL;
CGColorSpaceRef colorSpace;
int bitmapByteCount;
int bitmapBytesPerRow;
bitmapBytesPerRow = (size.width * 4);
bitmapByteCount = (bitmapBytesPerRow * size.height);
colorSpace = CGColorSpaceCreateDeviceRGB();
if (bitmapData != NULL) {
free(bitmapData);
}
bitmapData = malloc( bitmapByteCount );
if (bitmapData == NULL) {
fprintf (stderr, "Memory not allocated!");
return NULL;
}
context = CGBitmapContextCreate (bitmapData,
size.width,
size.height,
8, // bits per component
bitmapBytesPerRow,
colorSpace,
kCGImageAlphaNoneSkipFirst);
CGContextSetAllowsAntialiasing(context,NO);
if (context== NULL) {
free (bitmapData);
fprintf (stderr, "Context not created!");
return NULL;
}
CGColorSpaceRelease( colorSpace );
CGAffineTransform flipVertical = CGAffineTransformMake(1, 0, 0, -1, 0, size.height);
CGContextConcatCTM(context, flipVertical);
return context;
}
Then you can do:
CGContextRef context = [self createBitmapContextOfSize:editingView.bounds.size];
[editingView.layer renderInContext:context];
CGImageRef cgImage = CGBitmapContextCreateImage(context);
UIImage* background = [UIImage imageWithCGImage: cgImage];
CGImageRelease(cgImage);