图片选择器 使用photokit框架写的imagePicker 相比较之前的assetLibrary框架具有更强的功能
HJImagePicker 是为了应对图片多选场景开发的，但是在定制时候也考虑到单选情况 /** imagePicker image selcted type
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HJImagePickerTpyeSingleSelection: chose singel image
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HJImagePickerTypeMultiSelection: chose multi images / typedef NS_ENUM(NSInteger,HJImagePickerType){ /* chose singel image */ HJImagePickerTpyeSingleSelection = 0,
/** chose multi images */ HJImagePickerTypeMultiSelection = 1,
};