iphone - iPhone iOS 如何以编程方式检查 ✭ ♦ 之类的字符（以及该集合中的其他字符）？

Question

我知道 ✭star 和 ♦ diamond 都来自 ASCII 扩展字符集。但是 iOS 上是否有一些可用的 NScharacterSet 可以用来以编程方式检查这些字符？

Answer 1

This can be done with the NSString object method: rangeOfCharacterFromSet. It returns NSRange object.

From that,

Eg.:

NSCharacterSet *charSet = [[NSCharacterSet characterSetWithCharactersInString:@"0123456789"] invertedSet];

NSString *string = @"Stach✭Overflow";

NSRange range = [string rangeOfCharacterFromSet:charSet];
if(range.location != NSNotFound) {
// one of those characters is exists in the string.
}else{
//no specifiedcharacter not found.
}

Answer 2

您可以使用字符集显示这些符号ISO 8859-1 or UTF-8.

 [ ★ ] star solid [ number: ★]


 [ ♦ ] black diamond suit [name: ♦] [number: ♦]