My Header file
MyClass.h
#interface MyClass : UIViewController<UITextFieldDelegate>
{
}
#property (retain, nonatomic) IBOutlet UITextField *customValue;
MyClass.m
- (void)viewDidLoad
{
customValue.delegate=self;
}
- (void)textFieldDidBeginEditing:(UITextField *)customValue
{
NSLog(#"custom tips value %#",customValue.text);
}
My NSLog is printing the message, but the customValue.text is not being displayed and is coming as null.
EDIT 1
I need to get the values that is entered in the textfiled as and when the user is enter the value
textFieldDidBeginEditing as it name indicates , it will work when you start editing on the textField.
For accomplishing your requirement you need to use the shouldChangeCharactersInRange delegate method.
- (BOOL)textField:(UITextField *)e shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSString *substring = textField.text;
substring = [substring stringByAppendingString:string];
NSLog(#"Text : %#",substring);
return YES;
}
textFieldDidBeginEditing:
Tells the delegate that editing began for the specified text field.
- (void)textFieldDidBeginEditing:(UITextField *)textField Parameters
textField
The text field for which an editing session began.
Discussion
This method notifies the delegate that the specified text field just
became the first responder. You can use this method to update your
delegate’s state information. For example, you might use this method
to show overlay views that should be visible while editing.
Implementation of this method by the delegate is optional.
Availability
Available in iOS 2.0 and later.
Declared In UITextField.h
textField:shouldChangeCharactersInRange:replacementString:
Asks the delegate if the specified text should be changed.
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
Parameters
textField
The text field containing the text.
range
The range of characters to be replaced
string
The replacement string.
Return Value
YES if the specified text range should be replaced; otherwise, NO to
keep the old text. Discussion
The text field calls this method whenever the user types a new
character in the text field or deletes an existing character.
Availability
Available in iOS 2.0 and later.
Declared In UITextField.h
For more check UITextFieldDelegate
This is because textFieldDidBeginEditing: is called on the user first touch of the textField.
To get the textField's text as the user changes it, connect the "Editing Changed" event to the File's Owner's IBAction.
Use This
- (BOOL)textField:(UITextField *)customTipsValue shouldChangeCharactersInRange:(NSRange)range
replacementString:(NSString *)string
{
NSLog(#"textfield value %#",customTipsValue.text);
return YES;
}// return NO to not change text
Have you noticed that the method
- (void)textFieldDidBeginEditing:(UITextField *)customTipsValue
Is called when you start to edit the textField, not when you enter characters.
Check more info here:
UITextField Reference
just set clear textfield is no when its begin to edit mode..
- (void)viewDidLoad
{
customValue.delegate=self;
[customValue setClearsOnBeginEditing:NO];// Add this line
}
You will need this textField:shouldChangeCharactersInRange:replacementString:
Related
I just made a formatter class that will automatically format numbers typed into a uitextfield and give back the correct format.
i.e.
Text field will look like this $0.00
if you type 1,2,3,a,b,c you get $1.23 in the text field.
I did this by making a custom class that was a UITextfieldDelegate and responded to the textfields delegate methods.
However my viewcontroller also needs to respond to when the text changes in this text field.
Can I have to delegates? Or am I going to have to make my formatter class have a delegate method also?
The way I solved this was to make a class method that would return the correctly formatted the string.
Then I kept the delegation to the viewController.
When it asks should the text field change. I simply set the text using my class method and then return no so that it essentially ignores the users input.
I also propose that you use a NSNotificationCenter for such a situation since you can't use two delegates, and here is an example of how to use NSNotificationCenter.
No, you can't have two delegates at once, it's one property, if you assign it for the second time, the first delegate will stop being a delegate. What you could do is make a common delegate class, where you set up an NSNotificationCenter to send notifications corresponding to the UITextField's events, and then register all your classes (which have to receive these events) to the NSNotificationCenter.
I realize I am a little late to this party, but why not just add the CustomDelegate class to your VC in Interface Builder and set the delegate for the UITextField to that? No extra code in the VC is required, no UITextField subclassing is needed either. Project link below that does this to custom format a phone number.
Link to example project This link will go away when I decide it will go away. It could live on here forever (or as long as Dropbox is in business).
Added code example of the delegate class (although if someone had any amount of experience in iOS development, this wouldn't be needed.) That screenshot explains just about all of the answer. Example project link added as a convenience.
Code from the Delegate class:
Header File:
#import <Foundation/Foundation.h>
#interface PhoneNumberFormatterDelegate : NSObject <UITextFieldDelegate>
#end
Implementation File:
#import "PhoneNumberFormatterDelegate.h"
#implementation PhoneNumberFormatterDelegate
#pragma mark - My Methods
-(void)textFieldDidChange:(UITextField *)textField {
if ([textField.text length] > 11) {
[textField resignFirstResponder];
}
}
#pragma mark - UITextField Delegate Methods
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
// If user hit the Done button, resign first responder
if([string isEqualToString:#"\n"]){
[textField resignFirstResponder];
return NO;
}
// All digits entered
if (range.location == 12) {
[textField resignFirstResponder];
return NO;
}
// Reject appending non-digit characters
if (range.length == 0 &&
![[NSCharacterSet decimalDigitCharacterSet] characterIsMember:[string characterAtIndex:0]]) {
return NO;
}
// Auto-add hyphen before appending 4rd or 7th digit
if (range.length == 0 &&
(range.location == 3 || range.location == 7)) {
textField.text = [NSString stringWithFormat:#"%#-%#", textField.text, string];
return NO;
}
// Delete hyphen when deleting its trailing digit
if (range.length == 1 &&
(range.location == 4 || range.location == 8)) {
range.location--;
range.length = 2;
textField.text = [textField.text stringByReplacingCharactersInRange:range withString:#""];
return NO;
}
return YES;
}
- (void)textFieldDidBeginEditing:(UITextField *)textField {
[textField addTarget:self action:#selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
}
- (void)textFieldDidEndEditing:(UITextField *)textField {
[textField removeTarget:self action:#selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
}
#end
I am trying to make changes in a textfield which is very next textfield. e.g. if i call a TextFieldShouldReturn method (At that time tag which comes in this method is 0 and i want to perform action on a textfield who's tag is 1)and now i try that to make my very next textField to becomeFirst Responder. Both textFields have same IBOutlet but different tags.
I am a newbie so kindly don't mind my silly question.
You can use UIViews method viewWithTag: to get the next UITextField.
maybe something like this:
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
UITextField *nextTextField = (UITextField *)[self.view viewWithTag:textField.tag+1];
[nextTextField becomeFirstResponder];
return NO;
}
You mean you want to obtain the tag number in textFieldShouldReturn method ?
Here is the way :
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
int tag = textField.tag; // then do whatever you want with this information
}
I want to select all text from the UITextField selected when i start editing. I tried the below code but this doesn't work.
[txt selectAll:self];
Please check where you have placed it... Try putting the code above in
-(void)textFieldDidBeginEditing:(UITextField *)textField
{
[textField selectAll:self];
}
And also txt must be UITextField. Also do not forget to set the delegate for txt as
txt.delegate = self;
where you have declared it and add UITextFieldDelegate in .h as
#interface ViewController : UIViewController <UITextFieldDelegate>
This will definitely work....It worked for me..
Xyz answered correctly, but you don't necessarily need to use delegate. You may just connect action from interface builder on "Editing did begin" and write same code there.
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
NSString * str = [textField.text stringByReplacingCharactersInRange:range withString:string];
return YES;}
when you start editing use this code to store it ur string
I am trying to disable my send button (UIBarButtonItem within a toolbar) whenever there is no input in the "userInput" UITextField, and enable it when there is. Here is the code I've written - I can't quite figure out why it isnt working.
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if (userInput.text.length >0) {
[sendButton setEnabled:YES];
}else{
[sendButton setEnabled:NO];
}
}
Im also getting a warning that says "control reaches end of non-void function."
Im very new to xcode and programming so I'm not sure what that is telling me.
Thanks for any help!!
The text field object sends the message shouldChangeCharactersInRange to its delegate asking whether the change (adding the new character or removing a character) should be permitted or not. Since you don't want to refuse any changes made to the text field itself, you must return YES from this method. The warning
control reaches end of non-void function
means you have a non-void function so you are supposed to return something. Since nothing was being returned, this message popped up.
One important thing to remember is that this delegate method is called before the change is made, which makes sense because the delegate is being asked for permission to allow or disallow the change. If the delegate refuses, the text field's value will remain the same regardless of what the user types.
So calling userInput.text is useless because it will give the old value back as the change hasn't been made yet. However, there is enough information in the parameters of this method to construct the new to-be value of the text field.
NSString *newText = [textField.text stringByReplacingCharactersInRange:range withString:string]);
The complete method would look like,
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
NSString *newText = [textField.text stringByReplacingCharactersInRange:range withString:string];
BOOL isFieldEmpty = [newText isEqualToString:#""];
sendButton.enabled = !isFieldEmpty;
return YES;
}
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if (userInput.text.length >0) {
[sendButton setEnabled:YES];
}else{
[sendButton setEnabled:NO];
}
return YES;
}
ok you need in set enable NO in vieWillAppear
-(void)viewWillAppear:(BOOL)animated
{
[self.sendButton setEnabled:NO];
}
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if (userInput.text.length >0) {
[self.sendButton setEnabled:YES];
}else{
[self.sendButton setEnabled:NO];
}
return YES;
}
make UIBarButton as property and IBOUtlet and make proper connection
.h
UIBarButton *sendButton;
#property(nonatomic,retain) IBOutlet UIBarButton *sendButton;
and in .m
#synthesize sendButton;
and
-(void)dealloc
{
[self.sendButton release];
[super dealloc];
}
and also remember to make connection for textField from IB.
In your controller add (weak) outlets for both the UITextView and UIBarButtonItem and hook them up to the items in view.
Add another IBAction to controller for example:
- (void)textChanged:(id)sender
{
if ( [self.someTextField.text length] > 0 )
[self.someBarButtonItem setEnabled:YES];
else [self.someBarButtonItem setEnabled:NO];
}
Hook up UITextView's Edit Changed event to the textChanged: you've just created.
The Edit Changed even fires up when characters are typed into UITextField, you check the length of the text and enable/disable UIBarButtonItem when the text field has some text.
You can also in viewDidLoad: check the initial text length and enable/disable the button depending on the text.
Hope that helps.
It works for me in iOS 6.1.
In My app i need to post the value of uitextfield as soon as user enter the fourth character.
how can get the value of uitextfield when the user enter the fourth character.
Can any one tell me how can i do it?
Set the UITextField's delegate to the view controller/file's owner and use the textViewDidChange delegate method.
- (void)textViewDidChange:(UITextView *)textView {
if ([textView.text length] == 4) {
// Your post action goes here, with the value being textView.text
}
}
u can use UITextField delegate method -
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
it calls whenever user enter char ..