UIImage, check if contain image

Question

If I instantiate a UIImage like this :

UIImage *image = [[UIImage alloc] init];

The object is created but it doesn\'t contain any image.

Answer 1

This is updated version of @Kreiri, I put in a method and fixed logic error:

- (BOOL)containsImage:(UIImage*)image {
    BOOL result = NO;

    CGImageRef cgref = [image CGImage];
    CIImage *cim = [image CIImage];

    if (cim != nil || cgref != NULL) { // contains image
        result = YES;
    }

    return result;
}

An UIImage could only based on CGImageRef or CIImage. If both is nil means there is no image. Example use of giving method:

if (![self containsImage:imageview.image]) {
    [self setImageWithYourMethod];
}

hope it will help someone.