How to fix “SWIFT_VERSION '3.0' is unsupported, supported versions are: 4.0, 4.2, 5.0” error in Xcode 10.2?

Question

I\'m trying to run downloaded from app, try to open in Xcode and have an error:

\" Showing Recent Messages
:-1: SWIFT_VERSION \'3.0\' is unsu

Answer 1

1. Check this out:
   1. Click on Project name
   2. Click target
   3. Click on Build setting
   4. At the Swift Language Version: Choose Swift 4

Answer 2

1. Select project
2. Select Build SettingTab
3. Select Swift Compiler language Option

Answer 3

1) change pod's version on podfile (because library wrote old swift version )

2) "pod install" on terminal