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Passing UnsafeMutablePointer to Ref Object in a function in swift 3

I'm developing a pdf parser in swift, so i've stumbled upon the function CGPDFScannerPopString which takes a CGPDFScannerRef and an UnsafeMutablePointer?

The Objective C code looks like this:

CGPDFStringRef pdfString;
CGPDFScannerPopString(pdfScanner, &pdfString);

How do I write this in swift 3?

Solution

  • The type of the second parameter of CGPDFScannerPopString is UnsafeMutablePointer<CGPDFStringRef?>?. So, you need to prepare a variable of type CGPDFStringRef? and pass it as an inout argument:

    var pdfString: CGPDFStringRef?
_ = CGPDFScannerPopString(pdfScanner, &pdfString)