This is based on https://github.com/ooper-shlab/LazyTableImages1.5-Swift, The only change is it is using NSURLSession to download images rather than NSURLConnection. It is not tested in all cases, If you find any issue, then please post it. will try to fix.
Translated by OOPer in cooperation with shlab.jp, on 2014/10/3.
Based on https://developer.apple.com/library/ios/samplecode/LazyTableImages/Introduction/Intro.html#//apple_ref/doc/uid/DTS40009394 2014-10-02.
As this is a line-by-line translation from the original sample code, "redistribute the Apple Software in its entirety and without modifications" would apply. See license terms in each file . Some faults caused by my translation may exist. Not all features tested. You should not contact to Apple or SHLab(jp) about any faults caused by my translation.
=========================================================================== BUILD REQUIREMENTS:
Xcode 6.3, iOS SDK 8.3
=========================================================================== RUNTIME REQUIREMENTS:
iOS 7.0 or later