Question

我正在制作一个命令行应用程序来学习swift和OOP编程。我的代码在Xcode调试器中工作正常（我看到输入和输出就好了），但是当我存档并导出我的项目时，由于某种原因我无法看到print函数的输出。

这是我的意思的一个例子。

在Xcode中调试：

Welcome to the login system
-----------------------------

Add a user    [0]
List users    [1]
Delete user   [2]
Quit System   [3]
-------------------------------
Option: 0
Username: User
Password: Pass
User: User sucsessully added to the system
Welcome to the login system
-----------------------------

Add a user    [0]
List users    [1]
Delete user   [2]
Quit System   [3]
-------------------------------
Option: 1
User
Welcome to the login system
-----------------------------

Add a user    [0]
List users    [1]
Delete user   [2]
Quit System   [3]
-------------------------------
Option: 0
Username: User2
Password: Pass
User: User2 sucsessully added to the system
Welcome to the login system
-----------------------------

Add a user    [0]
List users    [1]
Delete user   [2]
Quit System   [3]
-------------------------------
Option: 1
User
User2
Welcome to the login system
-----------------------------

Add a user    [0]
List users    [1]
Delete user   [2]
Quit System   [3]
-------------------------------
Option: 2
Delete user: User2
Welcome to the login system
-----------------------------

Add a user    [0]
List users    [1]
Delete user   [2]
Quit System   [3]
-------------------------------
Option: 1
User
Welcome to the login system
-----------------------------

Add a user    [0]
List users    [1]
Delete user   [2]
Quit System   [3]
-------------------------------
Option: 3

Program ended with exit code: 0

现在，当我在终端中运行已存档的导出命令行应用程序时：

Welcome to the login system
-----------------------------

Add a user    [0]
List users    [1]
Delete user   [2]
Quit System   [3]
-------------------------------
0
User
Pass
Option: Username: Password: User: User sucsessully added to the system
Welcome to the login system
-----------------------------

Add a user    [0]
List users    [1]
Delete user   [2]
Quit System   [3]
-------------------------------
3

如您所见，程序会记录我的输入，有时会打印。

我试图从terminator: ""函数中删除print以查看是否存在问题并且打印得很好。这似乎是终结者参数的问题。我还尝试将""替换为" "作为终结符参数，但它仍然不起作用。

为什么我无法使用terminator参数输出到控制台？

以下是代码：

import Foundation

var running:Bool = true
let loginSystem = LoginSystem()


repeat
{
print("Welcome to the login system")
print("-----------------------------\n")
print("Add a user    [0]")
print("List users    [1]")
print("Delete user   [2]")
print("Quit System   [3]")
print("-------------------------------")
printToConsole("Option: ")
let option = input().intValue

//Add a user
if option == 0
{
    print("Username: ", terminator: " ")
    let username = input()
    print("Password: ", terminator: " ")
    let password = input()
    print("User: \(username) sucsessully added to the system")
    loginSystem.addUser(username, password: password, uid: 0, guid: 0)

//List users
} else if option == 1 {
    let users = loginSystem.getUsers()
    printArray(users)

//Delete user
} else if option == 2 {
    printToConsole("Delete user: ")
    let user = input()
    loginSystem.deleteUser(user)

//Quit
} else if option == 3 {
    running = false
}
clear()
} while running

print("")

printArray（theArray：[AnyObject]）：

func printArray(theArray:[AnyObject])
{
    for item in theArray
    {
        print("\(item)")
    }
}

清晰（）

func clear()
{
    let clearCommand = "if [ -n \"$STY\" ]; then clear; fi"
    system(clearCommand)
}

输入（）

func input() -> String {
    let keyboard = NSFileHandle.fileHandleWithStandardInput()
    let inputData = keyboard.availableData
    let strData = NSString(data: inputData, encoding: NSUTF8StringEncoding)!
    return strData.stringByTrimmingCharactersInSet(NSCharacterSet.newlineCharacterSet())
}

INTVAL

extension String
{
    var intValue:Int
    {
        return Int(self)!
    }
}

Answer 1

尝试

repeat 
{
fflush(stdout)
print("Welcome to the login system")

Swift无法使用终结器参数

1 个答案: