XHImageViewer 介绍
XHImageViewer 实现图片浏览功能，点击图片，开启图片全屏浏览模式。支持下载和显示网络图片。
使用方法：
#import "XHImageViewer.h" XHImageViewer *imageViewer = [[XHImageViewer alloc] init]; imageViewer.delegate = self; [imageViewer showWithImageViews:_imageViews selectedView:imageView]; _imageViews is mutiple imageViews(subClass UIImageView or UIImageView) imageView is user touch imageView to selectedImageView