ios - 无法将不可变值作为 inout 参数传递

Question

在 Objective-C 中

CGPDFArrayRef array;

这很好用:而在 Swift 中它应该是这样，

var array:CGPDFArrayRef

但在下一行传递时会出现此错误:

var success = CGPDFScannerPopArray(inScanner, &array)

Cannot pass immutable value as inout argument: implicit conversion from 'CGPDFArrayRef' to 'CGPDFArrayRef?' requires a temporary.

Answer 1

我通过像这样传递 array 来修复它:

var success = CGPDFScannerPopArray(inScanner, UnsafeMutablePointer(array))