string - "set foo to text returned of"代表数字吗？

Question

我知道你可以将 foo 设置为(显示对话框“Dialog”默认答案“默认”)返回的文本。 我已经尝试了从 set foo to number returned of 或 set foo to integer returned of 的所有方法，但我似乎找不到用于返回数字的关键字。有什么帮助吗？

Answer 1

您需要获取返回的文本，然后将其强制转换为整数:

set foo to (text returned of (display dialog "Enter a number" default answer "42")) as integer

或者，拆开更能说明的是:

display dialog "Enter a number" default answer "42"
set foo to text returned of the result
set foo to foo as integer

我会把它分开，这样你就可以在强制转换周围包裹一个 try block ，以防它不是数字。

set foo to text returned of (display dialog "Enter a number" default answer "42")
try
    set foo to foo as integer
on error err
    set foo to 0
end

并且，这是一种反复询问的方法，直到他们提供有效的号码:

set msg to "Enter a number"
repeat
    set foo to text returned of (display dialog msg default answer "42")
    try
        set foo to foo as integer
        exit repeat
    on error err
        set msg to "That's not a valid number. Please enter a number."
    end try
end repeat
return foo