how to clear text field in ios,
How can I make a textfield box remove all content on the users first keypress?
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if([tfieldDOB.text length] == 4)
{
tfieldDOB.text=[NSString stringWithFormat:#"%#/",tfieldDOB.text];
}
else if([tfieldDOB.text length]==7)
{
tfieldDOB.text=[NSString stringWithFormat:#"%#/",tfieldDOB.text];
}
return YES;
}
change the textfield attribute clear button mode in appears while editing
or other choice just use the single line, where you need to add
yourtextfieldname.text=#""; //it is used for clear the textfield values
Swift
yourtextfieldname.text=""
or another way
clearField =#"YES";
if([clearField isequaltostring:#"YES"]) //check this line in
{
tfieldDOB.text = #"";
clearField =#"NO";
}
Implement the text field's delegate method textFieldShouldBeginEditing: and set the text as empty string when the text field is just about to being editing.
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
[textField setText:#""];
return YES;
}
Or you can set the property clearsOnBeginEditing of the textfield as
[textField setClearsOnBeginEditing:YES];
and it will clear the text when editing begins
Related
I have a text field whose keyboard return key is default.
But I want it to be UIReturnKeySend when any text appears on the textfield.
I have tried it as follows.
- (BOOL)textField:(UITextField *)textFieldshouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
textField.returnKeyType = UIReturnKeySend;
return YES;
}
I know I will have to check for some conditions under this method, but for now I want it to at least change the returnKeyType which is not working.
As it happens in autoEnabling return key (i.e return key becomes active when we enter a text.) I want my return key to change from default to send whenever text appears.
[textField reloadInputViews] seems to do the trick...
if you want to change it while editing dynamically then write the below code :
- (BOOL)textField:(UITextField *)textFieldshouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
textField.returnKeyType = UIReturnKeySend;
[textField reloadInputViews];
return YES;
}
Since you want the return key type to change when any text appears in the textfield, why don't you try this :
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
if([textField.text length] > 0){
textField.returnKeyType = UIReturnKeySend;
}
else{
textField.returnKeyType = UIReturnKeyDefault;
}
}
Hope this helps you.
I have one UiTextField Called MobileNumber. and two pickerView called Operator and circle. When I enter first 4 digits of my number in textfield it displays the Operator pickerview,
how to call it when I enter first 4 digits value in textfield and display the pickerview
Use shouldChangeCharactersInRange textField's delegate method for entering numeric character
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if ([string rangeOfCharacterFromSet:[[NSCharacterSet decimalDigitCharacterSet] invertedSet]].location != NSNotFound)
{
//This field accepts only numeric entries.
return NO;
}
else //numeric value entered
{
NSString *strTxtField = [textField.text stringByAppendingString:string];
if(strTxtField.length == 4)
{
//show pickerview here
//Set return NO if you don't want more character to be added to textfield
//return NO;
}
return YES;
}
}
You can declare a notification that will be called on every single change in text field.
// Add a "textFieldDidChange" notification method to the text field control.
[textField addTarget:self
action:#selector(textFieldDidChange:)
forControlEvents:UIControlEventEditingChanged];
Now here on this method textFieldDidChange: you can access your text field and check if user has entered 4 digits you can show the picker.
try this code...
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];
if(newString.length == 4)
{
NSLog(#"show date picker");
//Set return NO if you don't want more character to be added to textfield
//return NO;
}
return newString.length <= 4;
}
make sure that your text field delegate set properly..
short version: How can I make a UITextField box remove all content on the users first keypress? I don't want the info removed until the user starts typing something. ie, clearing it on begin edit is not good enough.
long version: I have three UITextField that loop around (using the return key and catching the press in the "shouldReturn" method. There is text already in the UITextField, and if the user doesn't type anything and just goes to the next UITextField, the value should stay (default behaviour).
But I want it that if the user starts typing, it automatically clears the text first. Something like having the whole field highlighted, and then typing anything deletes the fiels and then adds the user keypress.
"Clear when editing begins" is no good, because the text is immediately cleared on the cursor appearing in the field. That's not desired. I thought I could use the placeholder here, but that doesn't work as a default, and I can't find a default value property. The Highlighted and Selected properties don't do anything in this regard either.
There is a delegate method called
textFieldDidBeginEditing:(UITextField*) tf{
tf.startedEdinting = YES;
}
textFeildDidEndEditing: (UITextField*) tf {
tf.startedEditing = NO;
}
Add startEditing in a category to UITextField.
Then if value changes clear the field:
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if (textField.startEditing){
textField.text = string;
} else {
textField.text = [textField.text stringByReplacingCharactersInRange:range withString:string];
}
}
You can add the property to the UITextField category in the following way:
.h
#property (nonatomic, assign) BOOL startEditing;
.m
#dynamic startEditing;
- (void) setStartEditing:(BOOL)startEditing_in{
NSNumber* num = [NSNumber numberWithBool:startEditing_in];
objc_setAssociatedObject(self, myConstant, num, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (BOOL) startEditing{
NSNumber* num = objc_getAssociatedObject(self, myConstant);
return [num boolValue];
}
Declare a BOOL variable in your .h file like.
BOOL clearField;
And implement the delegate methods like:
-(void)textFieldDidBeginEditing:(UITextField *)textField
{
clearField = YES;
}
-(void)textFieldDidEndEditing:(UITextField *)textField
{
clearField = NO;
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
clearField = NO;
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if(clearField)
{
textField.text = #""
clearField = NO;
}
}
I want to thank people for their answers, I implemented both of the main methods described here and both worked flawlessly. But I have since come across a much simpler, nicer answer and involves only one line of code :)
In the textField's didBeginEditing method, place [self.textField selectAll:self]; or [self.textField selectAll:nil];
The original answer I found had selectAll:self but this shows the cut/copy/paste menu. If you send nil instead of self the menu doesn't appear.
Adding this one line of code highlights the text on entering the textField (so gives the user a visual cue), and only removes everything once a key is pressed.
Another solution that fulfils the same purpose is by simply using a text field placeholder which is defined as:
The string that is displayed when there is no other text in the text field.
So as soon as the user starts typing, the placeholder text disappears.
That's something you can set from the storyboard, or programmatically. (Yes it took me two hours trying to figure it the harder way.. when the solution was literally one line change of code).
If you want to clear the text one the user interacts with it, there is an option in interface builder to where you can set the text field to "Clear when editing begins."
Try to use the following method.
- (BOOL) textField: (UITextField *)theTextField shouldChangeCharactersInRange: (NSRange)range replacementString: (NSString *)string {
if(isFirsttime==YES)
{
textfield.text==#"";
isFirsttime=NO;
}
return YES;
}
Declare and initialize a NSString variable for your textField's initial text
NSString *initialText=#"initial text";
Then implement methods:
-(void)textFieldDidBeginEditing:(UITextField *)textField
{
if(textField.text isEqualToString:initialText)
{
textField.text=#"";
}
}
-(void)textFieldDidEndEditing:(UITextField *)textField
{
if(textField.text isEqualToString:#"")
{
textField.text=initialText;
}
}
I'm trying to change the UIKeyboardType to the alphabet keyboard when the user types a space, mirroring the effect of typing an apostrophe. However, my code won't change the keyboard appearance until the user dismisses the keyboard and then brings it back again.
Edit: To clarify, the keyboard type starts as UIKeyboardTypeNumbersAndPunctuation and I want to change to ASCIICapable, because the typical user input is in the form of "# cups flour". I realized that the ASCIICapable keyboard has this functionality built-in, so presenting the ASCII capable keyboard but showing the numbers/punctuation first would work.
Here's my code:
- (BOOL) textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if ([string isEqualToString:#" "]) {
textField.keyboardType = UIKeyboardTypeASCIICapable;
}
return YES;
}
dismiss the keyboard and then become the first responder again. In my code, I created a IBOutlet for the textfield *tf. It worked.
- (BOOL) textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if ([string isEqualToString:#" "]) {
self.tf.keyboardType = UIKeyboardTypeNumberPad;
[textField resignFirstResponder];
[self.tf becomeFirstResponder];
}
return YES;
}
I am new to iPhone programming. I have two textfields in iPhone with numberPad Keyboard type and i am trying to implement a simple logic that on typing a single digit using numberPadKeyBoard, the control should shift to next textField i.e. second textfield should become FirstResponder. I don't know how to implement this. Please guys any help would be appreciated.
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if(textField == urFirstTextField) {
[urFirstTextField resignFirstResponder];
[urSecondtextField becomeFirstResponder];
}
}
UPDATE
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
if(textField != urFirstTextField)
{
[textField resignFirstResponder];
[urFirstTextField becomeFirstResponder];
return NO;
}
return YES;
}
Suppose you have 2 text field textField1 and textField2 then implement the delgate methods of the UITextFieldDelegate as
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
if(textField == textField1)
{
[textField1 resignFirstResponder];
[textField2 becomeFirstResponder];
}
return YES;
}
go through the delegate method of UITextField named "textField:shouldChangeText:inRange:" ..... check the length of your textField and make second textField as first responder before returning YES;
Or you can play with a lot of other delegate methods defined