从Unichars来回转换显示字符的最佳方法？目标C [英] Best way to convert Back and forth from Unichars to display characters? Objective C

问题描述

我正在试着了解Unichars。 Unichars来自Ascii，似乎是一个更高级和更复杂的字符代码库。现在，我正在构建一个简单的应用程序，该应用程序将接受将表示Unicode的字符串\\\ ####，这将导致我的第一个问题。什么是格式化Unicode的最佳方法，搜索了这么久以后，我觉得我已经看到了很多方法来做到这一点。或者，也许我还没有最好的概念。

让我们拿回收符号为例。 U + 267B

我想让我的程序把它转换成实际的符号，并显示出来吗？

然后id喜欢阅读任何符号，并将其转换回Unicode？

我期待这是非常简单的，但我想教我这个自我。 ..

谢谢OverFlow !!!!

ps。 MacBook Pro的命令是什么，以输入Unicode，并有相应的符号出现？

解决方案

这应该为你工作： / p>

  NSString * text = inputView.text; //例如\\\♻
 NSLog（@％@，text）; 
 //输出：\\\♻ 
 NSData * d = [text dataUsingEncoding：NSASCIIStringEncoding]; 
 NSString *转换= [[NSString分配] initWithData：d编码：NSNonLossyASCIIStringEncoding]; 
 NSLog（@％@，转换）; 
 //输出：♻
 outputView.text =转换; 
  

它使用 NSNonLossyASCIIStringEncoding 解码\\ \\ uNNNN到相应的Unicode字符。

要在另一个方向（从♻到\\\♻）进行转换，您只需要
在上面的代码中交换 NSASCIIStringEncoding 和 NSNonLossyASCIIStringEncoding
。

$ b $正如你正确地注意到的那样，反向不能编码在<= U + 00FF范围内的字符
。下面的代码也会转换这些字符：

  NSString * text = inputView.text; //例如♻A
 NSLog（@％@，text）; 
 //输出：♻A
 NSMutableString * converted = [NSMutableString string]; 
 for（NSInteger i = 0; i< [text length]; i ++）{
 unichar c = [text characterAtIndex：i]; 
 [转换appendFormat：@\\％04X，c]; 
} 
 NSLog（@％@，转换）; 
 //输出：\\\♻\\\A 
 outputView.text =转换; 
  

I am trying to understand Unichars. Coming from Ascii, Unichars just seems like a more advanced and complex library of character codes. Now I am building a simple application that will accept a string "\u####" that will represent the Unicode, that leads me to my first problem. what is the best way to format Unicode, after searching the web for so long, I feel like I have seen many ways to do it. Or maybe I just don't have the best concept of it yet.

Lets take the recycle symbol for example. U+267B

I would like my Program to convert that into the actual symbol, and display it?

Then id like to read in any symbol and convert that back into Unicode?

I am expecting this to be very simple, but I am trying to teach this to my self...

Thanks OverFlow!!!!

ps. Whats the command on a MacBook Pro to type in Unicode and have the corresponding symbol appear?

解决方案

This should work for you:

NSString *text = inputView.text; // For example "\u267B"
NSLog(@"%@", text);
// Output: \u267B
NSData *d = [text dataUsingEncoding:NSASCIIStringEncoding];
NSString *converted = [[NSString alloc] initWithData:d encoding:NSNonLossyASCIIStringEncoding];
NSLog (@"%@", converted);
// Output: ♻
outputView.text = converted;

It uses the fact that NSNonLossyASCIIStringEncoding decodes \uNNNN to the corresponding Unicode character.

To convert in the other direction (from "♻" to "\u267B"), you just have to exchange NSASCIIStringEncoding and NSNonLossyASCIIStringEncoding in the above code.

UPDATE: As you correctly noticed, the "reverse direction" does not encode characters in the range <= U+00FF. The following code converts these characters as well:

NSString *text = inputView.text; // For example "♻A"
NSLog(@"%@", text);
// Output: ♻A
NSMutableString *converted = [NSMutableString string];
for (NSInteger i = 0; i < [text length]; i++) {
    unichar c = [text characterAtIndex:i];
    [converted appendFormat:@"\\u%04X", c];
}
NSLog (@"%@", converted);
// Output: \u267B\u0041
outputView.text = converted;

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