iOS如何去除小数点后无效的0

-(void)test

{

    NSString * testNumber = @"3.001400";

    NSString * s = nil;

    long offset = testNumber.length - 1;

    while (offset)

    {

        s = [testNumber substringWithRange:NSMakeRange(offset, 1)];

        if ([s isEqualToString:@"0"] || [s isEqualToString:@"."])

        {

            offset--;

        }

        else

        {

            break;

        }

    }

    NSString * outNumber = [testNumber substringToIndex:offset+1];

    NSLog(@"%@", outNumber);

    NSLog(@"11111111");

}