how to get width and height of image from url without downloading?

Question

I'm using SDWebImage for showing images inside cells. But it is perfect mached to frame of UImageView that I'm doing in code below:

NSString * s =[NSString stringWithFormat:@"url of image to show"];
        NSURL *url = [NSURL URLWithString:s];
        [cell.shopImageView sd_setImageWithURL:url];

My UIImageView is size 50x50.

For example image from url is size 990x2100 and my image is not displaying well in the frame given. In this case when hight is bigger, I want to resize my image by proper height ratio to match width 50.

Is there a way to check image's size from url without downloading it and allocating memory in awful way?

Answer 1

You can fetch this data from URL header, in Swift 3.0 use below code

 if let imageSource = CGImageSourceCreateWithURL(url! as CFURL, nil) {
     if let imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, nil) as Dictionary? {
          let pixelWidth = imageProperties[kCGImagePropertyPixelWidth] as! Int
          let pixelHeight = imageProperties[kCGImagePropertyPixelHeight] as! Int
          print("the image width is: \(pixelWidth)")
          print("the image height is: \(pixelHeight)")
       }
   }