判断17位VIN码的键盘

简单的输入17位VIN码的键盘，能判断位数，能点击播放声音并能控制是否播放，键盘收起和正则判断之类的并没有做。已上传git。传送门

补充：同事那里有一个java的判断VIN码的类 照着改成OC的代码 不知道正确与否 先放上备忘吧 (注意要先判断字符串是17位)

-(BOOL)judgeVIN:(NSString*)str
{
    
    NSMutableDictionary * weights=[NSMutableDictionary dictionaryWithDictionary:@{@"1":@"8",@"2":@"7",@"3":@"6",@"4":@"5",@"5":@"4",@"6":@"3",@"7":@"2",@"8":@"10",@"9":@"0",@"10":@"9",@"11":@"8",@"12":@"7",@"13":@"6",@"14":@"5",@"15":@"4",@"16":@"3",@"17":@"2"}];
    NSMutableDictionary * values=[NSMutableDictionary dictionaryWithDictionary:@{@"0":@"0",@"1":@"1",@"2":@"2",@"3":@"3",@"4":@"4",@"5":@"5",@"6":@"6",@"7":@"7",@"8":@"8",@"9":@"9",@"A":@"1",@"B":@"2",@"C":@"3",@"D":@"4",@"E":@"5",@"F":@"6",@"G":@"7",@"H":@"8",@"J":@"1",@"K":@"2",@"M":@"4",@"L":@"3",@"N":@"5",@"P":@"7",@"R":@"9",@"S":@"2",@"T":@"3",@"U":@"4",@"V":@"5",@"W":@"6",@"X":@"7",@"Y":@"8",@"Z":@"9"}];
    
    
    if ([str containsString:@"I"]||[str containsString:@"O"]) {
        return NO;
    }else{
        int sum=0;
        for (int i=0; i