I'm at bit of a loss here, I'm obviously doing something wrong and haven't grasped the way rangeOfString works.
I have a number of textfields and on certain of them, the phone and fax ones, i want to only permit a small range of values 1234567890+-() to be entered
I'm trying to use textfield: shouldChangeCharactersInRange: replacementString: to not return the characters if they fall outside the specified set of characters.
My method is below and below that is an example of the log .
The code for not returning a ';' works fine, as does the code making sure its only the phone and fax number fields that are being tested.
however what happens is it doesn't matter what character i enter - a '1' or '2' a letter or symbol, i get the same result NSNotFound.
Any idea where i am going wrong ?
Cheers
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if ([string isEqualToString:#";"]) {
return NO;
}
if( ([textField.placeholder isEqualToString:self.locationFieldNames[phoneNumber]]) | ([textField.placeholder isEqualToString:self.locationFieldNames[faxNumber]])){
NSString *includeString = #"1234567890-()+";
if ([string rangeOfString:includeString].location == NSNotFound) {
DLog(#"%# is NSNOTFOUND", string);
return NO;
} else {
DLog(#"%# is !NSNOTFOUND", string);
return YES;
}
}
DLog(#"got here");
return YES;
}
and example from the log
2013-11-12 12:59:19.832 SplashDL[4138:70b] -[DiveFacilityDetailViewController textField:shouldChangeCharactersInRange:replacementString:] 1 is NSNOTFOUND
2013-11-12 12:59:24.556 SplashDL[4138:70b] -[DiveFacilityDetailViewController textField:shouldChangeCharactersInRange:replacementString:] q is NSNOTFOUND
2013-11-12 12:59:26.806 SplashDL[4138:70b] -[DiveFacilityDetailViewController textField:shouldChangeCharactersInRange:replacementString:] ! is NSNOTFOUND
You have made misstake in following line of code:
if ([string rangeOfString:includeString].location == NSNotFound)
Change it to following:
if ([includeString rangeOfString:string].location == NSNotFound)
Also note that user may not only type text but he can also copy/paste it from somewhere. So the length of string may be greater than 1.
Related
my requirement for validation is to validate username which allows to enter small a-z,and 0-9, and only two symbol _ and .(dot)
but symbol do not repeat.
and symbol not allowed at the starting of the name.
can any one help me ?? how to do this validation?
i have tried this code but it works fine but it repeats symbol how can i avoid to repeat?
- (BOOL)validateString:(NSString*)stringToSearch
{
NSString *emailRegex = #"[a-z0-9._]{5,15}";
NSPredicate *regex = [NSPredicate predicateWithFormat:#"SELF MATCHES %#", emailRegex];
return [regex evaluateWithObject:stringToSearch];
}
Use the following regex to check if the characters are correct:
^([a-z0-9]+[._])*[a-z0-9]+$
Debuggex Demo
Additionally and separately check the string length. (or use lookaheads)
Edit: it seems like I misread some of the requirements. The above regex disallows symbol at the end of the name as well. If you want to allow symbols there, change the regex to
^([a-z0-9]+[._]?)*$
If you use predicates you can omit the leading ^ and trailing $.
Pure regex approach, used lookahead for count, might have other simplified solution
"(?=[a-z0-9._]{5,15})([a-z0-9][._]?)+"
EDIT
Regarding the additional question: What to avoid the user enter rejected characters
Technically you can achieve that by implementing the UITextViewDelegate method textView(_:shouldChangeTextInRange:replacementText:). But it might give the user impression that the keyboard is not responding correctly.
So it might be a better user experience that implementing textViewShouldEndEditing(_:) method with some kind of alert showing the alert.
define Validation #"abcdefghijklmnopqrstuvwxyz0123456789_."
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSCharacterSet *unacceptedInput = nil;
unacceptedInput = [[NSCharacterSet characterSetWithCharactersInString:ALPHA] invertedSet];
if ([[string componentsSeparatedByCharactersInSet:unacceptedInput] count] <= 1) {
int newLength = (int)textField.text.length + (int)string.length - (int)range.length;
if (newLength > 50) {
return false;
} else {
return true;
}
} else {
return false;
}
}
here I had to also put validation for text length not exceed 50 characters in my project so you can remove that condition
Im trying to apply validation on UITextField in such a way that it should not accept anything rather than decimal number.
I used following delegate method of UITextField:
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSDecimalNumber *number2 = [NSDecimalNumber decimalNumberWithString:string];
if (!string || [string length] < 1 || [string isEqualToString:#""] )
{
return YES;
}
if (!number2 || [number2 isEqualToNumber:[NSDecimalNumber notANumber]])
{
return NO;
}
return YES;
}
Its working perfect,but it has two issues.
1. when i'm entering value 'E' or 'e' its accepting it.
2.Once it accepted letter 'E' or 'e',Its accepting all other english letters.
This is from the documentation.
Besides digits, numericString can
include an initial “+” or “–”; a single “E” or “e”, to indicate the
exponent of a number in scientific notation; and a single
NSLocaleDecimalSeparator to divide the fractional from the integral
part of the number.
Maybe you can use NSRegularExpression instead
You should use NSNumberFormatter to validate numeric user input.
In my app I am taking phone number as an input from user. Number should be in US format. I want to display it like (555)-888-888 dynamically. For example when user starts to input number when he reaches to 4 digit it shows number like this (555)-4 and so on. I tried to replaceString method but i found that it will not work.
Look at NBAsYouTypeFormatter class of libPhoneNumber-iOS library.
You create new instance of NSAsYouTypeFormatter with your US region code given:
NBAsYouTypeFormatter *asYouTypeFormatter = [[NBAsYouTypeFormatter alloc] initWithRegionCode:REGION_CODE_STRING];
Then every time user changes the phone number you call:
- (NSString*)inputDigit:(NSString*)nextChar;
or
- (NSString*)removeLastDigit;
Returned NSString from this two methods is your dynamically formatted phone number.
I am going to explain from scratch. So, new users can get the way from start.
Download libPhoneNumber-iOS library from here. At the bottom side of the page of that link, you will find what files you need to add to your project.
Now, follow below steps to implement.
(1) Import files in the view controller where you need your textfield to be formatted.
#import "NBPhoneMetaDataGenerator.h"
#import "NBPhoneNumberUtil.h"
#import "NBAsYouTypeFormatter.h"
and make instance of type NBAsYouTypeFormatter in header file:
NBAsYouTypeFormatter *asYouTypeFormatter;
(2) In the viewDidLoad method of that view controller, initialize that object taken earlier:
asYouTypeFormatter = [[NBAsYouTypeFormatter alloc] initWithRegionCode:#"IN"];
Note: #"IN" is for India. You can set it to anything you want. Refer to plist file that will be included in libPhoneNumber-iOS library to view full list of region codes.
(3) In delegate method of UITextField, dynamically manage text of yout textfield.
#pragma mark
#pragma mark - Phone Number textfield formatting
# define LIMIT 18 // Or whatever you want
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
// Just allow 18 digits
if(!(([string length] + range.location) > LIMIT))
{
// Something entered by user
if(range.length == 0)
{
[txtNumber setText:[asYouTypeFormatter inputDigit:string]];
}
// Backspace
else if(range.length == 1)
{
[txtNumber setText:[asYouTypeFormatter removeLastDigit]];
}
}
return NO;
}
Hope it helps !!!
I found a solution that I wanted to share because, even with the solutions previously presented here, I had a hard time finding how to make it work.
I have a tableView whose cells include a textField. One of this cells bear the phone number. It can be already filled-in in some cases, or not.
This is in Swift by the way.
Make sure your bridging header file nameOfYourProject-Bridging-Header includes the following line:
#import "NBAsYouTypeFormatter.h"
Declare a property for the NBAsYouTypeFormatter:
private var phoneFormatter: NBAsYouTypeFormatter!
in viewDidLoad, or didSet of a property, initialize the NBAsYouTypeFormatter with the country code:
// yourRegionCode is a 2-digit country code (ISO 3166)
phoneFormatter = NBAsYouTypeFormatter(regionCode: yourRegionCode)
Declare your viewController as a TextFieldDelegate and implement function shouldChangeCharactersInRange:
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
// Phone number cell
if cellContainsPhoneNumber { // This is specific to your own tableView
// Formatting phone number as you type
let textWithoutSpaces = textField.text.stringByReplacingOccurrencesOfString(" ", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil)
phoneFormatter.inputString(textWithoutSpaces) // This is the initial value of the phoneFormatter each time the delegate method is called
let formattedNumber: String!
if string == "" {
formattedNumber = phoneFormatter.removeLastDigit()
} else {
formattedNumber = phoneFormatter.inputDigit(string)
}
// set the textField text with the new formattedNumber
textField.text = formattedNumber
return false
}
return true
}
This way, it works exactly as Apple's contact edition mechanism.
Let me know if this helped you.
Here's an updated snippet that generally works for me (Swift 2.0):
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
// Allow up to 18 chars
if !(string.characters.count + range.location > 18) {
if range.length == 0 {
// original text didn't change
textField.text = phoneFormatter?.inputDigit(string)
} else if range.length == 1 {
// user pressed backspace
textField.text = phoneFormatter?.removeLastDigit()
} else if range.length == textField.text?.characters.count {
// text was cleared
phoneFormatter?.clear()
textField.text = ""
}
}
return false
}
The main thing that changed was it allows for the user to press the "Clear" button or Select All -> Clear.
There are some edge cases such as the user editing specific digits in the phone number which this doesn't handle but could be easily added.
Here is a solution using libPhoneNumber that also handles the non trivial cases of editing in the middle of the number, cutting and pasting, selection and typing. It keeps the cursor stable and does not behave unexpectedly.
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if(range.location == textField.text.length && range.length == 0)
{
// Something added at end
textField.text = [numberFormatter inputDigit:string];
}
else if(range.location == textField.text.length-1 && range.length == 1)
{
// Backspace at end
textField.text = [numberFormatter removeLastDigit];
} else {
// Other modification in middle
NSString* input = textField.text;
// New cursor position after modification
NSUInteger cursorIdx = range.location + string.length;
// If backspacing to delete a format character - just reposition the cursor.
BOOL backspaceOnly = range.length == 1 && string.length == 0 && !isdigit([input characterAtIndex:range.location]);
if(!backspaceOnly) {
// make the modification, reformat the number
input = [input stringByReplacingCharactersInRange:range withString:string];
[numberFormatter clear];
BOOL rememberCursorPos = NO;
NSString* text;
// reinput the number to the formatter
// remembering the first digit position at or after the cursor
for (int i = 0; i < input.length; ++i)
{
if(i == cursorIdx) {
rememberCursorPos = YES;
}
char digit = [input characterAtIndex:i];
switch(digit) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if(!rememberCursorPos) {
text = [numberFormatter inputDigit:[NSString stringWithFormat:#"%c", digit]];
} else {
text = [numberFormatter inputDigitAndRememberPosition:[NSString stringWithFormat:#"%c", digit]];
rememberCursorPos = NO;
}
break;
}
}
// reformat the number
textField.text = text;
// get updated cursor position (formatter position starts at 1)
cursorIdx = numberFormatter.getRememberedPosition - 1;
}
// reposition the cursor
UITextPosition* position = [textField positionFromPosition:textField.beginningOfDocument offset:cursorIdx];
textField.selectedTextRange = [textField textRangeFromPosition:position toPosition:position];
}
return NO;
}
You can use this library for formatting input during typing https://github.com/luximetr/AnyFormatKit
Example
let textInputController = TextInputController()
let textInput = TextInputField() // or TextInputView or any TextInput
textInputController.textInput = textInput // setting textInput
let formatter = TextInputFormatter(textPattern: "### (###) ###-##-##", prefix: "+12")
textInputController.formatter = formatter // setting formatter
In this case TextInputController will format text in your textField or textView.
I would like to limit user input in a UITextField to 1-105. I have set the delegate and have successfully limited the actual number of characters via the following code, found elsewhere on Stackoverflow. Is there something that I can add in order to force the user to input any integer between 1 and 105?
#define MAXLENGTH 2
- (BOOL)textField:(UITextField *) textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
NSUInteger oldLength = [_startLevel.text length];
NSUInteger replacementLength = [string length];
NSUInteger rangeLength = range.length;
NSUInteger newLength = oldLength - rangeLength + replacementLength;
BOOL returnKey = [string rangeOfString: #"\n"].location != NSNotFound;
return newLength <= MAXLENGTH || returnKey;
}
I am using the number keypad, so the user is already limited to entering numbers. I just need to find something that will make them input something in the range.
Thanks in advance.
First convert the string to a number. In order of ease of use and lack of control, the ways you do that are -[NSString integerValue]*, NSNumberFormatter, and NSScanner. The formatter will give you an NSNumber from which you can then get the integerValue*; the other two get you primitives directly.
Once you have that, compare the number to the endpoints of your range, creating a boolean. Combine that boolean with the other two -- for length and lack of newline -- you already have, and return the result.
*For floating point, either floatValue or doubleValue.
In didEndEditing, get the text, convert it to an integer, and check the value. If it's out of range, display an error message. You might also reset the text to it's previous value, assuming it starts out in-range.
I've used a regular expression to validate inputs to the right format. I found some documentation on line on RegEx that I was able to use to build my expression. You might create a regular expression that requires the input to be 1, 2, or 3 digits. I'm no expert, but the string #"^[0-9]{1,3}$" should require 1 to 3 digits between 0 and 9 (the 0-9 defines the legal characters, and the {1,3} means that the user can enter 1 through 3 of them. The ^ at the beginning anchors the expression to the beginning of the string, and the "$" at the end anchors the expression to the end of the string.)
You can use the code below
NSString *numberRegex = #"[1-9]||[0-9][1-9]||[0-1]0[0-5]";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:#"SELF MATCHES %#", numberRegex];
BOOL b = [emailTest evaluateWithObject:numberField.text];
if (b)
{
//Code when number is in the range 1-105
}
else
{
//Code when number is not in the range 1-105
}
Hope this helps you
I'm using parse to store my data. I have a bunch of UITextField for user registration inside a view controller.
Now, in my phone text field, how do I format the text field to show the following depending on the total length.
+55 (21) 99999-9999 = 13 numbers
+55 (21) 9999-9999 = 12 numbers
I want to accept both 12 and 13 numbers and show the formatted phone in the textfield.
Now, for saving it to parse, I would like to save the formatted number with characters +, (, ), -.
I would also like to format my date text field to dd/mm/yyyy. Can anyone help me?
Thanks.
UPDATE
Ok, so I did the following:
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if (_telefoneTextField.text.length == 0)
_telefoneTextField.text = [NSString stringWithFormat:#"(%#",_telefoneTextField.text];
if (_telefoneTextField.text.length == 3)
_telefoneTextField.text = [NSString stringWithFormat:#"%#) ",_telefoneTextField.text];
if (_telefoneTextField.text.length == 9)
_telefoneTextField.text = [NSString stringWithFormat:#"%#-",_telefoneTextField.text];
return YES;
}
and
else if (textField == self.telefoneTextField)
{
if (_telefoneTextField.text.length == 14)
{
NSLog(#"Telefone sem o 9");
[self.nascimentoTextField becomeFirstResponder];
}
if (_telefoneTextField.text.length == 15)
{
NSLog(#"Telefone COM o 9");
NSMutableString *telefone = [[NSMutableString alloc] initWithString:_telefoneTextField.text];
[telefone deleteCharactersInRange:NSMakeRange(9,1)];
[telefone insertString:#"-" atIndex:10];
NSLog(#"%#", telefone);
_telefoneTextField.text = telefone;
[self.nascimentoTextField becomeFirstResponder];
}
else
{
NSLog(#"Telefone NAO esta no formato");
}
}
now, it works like I wanted. It changes the format in real time when the user is typing and when finish editing it checks to see how many chars, in case of 15, it changes the format again.
Now, one thing I couldn't do: How can I delete the phone number using the keyboard, I mean, it does't delete the numbers before the "-"character.
Thanks.
The best way to implement this by using regular expressions. See the following discussion
Regex not working correctly on iOS