如果使用Xcode制作iOS计算器，我该如何添加小数点按钮？ [英] If using Xcode to make an iOS calculator, how would I add a decimal button?

问题描述

如何添加小数点按钮，所以我不需要做整数？如果我想要任何十进制数字，如1.2或100.4或3.0或类似的东西，我如何将它添加到我正在制作的计算器？

How to add a decimal button so I don't have to do whole numbers? If i wanted any decimal number like 1.2 or 100.4 or 3.0 or anything like that, how would I add it to the calculator I'm making?

推荐答案

你没有在你的问题中给我很多信息。其他按钮如何工作？

You're not giving me much information in your question. How do the other buttons work?

如果我正在制作计算器，我会在顶部显示一个标签，显示当前的读数。按下数字按钮，我会用最后的数字更新标签。

If I was making a calculator I would have a label at the top showing the current reading. On press of a number button I would update the label with the number at the end.

对于小数点按钮，你只需添加一个。到标签的末尾。您可能希望拥有一个全局变量 BOOL hasDecimalPlace 并将其设置为true，以便知道是否已存在小数位。只需记住在清除视图或进行计算或类似操作时再将其设置为false。

For a decimal button you just add a . to the end of the label. You might want to have a global variable BOOL hasDecimalPlace and set it to true so you know if there is already a decimal place. Just remember to set it to false again when you clear the view or do a calculation or similar.

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