如何在UIlabel和UItextviews中显示表情符号和特殊字符？ [英] How to display the emoji and special characters in UIlabel and UItextviews?
问题描述
我正在尝试在各种项目中显示字符串，例如UIlabel，UItextview，Uitextfield等......我试图以这样的方式做这样的事情
I am trying to display a string in all sorts of items such as UIlabel,UItextview,Uitextfield etc.....I am trying to do like this in a manner like this
NSData *data1 = [title dataUsingEncoding:NSUTF8StringEncoding];
NSString *goodValue = [[NSString alloc] initWithData:data1 encoding:NSNonLossyASCIIStringEncoding];
label.text=goodvalue;
这对我来说有时会工作，但有时会为这个字符串返回null Youtube\\\�\\\�\\\�\\\�\\\�\\\�\\\�。任何人都可以指导我吗？
this is working sometimes for me ,but some times it returns null for the string like this "Youtube\ud83d\ude27\ud83d\ude2e\ud83d\ude2f\ud83d".Can anybody guide me on this?
推荐答案
表情符号字符位于unicode平面1中，因此需要16位以上才能表示代码点。因此，两个UTF8表示或一个UTF32表示。 Unicode实际上是一个21位系统，对于平面0字符（基本上除表情符号之外的所有东西）16位就足够了，我们可以使用16位。表情符号需要超过16位。
Emoji characters are in unicode plane 1 and thus require more than 16 bits to represent a code point. Thus two UTF8 representations or one UTF32 representation. Unicode is actually a 21-bit system and for plane 0 characters (basically everything except emoji) 16 bits is sufficient and we get by using 16 bits. Emoji need more than 16 bits.
Youtube\\\�\\\�\\\�\\\�\\\�\\\�\ ud83d。无效，它是utf16 unicode转义字符串的一部分，最后 \\\� 是表情符号字符的1/2。
"Youtube\ud83d\ude27\ud83d\ude2e\ud83d\ude2f\ud83d". is invalid, it is part of a utf16 unicode escaped string, the last \ud83d is 1/2 of an emoji character.
此外，为了使用转义字符\创建文字字符串，必须转义转义字符：\\。
Also, inorder to create a literal string with the escape character "\" the escape character must be escaped: "\\".
NSString *emojiEscaped = @"Youtube\\ud83d\\ude27\\ud83d\\ude2e\\ud83d\\ude2f";
NSData *emojiData = [emojiEscaped dataUsingEncoding:NSUTF8StringEncoding];
NSString *emojiString = [[NSString alloc] initWithData:emojiData encoding:NSNonLossyASCIIStringEncoding];
NSLog(@"emojiString: %@", emojiString);
NSLog输出：
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