ios 輸入框輸入6位元字

ios 輸入框輸入6位元字

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{    if (textField.tag == 11) {        //新密碼                if(range.location <= 5){                                                if ([string length]>0)                            {                                unichar single=[string characterAtIndex:0];//當前輸入的字元                                if ((single >='0' && single<='9'))//資料格式正確                                {                                     return YES;                                 }else{                                     return NO;                                 }                             }else{                                 return YES;                             }                                    }else{                                        return NO;                }    }else{        //確認新密碼        if(range.location <= 5){                        if ([string length]>0)            {                unichar single=[string characterAtIndex:0];//當前輸入的字元                if ((single >='0' && single<='9'))//資料格式正確                {                    return YES;                }else{                    return NO;                }            }else{                return YES;            }                    }else{                        return NO;        }    }}