Is there a way to lock apps on the iPhone?

[iMore Question]

Is this ryt that no one can lock app i phone 5 like app whts alp or imo???? In android app lock is so easy tk this so no kn ecan see jr personal chats of whts appI dont think so apple is secured then

 

[Just_Me_D]

Why lock an app when you can lock the entire device? Anyway, apps like Dropbox can be passcode locked, but I'm unaware of a way to lock apps or folders natively in iOS. Sorry.