https://developer.apple.com/library/content/samplecode/LargeImageDownsizing/Introduction/Intro.html
附:sdwebimage 使用中遇到的下载大图问题:http://www.cocoachina.com/ios/20160920/17602.html
https://developer.apple.com/library/content/samplecode/LargeImageDownsizing/Introduction/Intro.html
附:sdwebimage 使用中遇到的下载大图问题:http://www.cocoachina.com/ios/20160920/17602.html