为什么 rand(variable) 会停止我的 Shoes 程序的执行？
我是鞋子的新手，我正在尝试创建一个简单的骰子滚筒，允许用户通过输入面数来选择自定义尺寸的骰子。我的代码如下：
Shoes.app :width => 500, :height => 300 do
flow do
para "Sides: "
@sides = edit_line
end
flow do
button "Roll!" do
@total = 1 + rand(sides)
alert @total
end
end
end
我在编辑行中输入一个数字，单击按钮，但没有任何反应。
如果我将 @total = rand(sides) 替换为 @total = rand(20)，程序执行得很好，但当然只会产生 1-20 之间的随机数。
我尝试了像 rand(@sides) 这样的变体，但没有成功。
我用纯 Ruby 设计了一个类似的程序，它使用 rand(sides) 没有任何问题，但如果我尝试在 Shoes 中这样做，它什么也不做。
I am brand new to Shoes, and am trying to create a simple dice roller that allows the user to choose a custom-sized die by inputting the number of sides. My code is as follows:
Shoes.app :width => 500, :height => 300 do
flow do
para "Sides: "
@sides = edit_line
end
flow do
button "Roll!" do
@total = 1 + rand(sides)
alert @total
end
end
end
I input a number in the edit line, click the button, and nothing happens.
If I replace @total = rand(sides) with @total = rand(20), the program executes just fine, but of course only produces random numbers from 1-20.
I tried variations like rand(@sides), to no avail.
I designed a similar program in just plain Ruby which uses rand(sides) without a problem, but if I try to do it in Shoes, it does nothing.
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你有几个错误。首先，使用
@sides，而不是sides。这样，您就可以引用之前设置的同一变量。其次，
@sides的类型是Shoes::EditLine。这很好，因为您需要动态查找文本。当您需要@sides的文本时，调用@sides.text，它返回一个String。当然，在这种情况下，您需要将其转换为适合输入到rand的整数，因此您将使用@sides.text.to_i。（当然，标准的不信任用户警告适用。实际上，您需要检查输入是否无效并执行一些有用的操作。）
长话短说，替换
@total = 1 + rand (sides)与@total = 1 + rand(@sides.text.to_i)就可以了。You have a couple mistakes. First, use
@sides, notsides. That way, you're referencing the same variable you set earlier.Second, the type of
@sidesisShoes::EditLine. Which is good, since you need to look up the text dynamically. When you want the text of@sides, call@sides.text, which returns aString. Of course, in this context, you'll need to convert that to an integer suitable for input torand, so you'll use@sides.text.to_i.(Of course, the standard don't-trust-users caveats apply. In reality, you'll want to check your input for invalid input and do something useful.)
Long story short, replace
@total = 1 + rand(sides)with@total = 1 + rand(@sides.text.to_i)and you'll be good.edit_line返回一个 String 对象。您需要先使用@sides = edit_line.to_i将其转换为整数edit_linereturns a String object. You need to convert it to integer first with@sides = edit_line.to_i