//使用方法：

YBImgPickerViewController * next = [[YBImgPickerViewController alloc]initWithChoosenImgDic:choosenDic delegate:self];
[next showInViewContrller:self];
//直接创建，调用显示方法

//回调：

• (void)YBImagePickerDidFinishWithImages:(NSDictionary *)choosenImgDic { choosenDic = choosenImgDic.mutableCopy; //返回的是选中的图片的dictionary，key为asset，value为uiimage }