iOS UITextField 输入含小数的数字（位数限制）

来源：互联网发布：大数据的机遇与挑战编辑：程序博客网时间：2024/06/09 19:41

//1.先实例化textField，然后代理设为自己//2.textField.text是存在字符   string是输入字符- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{  //对复制黏贴也有效     int location = (int)[mInputMoney.text rangeOfString:@"."].location;    if (location > 0) {        isHavePoint = YES; //isHavePoint 是BOOL型    }else    {        isHavePoint = NO;    }    if ([string length] > 0) {        unichar single = [string characterAtIndex:0];//输入的字符        if ((single >= '0' && single <= '9') || single == '.')//输入格式正确        {            if ([mInputMoney.text length] == 0) {                if (single == '.') {                    [self.view makeToast:@"亲，第一个数字不能为小数点"];                    return NO;                }                    if (single == '0') {                        [self.view makeToast:@"亲，第一个数字不能为0"];                        return NO;                    }            }            if (single == '.') {                if (!isHavePoint) {                    isHavePoint = YES;                    return YES;                }                if (isHavePoint) {                    [self.view makeToast:@"亲，您已经输入过小数点了"];                    return NO;                }            }else            {                //判断小数点的位数                if (isHavePoint) {                    NSRange pointRange = [mInputMoney.text rangeOfString:@"."];                    int location = (int)range.location - (int)pointRange.location;                    if (location <= 2) {                        return YES;                    }else                    {                        [self.view makeToast:@"亲，您最多输入两位小数"];                        return NO;                    }                }else                {                    return YES;                }            }        }else        {            [self.view makeToast:@"亲，您输入的格式不正确"];            return NO;        }    }else    {        return YES;    }    return YES;}

//限制11位和对删除字符的判断- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{   if ([string isEqualToString:@""] && range.length > 0) {//输入删除字符            return YES;        }   if (textField.text.length >= 11) {            return NO;        }  return YES;}

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