OC计算字节长度

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对于文本框的输入字数限制

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- (NSUInteger) unicodeLengthOfString: (NSString *) text {
    NSUInteger asciiLength = 0;

    for (NSUInteger i = 0; i < text.length; i++) {

        unichar uc = [text characterAtIndex: i];

        asciiLength += isascii(uc) ? 1 : 2;
    }
    return asciiLength;
}