十六进制带符号（-号）

- (NSString *)decimalwithFormat:(NSData *)dataV {
    
    if (dataV == nil) {
        return @"0";
    }
    
    NSData *ff = [DataConvert hexStringToData:@"FFFFFFFF"];
    NSInteger addupInt;
    NSString *resultStr;
    float addupF = 0.00;
    
    if ([[dataV subdataWithRange:NSMakeRange(0, 1)] isEqualToData:[DataConvert hexStringToData:@"ff"]]) {
        
        addupInt = [DataConvert dataToInteger:ff] - [DataConvert dataToInteger:dataV];
        addupF = (addupInt + 1) * 0.01;
        resultStr = [NSString stringWithFormat:@"-%.2f",addupF];
        
    } else {
        addupInt = [DataConvert dataToInteger:dataV];
        addupF = addupInt * 0.01;
        resultStr = [NSString stringWithFormat:@"%.2f",addupF];
    }
    
    NSLog(@"格式化数据 -- %@",resultStr);
    return resultStr;
}