使用 unicode 表示分数的 NSString

发布于 2024-11-27 17:23:24 字数 452 浏览 0 评论 0原文

我试图在我的 iPhone 应用程序中“很好地”显示分数。以前我一直在使用一个繁琐的 switch 语句，导致粗俗分数的硬编码 unicode 字符，但我已经了解了 unicode 分数斜杠字符，如果我理解正确的话，它应该意味着我可以创建一个字符串，如下所示

[NSString stringWithFormat:@"%i\u2044%i",numerator,denominator];

： “渲染器”将自动使用更小的上标分子和下标分母来打印它。然而，上面的代码只是给了我标准的 1/2 外观。我正在使用drawAtPoint 将字符串放在屏幕上。我已经尝试过 decomposedStringUsingCanonicalMapping 和 precomposedStringUsingCanonicalMapping 但说实话，文档让我迷失了。

这应该有效还是 NSString 绘图无法解决这个问题？

原文

I am trying to "nicely" display fractions in my iPhone application. Previously I have been using a tedious switch statement leading to hardcoded unicode characters for the vulgar fractions, but I have learnt about the unicode fraction slash character which, if I am understanding it correctly, should mean that I can create a string as follows:

[NSString stringWithFormat:@"%i\u2044%i",numerator,denominator];

And the "renderer" will automatically print it with a smaller, superscriped numerator and subscripted denominator. However, the above code just gives me the standard 1/2 appearance. I am using drawAtPoint to put the string on the screen. I have experimented with decomposedStringUsingCanonicalMapping and precomposedStringUsingCanonicalMapping but to be honest the documentation lost me.

Should this be working or does NSString drawing not cope with this?

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

紫南 2024-12-04 17:23:24

我碰巧只想将食谱的简单分数转换为 Unicode 粗俗分数。

您可以这样做：

CGFloat quantityValue = 0.25f;
NSString *quantity = nil;
if (quantityValue == 0.25f) {
    // 1/4
    const unichar quarter = 0xbc;
    quantity = [NSString stringWithCharacters:&quarter length:1];
} else if (quantityValue == 0.33f) {
    // 1/3
    const unichar third = 0x2153;
    quantity = [NSString stringWithCharacters:&third length:1];
} else if (quantityValue == 0.5f) {
    // 1/2
    const unichar half = 0xbd;
    quantity = [NSString stringWithCharacters:&half length:1];
} else if (quantityValue == 0.66f) {
    // 2/3
    const unichar twoThirds = 0x2154;
    quantity = [NSString stringWithCharacters:&twoThirds length:1];
} else if (quantityValue == 0.75f) {
    // 3/4
    const unichar threeQuarters = 0xbe;
    quantity = [NSString stringWithCharacters:&threeQuarters length:1];
}
NSLog(@"%@", quantity);

I happened to only want simple fractions for recipes to be converted to Unicode vulgar fractions.

Here is how you can do it:

CGFloat quantityValue = 0.25f;
NSString *quantity = nil;
if (quantityValue == 0.25f) {
    // 1/4
    const unichar quarter = 0xbc;
    quantity = [NSString stringWithCharacters:&quarter length:1];
} else if (quantityValue == 0.33f) {
    // 1/3
    const unichar third = 0x2153;
    quantity = [NSString stringWithCharacters:&third length:1];
} else if (quantityValue == 0.5f) {
    // 1/2
    const unichar half = 0xbd;
    quantity = [NSString stringWithCharacters:&half length:1];
} else if (quantityValue == 0.66f) {
    // 2/3
    const unichar twoThirds = 0x2154;
    quantity = [NSString stringWithCharacters:&twoThirds length:1];
} else if (quantityValue == 0.75f) {
    // 3/4
    const unichar threeQuarters = 0xbe;
    quantity = [NSString stringWithCharacters:&threeQuarters length:1];
}
NSLog(@"%@", quantity);

回复收藏 0 原文