You can add this as a category to UIView and it will be accessible for any view
- (UIImage*) snapshot
{
UIGraphicsBeginImageContextWithOptions(self.frame.size, YES /*opaque*/, 0 /*auto scale*/);
[self.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage* image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
Then you just need to do [self addSubview:[[UIImageView alloc] initWithImage:self.snapshot]]
from you cell object.
[EDIT]
Providing the need for asynchronous rendering (totally understandable) this can be achieved using dispatch queues. I think this would work:
typedef void(^ImageOutBlock)(UIImage* image);
- (void) snapshotAsync:(ImageOutBlock)block
{
CGFloat scale = [[UIScreen mainScreen] scale];
CALayer* layer = self.layer;
CGRect frame = self.frame;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^() {
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL, frame.size.width * scaleFactor, frame.size.height * scaleFactor, 8, frame.size.width * scaleFactor * 4, colorSpace, kCGImageAlphaPremultipliedFirst);
UIGraphicsBeginImageContextWithOptions(frame.size, YES /*opaque*/, scale);
[layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage* image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
dispatch_async(dispatch_get_main_queue(), ^() {
block(image);
});
});
}
[EDIT]
- (void) execute
{
__weak typeof(self) weakSelf = self;
[self snapshotAsync:^(UIImage* image) {
[weakSelf addSubview:[[UIImageView alloc] initWithImage:image]]
}];
}