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 ..
Related
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:
I have 2 UITextFields. one is for $ and another is for Riel. when I type in textfield$, I want to see value in textfieldRiel automatically. How to do that ?
Implement uitextfielddelegate method
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
textFieldRiel.text = textField.text;
return YES;
}
Take a look at the UITextFieldDelegate protocol, conform to it and make your controller class the delegate of the first ($) UITextField. Then for example in the textField:shouldChangeCharactersInRange:replacementString: method, which gets called whenever the user types a new character, populate the other UITextField according to your requirements!
First Declare the in your interface file.
Then implement uitextfielddelegate method
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
textfieldRiel.text=string;
return TRUE;
}
just a simple thinks you need to implement the delegates methods of the UiTextfields.
below is the code for the when type into one textfield that text also write automatically into the Riel textfield.
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
self.txtRiel.text=textField.text
return YES;
}
Also Refer this method in Apple Documentation
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string;
- (void)textFieldDidBeginEditing:(UITextField *)textField;
- (void)textFieldDidEndEditing:(UITextField *)textField;
Also refer the Apple Documentation here.
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.
I have a button that I only want enabled when a textfield is not blank. I have been trying to do this by implementing the following method, without any luck.
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
Is there another delegate method that I could implement that gets fired after the text is changed? In this method is there some way to tell what key is being pressed, if it's a delete or something like that?
You can just check for string.length == 0 and range.length > 0;. This denotes a deletion. However, what you really want is to just do the pending modification and then check that you still have a non-empty string.
Something like this (typed in, not compiled):
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
NSString *testString = [textField.text stringByReplacingCharactersInRange:range withString:string];
if( testString.length )
myButton.enabled = YES;
else
myButton.enabled = NO;
return YES;
}