一款简单的图片浏览器 用法示例：
NSMutableArray *photos = [NSMutableArray array];
for (int i=0; i<self.imageViews.count; i++) {
UIImageView *child = self.imageViews[i];
//1.创建photo模型
JLPhoto *photo = [[JLPhoto alloc] init];
//2.原始imageView
photo.sourceImageView = child;
//3.要放大图片的url
photo.bigImgUrl = self.bigImgUrls[i];
//标志
photo.tag = i;
[photos addObject:photo];
}
//1.创建图片浏览器
JLPhotoBrowser *photoBrowser = [[JLPhotoBrowser alloc] init];
//2.获取photo数组
photoBrowser.photos = photos;
//3.当前要显示的图片
photoBrowser.currentIndex = (int)tap.view.tag;
[photoBrowser show];