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计算器中只有一个逗号/点！适用于 iPhone 的 Objective-C

发布于 2024-10-18 06:28:03 字数 110 浏览 3 评论 0原文

我正在为 iPhone 建立一个 CalculatorApp，我只需要结束一件事，那就是浮点！

与普通计算器一样，我需要做一些事情，以便只允许一个“。” 。

你们能帮帮我吗？

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⊕婉儿 2024-10-25 06:28:03

您有几种方法可以选择，例如 NSString 的 rangeOfString 方法，例如

#define FLOATING_POINT_STRING @"."; // set this to @"." or @"," according to the floating point type you want to use
float calculatorText = 45.194; // set this to whatever the label says, or you can skip the float => string conversion as shown below
NSString *text = [NSString stringWithFormat:@"%f", calculatorText];

if ([text rangeOfString:FLOATING_POINT_STRING].location != NSNotFound)
{
    // do nothing, there is a floating point
}
else
{ 
// append FLOATING_POINT_STRING to the label
}

祝你好运;)

you have a few ways to go, such as, NSString's rangeOfString method, e.g.

#define FLOATING_POINT_STRING @"."; // set this to @"." or @"," according to the floating point type you want to use
float calculatorText = 45.194; // set this to whatever the label says, or you can skip the float => string conversion as shown below
NSString *text = [NSString stringWithFormat:@"%f", calculatorText];

if ([text rangeOfString:FLOATING_POINT_STRING].location != NSNotFound)
{
    // do nothing, there is a floating point
}
else
{ 
// append FLOATING_POINT_STRING to the label
}

Good luck ;)

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橪书 2024-10-25 06:28:03

您是否使用 UIButton 作为小数点按钮？如果是这样，您可以在按下它后立即将其禁用。当然，当按下“清除”或“等于”或其他任何按钮时重新启用它：

[buttonDecimalPoint setEnabled: NO];

Are you using a UIButton for the decimal point button? If so, you could simply disable it as soon as it is pressed. And then of course, re-enable it when "clear" or "equals" or whatever is pressed: