IOS 最多获取小数点后2位的方法

+ (BOOL)validateNum:(NSString *)num{

    NSString *numRegex = @"^[0-9]+(.[0-9]{1,2})?$";

    NSPredicate *numTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", numRegex];

    return [numTest evaluateWithObject:num];

}