Safe Swipe solves the problem of passing your phone to another and then they swipe through your photos. Photo selection is locked behind Face ID/passcode, so only photos users select are visible to others. They can swipe away without the worry of coming across an undesired photo.
1.) Startup app.
2.) Click "Choose Photos". Face ID approval may prompt.
3.) Enter Face ID/passcode.
4.) Tap photos to select. Click "Add".
5.) Photos are displayed.
6.) Tap a photo to open in Individual Photo Viewer.
7.) Ping Zoom to zoom-in. Tap-drag to pan.
8.) Double-tap to zoom back out to normal.
9.) Tap back arrow to return to photo grid-view.
10.) Click "X" button to clear photos from grid-view.