I made ionic based mobile application.
I used cordova-plugin-image-picker plugin for uploading image.
I used com-sarriaroman-photoviewer plugin for viewing image.
Both plugins are working in andorid.
But they are not working in iPhone 6 and iPhone 6 SE (iOS 10+).
I don't know the reason why such happens.
finally i solved it. just add below tag to your index.html. it solved my issue.
if do you have same tag please remove it and replace it with this tag
<meta http-equiv="Content-Security-Policy" content="default-src gap://ready *; style-src 'self' 'unsafe-inline'; script-src 'self' https://maps.googleapis.com https://*.googleapis.com 'unsafe-inline' 'unsafe-eval'">