ios - 如何在 iPhone 中比较小数值和整数？

Question

您好，我的最小值为 100，最大值为 400。用户应在此值范围内输入。如果他们输入 400.5，则不应接受。这是我的文本字段的验证。我使用了以下代码

    NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
                [formatter setNumberStyle:NSNumberFormatterDecimalStyle];
                NSNumber *textFieldNumber = [formatter numberFromString:[dynamicHealthyHeartTxtFld text]];
                NSNumber *MaxNumber = [formatter numberFromString:[[healthyHeartFieldsAry objectAtIndex:getHHTag] objectForKey:@"MaxVal"]];
                NSNumber *MinNumber = [formatter numberFromString:[[healthyHeartFieldsAry objectAtIndex:getHHTag] objectForKey:@"MinVal"]];


                if ([self checkForDecimalValue:dynamicHealthyHeartTxtFld.text]) 
                {





                    if (([textFieldNumber decimalValue] < [MinNumber decimalValue]) || ([textFieldNumber decimalValue] > [MaxNumber decimalValue]) ) {

                        if ([textFieldNumber decimalValue] < [MinNumber decimalValue]) {

                            Custom_Alert *alert=[[Custom_Alert alloc] initWithTitle:@"Alert" message:[NSString stringWithFormat:@"The Value you entered in %@ is outside the acceptable range.Please correct and Continue ",[[healthyHeartFieldsAry objectAtIndex:getHHTag] objectForKey:@"TestName"]] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
                            [alert show];
                            enterAlert=YES;
                            [alert release];

                        }
                        else
                        {
                            Custom_Alert *alert=[[Custom_Alert alloc] initWithTitle:@"Alert" message:[NSString stringWithFormat:@"The Value you entered is %@ outside the acceptable range.Please correct and Continue",[[healthyHeartFieldsAry objectAtIndex:getHHTag] objectForKey:@"TestName"]] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
                            [alert show];
                            enterAlert=YES;
                            [alert release];

                        }

                    }


                }

如果我使用这段代码。它正在接受 400.5。请帮我解决这个问题。

Answer 1

您需要将文本字段返回的 NSString 转换为 NSNumber:

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
NSNumber *textFieldNumber = [formatter numberFromString:[textField text]];

然后使用

[textFieldNumber decimalValue] > 100.0 && [textFieldNumber decimalValue] < 400

检查范围。