trampoline.swift

func executeOnMain() {
  if !Thread.isMainThread {
    DispatchQueue.main.async(execute: {() -> Void in
      executeOnMain()
    })
    return
  }
  
  // do something
}

doesn't this need a return in the if block?
Otherwise, in case of code executing outside the main thread, the // do something part will be executed 2 times.

updated. sry it took so long

It is still wrong. It should read:

func executeOnMain() {
  if !Thread.isMainThread {
    DispatchQueue.main.async(execute: {() -> Void in
      executeOnMain()
    })
    return
  }
  
  // do something
}