iOS原生组件拍照得到的图片怎么传到uniapp中?

uniapp集成了原生组件,原生组件拍照后得到了Uiimage,我把uiimage,base64编码后,在uniapp中不显示,```javascript

贴上iOS代码:  

//base64方法  

- (NSString *)imageToString:(UIImage *)image  

{  

    NSData *imagedata = UIImagePNGRepresentation(image);  

    NSString *image64 = [imagedata base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithCarriageReturn];  

    return image64;  

}