如何获取NSString的字符长度以及如何获取指定字符长度字符的字符串

来源：互联网发布：工业设计知乎编辑：程序博客网时间：2024/05/17 07:33

//首先先新建一个NSString的Category类

//获取NSString对应的字符长度

- (int)chineseLength{    int asciiCount = 0;    int nonAsciiCount = 0;    for (NSUInteger i = 0; i < self.length; i++) {        unichar c = [self characterAtIndex:i];        if (isascii(c)) {            asciiCount++;        } else {            nonAsciiCount++;        }    }    int count = (asciiCount + 1) / 2 + nonAsciiCount;    return count;}//获取指定字符长度字符对应的字符串- (NSString *)chineseSubStringWithMaxCount:(NSUInteger)maxCount{    NSUInteger maxCount1 = 2 * maxCount;    NSUInteger count = 0;    NSUInteger index = 0;    for (NSUInteger i = 0; i < self.length; i++) {        unichar c = [self characterAtIndex:i];        if (isascii(c)) {            count++;        } else {            count += 2;        }        if (count == maxCount1) {            index = i + 1;            break;        } else if (count > maxCount1) {            index = i;            break;        }    }    if (index == 0) {        index = self.length;    }    NSString *subString = [self substringToIndex:index];    return subString;}

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