如何检测NSString是否包含特定字符？

Question

我有一个NSString对象,例如: - ($ 45,0000)

现在我想找到这个字符串是否包含()

我怎样才能做到这一点？

Answer 1

你试图找到它是否包含至少一个(或)？你可以使用-rangeOfCharacterFromSet::

NSCharacterSet *cset = [NSCharacterSet characterSetWithCharactersInString:@"()"];
NSRange range = [mystr rangeOfCharacterFromSet:cset];
if (range.location == NSNotFound) {
    // no ( or ) in the string
} else {
    // ( or ) are present
}

Answer 2

如果给定的字符串包含给定的char,则以下方法将返回Yes

-(BOOL)doesString:(NSString *)string containCharacter:(char)character
{
    return [string rangeOfString:[NSString stringWithFormat:@"%c",character]].location != NSNotFound;
}

您可以按如下方式使用它:

 NSString *s = @"abcdefg";

    if ([self doesString:s containCharacter:'a'])
        NSLog(@"'a' found");
    else
        NSLog(@"No 'a' found");


    if ([self doesString:s containCharacter:'h'])
        NSLog(@"'h' found");
    else
        NSLog(@"No 'h' found");

输出:

2013-01-11 11:15:03.830 CharFinder [17539:c07]'a'发现

2013-01-11 11:15:03.831 CharFinder [17539:c07]没有找到'h'