根据图片URL获取图片的尺寸【Swift语言实现】

import UIKit

 

extension UIImage {

 

 

    /// 获取网络图片尺寸

    ///

    /// - Parameter url: 网络图片链接

    /// - Returns: 图片尺寸size

    class func getImageSize(_ url: String?) -> CGSize {

 

        guard let urlStr = url else {

            return CGSize.zero

        }

        let tempUrl = URL(string: urlStr)

 

        let imageSourceRef = CGImageSourceCreateWithURL(tempUrl! as CFURL, nil)

        var width: CGFloat = 0

        var height: CGFloat = 0

        if let imageSRef = imageSourceRef {

            let imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSRef, 0, nil)

 

            if let imageP = imageProperties {

                let imageDict = imageP as Dictionary

                width = imageDict[kCGImagePropertyPixelWidth] as! CGFloat

                height = imageDict[kCGImagePropertyPixelHeight] as! CGFloat

            }

        }

 

        return CGSize(width: width, height: height)

    }

}