Apple doesn't have an authority technique for separately locking touchy applications like Photos with a password, however fortunately there's a workaround that was presented in iOS 12 with Screen Time. 

In the event that you truly need to ensure one of your applications is distant, you can utilize Apple's App Limits element to do as such. Here's the ticket: 

Open up the Settings application. 

Pick "Screen Time." 

Ensure Screen Time is empowered and a Screen Time password is set. 

Tap on "Gadgets" in the upper left corner and select your present gadget. On the off chance that you don't have various gadgets, simply tap on the name of your gadget at the top. 

Pick an application you need to lock and tap it. On the off chance that the application you need isn't recorded, pick any application. It's simply an entryway to get to more profound settings. 

Tap "Add Limit." 

From here, tap "Alter Apps" and add the wide range of various applications that you should lock. 

After you've chosen the entirety of the applications that you need to be locked, utilize the clock interface at the highest point of the showcase to choose a brief timeframe, similar to a moment, and afterward tap "Add." 

The new App Limit will adequately secure your chose applications, and in the event that you endeavor to tap on one of these locked applications, you will be needed to include your Screen Time password. 

Step by step instructions to Use a Locked App 


When you have App Limits set up to lock applications you need to be out of reach, you can tap on "Request More Time" to get to the application. You'll have to place in your password, and afterward once you do, you can open it for 15 minutes, 60 minutes, or the remainder of the day. It's absolutely impossible to quickly lock it again in the wake of endorsing it for 15 minutes without re-trying the whole App Limit arrangement, so remember that. 

Constraints


You can password lock any application on your telephone with the exception of the Phone application. There is no choice to wind down admittance to the Phone application by any means. For applications like Messages or FaceTime, you need to alter the "Consistently Allowed" segment of Screen Time to eliminate them for the cutoff to be empowered. 

You can handicap admittance to Messages and ‌FaceTime‌, however you probably won't have any desire to. At the point when admittance to Messages is incapacitated by means of App Limits, gadgets utilizing iCloud for Screen Time can't send or get messages during personal time. You're likewise not ready to see warnings for applications that are locked, remember to the point that when securing informal communication applications. 

An Alternate Locking Method


Assuming you need to secure most or the entirety of your applications, you can follow these means: 

Open the Settings app.Choose "Screen Time." 

Ensure Screen Time is empowered and a password is set. 

Select "Application Limits." 

Tap "Add Limit." 

Select "All Apps and Categories." 

Pick a brief timeframe from the clock interface, like a little while. 

Tap "Add." 

Picking "All Apps and Categories" locks the entirety of the applications on your iPhone aside from a couple. You can limit that down a bit by choosing only a classification of applications to lock, for example, "Person to person communication," and you can open individual applications by going to "Consistently Allowed" in the primary Screen Time interface, choosing "All Apps and Categories" and unchecking, the applications that you need to make available.