Swift 获取网络图片的尺寸

        do {
            let data:Data = try Data.init(contentsOf: NSURL.init(string: arrImage![i])! as URL)
            let image:UIImage = UIImage.init(data: data)!
            var height = image.size.height
            var width = image.size.width
            let scale = height / width
            width = WIDTH
            height = WIDTH * scale                
            ivImage.frame = CGRect(x:WIDTH * CGFloat(i), y:(HEIGHT - height)/2.0, width:width, height:height)
            ivImage.setImageWith(NSURL.init(string: arrImage![i])! as URL, placeholderImage: UIImage.init(named: "default"))
        } catch {
            
        }