30使用guard改善条件判断

原创已于 2022-07-23 10:29:14 修改 · 79 阅读

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于 2022-07-23 10:19:53 首次发布

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该博客介绍了如何使用Swift编写一个函数checkIPAddress2，用于检查IP地址是否符合规范，包括四个部分且每个部分的值在0-255之间。通过示例展示了函数的调用结果和错误处理过程。

判断IP地址

func checkIPAddress2(ipAddr:String) ->(Int, String){
            let compoments = ipAddr.split(separator: ".")
            
            guard compoments.count == 4 else {
                return (100,"the ip address must has four compoments")
            }
            guard let first = Int(compoments[0]),first >= 0 && first < 256 else{
                return (1,"this first compoment is wrong")
            }
            guard let second = Int(compoments[1]),second >= 0 && second < 256 else{
                return (2,"this second compoment is wrong")
            }
            guard let third = Int(compoments[2]),third >= 0 && third < 256 else{
                return (3,"this third compoment is wrong")
            }
            guard let fourth = Int(compoments[3]),fourth >= 0 && fourth < 256 else{
                return (4,"this fourth compoment is wrong")
            }
            return(0,"")
        }
        print(checkIPAddress2(ipAddr: "127.0.-1.0"))

print:(3, "this third compoment is wrong")