This iOS 12 trick allows you to passcode-protect apps

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First, set up a Screen Time passcode

If you don't already have one, you first need to set up a Screen Time passcode.
Go to Settings > Screen Time and click on Use Screen Time Passcode to set this up.
Hat-tip to Reddit and CNET for this tip.

Published: January 16, 2019 -- 10:13 GMT (02:13 PST)
Caption by: Adrian Kingsley-Hughes
Setting up the Screen Time passcode is simple

Setting up the Screen Time passcode is simple. Just enter a passcode, then reenter it to confirm and it's all set for you.

Published: January 16, 2019 -- 10:13 GMT (02:13 PST)
Caption by: Adrian Kingsley-Hughes
Next, set up App Limits

Now that you've got a Screen Time passcode set, it's time to set up App Limits.
From the Screen Time screen you were on previously, click on App Limits...

Published: January 16, 2019 -- 10:13 GMT (02:13 PST)
Caption by: Adrian Kingsley-Hughes
Add a new limit

... click on Add Limit...

Published: January 16, 2019 -- 10:13 GMT (02:13 PST)
Caption by: Adrian Kingsley-Hughes
Select All Apps & Categories

... next make sure that All Apps & Categories is selected and click Next...

Published: January 16, 2019 -- 10:13 GMT (02:13 PST)
Caption by: Adrian Kingsley-Hughes
Set the time limit to one minute

On the next screen set the Time to one minute, make sure Block at End of Limit is checked (it should already be selected, just be sure to not tap it by accident), and then click Add.
Now, any time you run an app, after one minute of use the user will have to enter a passcode and choose to allow the app to run for an extra 15 minutes, an hour, or all day.

Published: January 16, 2019 -- 10:13 GMT (02:13 PST)
Caption by: Adrian Kingsley-Hughes
Select apps you want to always allow to run

It might get annoying to have all apps restricted to being able to run for one minute, so you might want to whitelist some apps to allow them to bypass this limitation.
From the Screen Time screen, click on Always Allow...

Published: January 16, 2019 -- 10:13 GMT (02:13 PST)
Caption by: Adrian Kingsley-Hughes
Select whitelisted app

... and select the apps you want to whitelist from the list by clicking the green + symbol next to the name. You can also remove apps from the whitelist by clicking the red - symbol.
You can add to or customise this list at any point afterwards.

Published: January 16, 2019 -- 10:13 GMT (02:13 PST)
Caption by: Adrian Kingsley-Hughes

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iOS doesn't give a direct way to passcode access to apps, but by using the Screen Time feature we can pull off something that is workable. Bear in mind that this trick does have limitations, so you might want to read on before making changes to your iPhone. This trick only works for devices running iOS 12, and also works for iPads.