Anyway easy way to find Swift API signature from Obj-C version?

Using Swift
1

This post refers to String method stringByPaddingToLength:withString:startingAtIndex:, I couldn't figure out how to call this with Swift syntax. For things like this, is there any simple way to get the Swift version of the method signature?

2

Usually you can select the language from the drop down, but if it’s not supported then I’m not sure if there’s a way other than searching for it manually. For the API you mentioned above, I believe the Swift equivalent is Apple Developer Documentation

1 Like
3

One trick I use is to do the wrong thing and then let the compiler suggest a fix-it. For example, if you write this in Xcode:

let s: NSString = ""
s.stringByPaddingToLength(_: 0, withString: "", startingAtIndex: 0)

you’ll get this error:

…/main.swift:14:7: error: 'stringByPaddingToLength(_:withString:startingAtIndex:)' has been renamed to 'padding(toLength:withPad:startingAt:)'
    s.stringByPaddingToLength(_: 0, withString: "", startingAtIndex: 0)
      ^~~~~~~~~~~~~~~~~~~~~~~       ~~~~~~~~~~      ~~~~~~~~~~~~~~~
      padding                    toLength:  withPad startingAt

and away you go!

Share and Enjoy

Quinn “The Eskimo!” @ DTS @ Apple

2 Likes