如何解决scanLocation在iOS 13.0中被废弃的问题？

当Swift新项目或者是老项目升级出现了Scanner 'scanLocation' was deprecated in iOS 13.0的问题，“scanLocation”在iOS 13.0中被废弃了。

scanLocation Warning的代码

            convenience init(hexString: String) {
                    let scanner = Scanner(string: hexString)
                    scanner.scanLocation = 0   // 'scanLocation' was deprecated in iOS 13.0
                    var rgbValue: UInt64 = 0
                    scanner.scanHexInt64(&rgbValue)
            }
            

解决办法：

您可以使用currentIndex而不是scanLocation

scanner.currentIndex = hexString.startIndex
            

最终的代码如下：

            convenience init(hexString: String) {
                    let scanner = Scanner(string: hexString)

                    if #available(iOS 13.0, *) {
                        scanner.currentIndex = hexString.startIndex
                    } else {
                        scanner.scanLocation = 0
                    }

                    var rgbValue: UInt64 = 0
                    scanner.scanHexInt64(&rgbValue)
            }