####WSImagePicker 高性能多选图片库，类似于微信发布朋友圈中 ‘获取相册及拍照’模块
获取相册照片部分可以多选，加载速度快，采用JFImagePickerController https://github.com/johnil/JFImagePickerController并在此基础上增加图片数量选取限制； 点击图片显示大图，并能进行双击放大缩小，双指缩放、删除等操作；
####How to user #####Import
#import "WSImagePickerView.h"
#####parameter settings
WSImagePickerConfig *config = [WSImagePickerConfig new];
config.itemSize = CGSizeMake(70, 70);
config.photosMaxCount = 9;
#####create pickerView
WSImagePickerView *pickerView = [[WSImagePickerView alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, 0) config:config];
//Height changed with photo selection
__weak typeof(self) weakSelf = self;
pickerView.viewHeightChanged = ^(CGFloat height) {
weakSelf.photoViewHieghtConstraint.constant = height;
[weakSelf.view setNeedsLayout];
[weakSelf.view layoutIfNeeded];
};
pickerView.navigationController = self.navigationController;
[self.photoView addSubview:pickerView];
self.pickerView = pickerView;
//refresh superview height
[pickerView refreshImagePickerViewWithPhotoArray:nil];
#####get photos NSArray *array = [self.pickerView getPhotos];