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)

}

}