Swifterswift: Cannot subscript a value of type 'String' with an index of type '(safe: Range<Int>)'

[ningkexin]

swift 5.0

SwifterSwift (5.0.0)

        let str = "hello world";
        let str1 = str[safe: 0..<3]

The above code will prompt an error. I will rewrite an extension and write these functions. It is not. Why?

[RomanPodymov]

Hello @ningkexin
This code works for me in Xcode 10.2.1 and I also use SwifterSwift 5.0.0. What Xcode version are you using?

[LucianoPAlmeida]

Hey @ningkexin @RomanPodymov :))
@ningkexin Can you elaborate more on what error it is giving you, so we can check?

[ningkexin]

@RomanPodymov I also use Version 10.2.1 (10E1001)

[ningkexin]

@LucianoPAlmeida I don't know why this is causing the problem, but I can probably provide my usage environment. I am using it under the old project (Objective-C). In addition, I used swift4.2 before. I didn't use this POD at first. I just tried the extension of String, which didn't cause any problems during the use. Then I tried the swift5.0 version yesterday, and this problem has appeared!

[ningkexin]

Xcode also indexes two definitions, but I commented out that my extension is not compiled.

[LucianoPAlmeida]

This duplication is probably because Xcode didn’t reindexed after you comment. But my question is more about the error message. What the error log the compiler is outputting?

_{Sent with GitHawk}

[ningkexin]

@LucianoPAlmeida

• Please see the error message below. I have already "Clean Build Folder" before this.
  

[guykogus]

Sorry if this is an obvious question, but have you called import SwifterSwift?

[ningkexin]

Oh, it’s stupid, I solved my problem!