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iOS开发探索-十六进制和字符串相互转换

iOS开发探索-十六进制和字符串相互转换

作者: 零距离仰望星空 | 来源:发表于2016-02-20 19:18 被阅读11146次

    在iOS开发中,我们会遇到十六进制和字符串之间相互转换,话不多说,直接上代码:

    //将十六进制的字符串转换成NSString则可使用如下方式:
    + (NSString *)convertHexStrToString:(NSString *)str {
    if (!str || [str length] == 0) {
        return nil;
    }
    
    NSMutableData *hexData = [[NSMutableData alloc] initWithCapacity:8];
    NSRange range;
    if ([str length] % 2 == 0) {
        range = NSMakeRange(0, 2);
    } else {
        range = NSMakeRange(0, 1);
    }
    for (NSInteger i = range.location; i < [str length]; i += 2) {
        unsigned int anInt;
        NSString *hexCharStr = [str substringWithRange:range];
        NSScanner *scanner = [[NSScanner alloc] initWithString:hexCharStr];
        
        [scanner scanHexInt:&anInt];
        NSData *entity = [[NSData alloc] initWithBytes:&anInt length:1];
        [hexData appendData:entity];
        
        range.location += range.length;
        range.length = 2;
    }
    NSString *string = [[NSString alloc]initWithData:hexData encoding:NSUTF8StringEncoding];
    return string;
    }
    

    `

    //将NSString转换成十六进制的字符串则可使用如下方式:
    + (NSString *)convertStringToHexStr:(NSString *)str {
    if (!str || [str length] == 0) {
        return @"";
    }
    NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];
    
    NSMutableString *string = [[NSMutableString alloc] initWithCapacity:[data length]];
    
    [data enumerateByteRangesUsingBlock:^(const void *bytes, NSRange byteRange, BOOL *stop) {
        unsigned char *dataBytes = (unsigned char*)bytes;
        for (NSInteger i = 0; i < byteRange.length; i++) {
            NSString *hexStr = [NSString stringWithFormat:@"%x", (dataBytes[i]) & 0xff];
            if ([hexStr length] == 2) {
                [string appendString:hexStr];
            } else {
                [string appendFormat:@"0%@", hexStr];
            }
        }
    }];
    
    return string;
    }
    

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