iOS Create Thumbnail by means of offscreen image context
02 Oct 2015
- (void)setThumbnailFromImage:(UIImage *)image {
CGSize origImageSize = image.size;
CGRect newRect = CGRectMake(0, 0, 40, 40);
float ratio = MAX(newRect.size.width / origImageSize.width, newRect.size.height / origImageSize.height);
UIGraphicsBeginImageContextWithOptions(newRect.size, NO, ratio);
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:newRect cornerRadius:5.0];
[path addClip];
CGRect thumbRect;
thumbRect.size.width = ratio * origImageSize.width;
thumbRect.size.height = ratio * origImageSize.height;
thumbRect.origin.x = (newRect.size.width - thumbRect.size.width) / 2.0;
thumbRect.origin.y = (newRect.size.height - thumbRect.size.height) / 2.0;
[image drawInRect:thumbRect];
UIImage *thumbnail = UIGraphicsGetImageFromCurrentImageContext();
//Get the thumbnail
//self.thumbnail = thumbnail;
UIGraphicsEndImageContext();
}