如何格式化数字以使其始终有一个小数位？

发布于 2024-09-25 00:13:46 字数 682 浏览 0 评论 0原文

例如，我的浮点值如下：

0.2 1.5 2.0 3.0 10.0 52.5 60.0

无论如何，我真的想要一位小数。即使数字正好是 1，我希望它显示为 1.0

我尝试像这样设置 NSNumberFormatter，但它不起作用：

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setAlwaysShowsDecimalSeparator:NO];
[formatter setAllowsFloats:YES];
[formatter setFormatterBehavior:NSNumberFormatterBehavior10_4];
[formatter setMinimumFractionDigits:1];

[formatter setUsesSignificantDigits:YES];
[formatter setMinimumSignificantDigits:2];

[formatter setNumberStyle:kCFNumberFormatterDecimalStyle];

它显示 0.2、5.0、5.5、9.0，

但是当它达到 10 时，它将显示 10, 10.3, 11, 11.9, 15, ... 等等。这是 NSNumberFormatter 无法做到的吗？

原文

For example, I have float values like:

0.2
1.5
2.0
3.0
10.0
52.5
60.0

Under any circumstances, I really want one fractional digit. Even if the number is exactly 1, i want it to be displayed as 1.0

I tried to set up an NSNumberFormatter like this, but it doesn't work:

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setAlwaysShowsDecimalSeparator:NO];
[formatter setAllowsFloats:YES];
[formatter setFormatterBehavior:NSNumberFormatterBehavior10_4];
[formatter setMinimumFractionDigits:1];

[formatter setUsesSignificantDigits:YES];
[formatter setMinimumSignificantDigits:2];

[formatter setNumberStyle:kCFNumberFormatterDecimalStyle];

It shows 0.2, 5.0, 5.5, 9.0,

but when it reaches 10, it would show 10, 10.3, 11, 11.9, 15, ... and so on.
Is this something NSNumberFormatter can't do?

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怪我鬧 2024-10-02 00:13:46

setAlwaysShowsDecimalSeparator：
控制接收器是否始终显示小数分隔符，即使对于整数也是如此。

尝试将其设置为 YES

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凡间太子 2024-10-02 00:13:46

试试这个？

NSString * f= [NSString stringWithFormat:@"%.01f",(float)10];

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﹏半生如梦愿梦如真 2024-10-02 00:13:46

我无法使用 madmi3 解决方案，因为我需要动态设置 NSNumberFormatter 的区域设置。

所以最终使用了以下解决方案：

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
formatter.alwaysShowsDecimalSeparator = YES; // This will produce results like 10. for intergers
formatter.maximumFractionDigits = 1;
formatter.locale = [NSLocale localeWithLocaleIdentifier:@"pt"]; // I get this locale dinamically

NSString *formattedNumber = [formatter stringFromNumber:[NSNumber numberWithInteger:10]];

//Check this formattedNumber is ending with the separator
//If so, then append one more 0.
if ([formattedNumber hasSuffix:[formatter.locale objectForKey:NSLocaleDecimalSeparator]])
{
    formattedNumber = [formattedNumber stringByAppendingString:@"0"];
}

NSLog(@"%@", formattedNumber);

I could not use madmi3 solution's because I need to set the locale of the NSNumberFormatter dynamically.

So ended up using the following solution:

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
formatter.alwaysShowsDecimalSeparator = YES; // This will produce results like 10. for intergers
formatter.maximumFractionDigits = 1;
formatter.locale = [NSLocale localeWithLocaleIdentifier:@"pt"]; // I get this locale dinamically

NSString *formattedNumber = [formatter stringFromNumber:[NSNumber numberWithInteger:10]];

//Check this formattedNumber is ending with the separator
//If so, then append one more 0.
if ([formattedNumber hasSuffix:[formatter.locale objectForKey:NSLocaleDecimalSeparator]])
{
    formattedNumber = [formattedNumber stringByAppendingString:@"0"];
}

NSLog(@"%@", formattedNumber);

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