I have an IBAction that is called when someone is done entering text in a field. I then validate the input. If I have determined there is an error, I display a message and want the user to enter into that same field again. Rather than make them select the text field to bring the keyboard up (which works fine) I want to just leave the keyboard displayed.
I am doing [SymbolEntered becomeFirstResponder]; as the last statement in my IBAction, but the keyboard still goes away. Am I putting that in the wrong place? Any help would be appreciated. Thanks.
- (IBAction)textFieldDoneEditing:(id)sender {
DebugMsg.text = nil;
DebugMsg2.text = nil;
DebugMsg3.text = nil;
NSLog (#"done editing");
NSLog (#"%#", SymbolEntered.text);
if ([SymbolEntered.text isEqualToString:nil])
{
Result.textColor = [UIColor redColor];
Result.text = #"You must enter a symbol!";
[SymbolEntered becomeFirstResponder];
}
else
{
if ([SymbolEntered.text isEqualToString:
[NSString stringWithCString:elements_table2[el_tbl_idx-1].element_symbol]])
{
correct_count++;
Result.textColor = [UIColor greenColor];
Result.text = #"Correct!";
Score.hidden = FALSE;
Score.text = [NSString stringWithFormat:#"Score: %d out of %d - %d Percent", correct_count, el_count+1,
(correct_count*100)/(el_count+1)];
GetNextElementButton.hidden = FALSE;
SymbolEntered.enabled = FALSE;
el_count++;
attempts = max_tries + 1;
}
else
{
Score.hidden = TRUE;
Result.textColor = [UIColor redColor];
if (attempts < max_tries)
{
if (attempts+1 == max_tries)
{
Result.text = #"Sorry, one more try -";
}
else
{
Result.text = #"Sorry, try again - ";
}
GetNextElementButton.hidden = TRUE;
attempts++;
}
else
{
Result.text = [[NSString alloc] initWithFormat: #"Sorry. The correct answer is %#",
[NSString stringWithCString:elements_table2[el_tbl_idx-1].element_symbol]];
Score.hidden = FALSE;
Score.text = [NSString stringWithFormat:#"Score: %d out of %d - %d Percent", correct_count, el_count+1, (correct_count*100)/(el_count+1)];
GetNextElementButton.hidden = FALSE;
SymbolEntered.enabled = FALSE;
el_count++;
}
}
}
[SymbolEntered becomeFirstResponder];
NSLog (#"end of textfieldoneediting");
}
You can do your validation in the UITextField textFieldShouldEndEditing: delegate method instead. If you return NO from that callback, the text field will remain first responder and the keyboard won't go away. (You'll have to make your controller object the text field's delegate if it isn't already, of course.)
Try calling the [textField becomeFirstResponder] sometime later? Also make sure the UITextField pointer is not nil or something. For more help please show some of your code, it's very hard to tell where the problem is like this.
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
[textField resignFirstResponder];
return YES;
}
Try This it will resign the keyboard.
Related
I am adding this Method to my code to format the textfield. I am using the code below to try and add the method, but it not working, what am I doing wrong?
.h file
NSString* phone_;
UITextField* phoneFieldTextField;
#property (nonatomic,copy) NSString* phone;
.m file
#synthesize phone = phone_;
ViewDidLoad{
self.phone = #"";
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:nil];
// Make cell unselectable and set font.
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.textLabel.font = [UIFont fontWithName:#"ArialMT" size:13];
if (indexPath.section == 0) {
UITextField* tf = nil;
switch ( indexPath.row ) {
case 3: {
cell.textLabel.text = #"Phone" ;
tf = phoneFieldTextField = [self makeTextField:self.phone placeholder:#"xxx-xxx-xxxx"];
phoneFieldTextField.keyboardType = UIKeyboardTypePhonePad;
[self formatPhoneNumber:phoneFieldTextField.text deleteLastChar:YES];
[cell addSubview:phoneFieldTextField];
break ;
}
// Textfield dimensions
tf.frame = CGRectMake(120, 12, 170, 30);
// Workaround to dismiss keyboard when Done/Return is tapped
[tf addTarget:self action:#selector(textFieldFinished:) forControlEvents:UIControlEventEditingDidEndOnExit];
}
}
// Textfield value changed, store the new value.
- (void)textFieldDidEndEditing:(UITextField *)textField {
//Section 1.
if ( textField == nameFieldTextField ) {
self.name = textField.text ;
} else if ( textField == addressFieldTextField ) {
self.address = textField.text ;
} else if ( textField == emailFieldTextField ) {
self.email = textField.text ;
} else if ( textField == phoneFieldTextField ) {
self.phone = textField.text ;
}else if ( textField == dateOfBirthTextField ) {
self.dateOfBirth = textField.text ;
}
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
NSString* totalString = [NSString stringWithFormat:#"%#%#",textField.text,string];
// if it's the phone number textfield format it.
if(textField.tag == 10 ) {
if (range.length == 1) {
// Delete button was hit.. so tell the method to delete the last char.
textField.text = [self formatPhoneNumber:totalString deleteLastChar:YES];
} else {
textField.text = [self formatPhoneNumber:totalString deleteLastChar:NO ];
}
return false;
}
return YES;
NSLog(#"Testing should change character in range");
}
-(NSString*) formatPhoneNumber:(NSString*) simpleNumber deleteLastChar:(BOOL)deleteLastChar {
if(simpleNumber.length == 0) return #"";
// use regex to remove non-digits(including spaces) so we are left with just the numbers
NSError *error = NULL;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:#"[\\s-\\(\\)]" options:NSRegularExpressionCaseInsensitive error:&error];
simpleNumber = [regex stringByReplacingMatchesInString:simpleNumber options:0 range:NSMakeRange(0, [simpleNumber length]) withTemplate:#""];
// check if the number is to long
if(simpleNumber.length>10) {
// remove last extra chars.
simpleNumber = [simpleNumber substringToIndex:10];
}
if(deleteLastChar) {
// should we delete the last digit?
simpleNumber = [simpleNumber substringToIndex:[simpleNumber length] - 1];
}
// 123 456 7890
// format the number.. if it's less then 7 digits.. then use this regex.
if(simpleNumber.length<7)
simpleNumber = [simpleNumber stringByReplacingOccurrencesOfString:#"(\\d{3})(\\d+)"
withString:#"($1) $2"
options:NSRegularExpressionSearch
range:NSMakeRange(0, [simpleNumber length])];
else // else do this one..
simpleNumber = [simpleNumber stringByReplacingOccurrencesOfString:#"(\\d{3})(\\d{3})(\\d+)"
withString:#"($1) $2-$3"
options:NSRegularExpressionSearch
range:NSMakeRange(0, [simpleNumber length])];
if (simpleNumber.length == 10 && deleteLastChar == NO) { [self resignFirstResponder];}
return simpleNumber;
NSLog(#"Testing format phone number");
}
#pragma mark - TextField
-(UITextField*) makeTextField: (NSString*)text
placeholder: (NSString*)placeholder {
UITextField *tf = [[UITextField alloc] init];
tf.placeholder = placeholder;
tf.text = text ;
tf.autocorrectionType = UITextAutocorrectionTypeNo ;
tf.autocapitalizationType = UITextAutocapitalizationTypeNone;
tf.adjustsFontSizeToFitWidth = YES;
tf.returnKeyType = UIReturnKeyDone;
tf.textColor = [UIColor colorWithRed:56.0f/255.0f green:84.0f/255.0f blue:135.0f/255.0f alpha:1.0f];
return tf ;
}
The method you are using:
-(NSString*) formatPhoneNumber:(NSString*) simpleNumber deleteLastChar:(BOOL)deleteLastChar
Returns an NSString Object. In your case you are calling the method correctly but you are not setting the Returned NSString object to anything. It is simply hanging there. You need to set the phoneFieldTextField to the formatted text like so:
phoneFieldTextField.text = [self formatPhoneNumber:phoneFieldTextField.text deleteLastChar:YES];
NOTE - If you want to learn more about return methods then read the following:
If you noticed some most methods are of the void type. You know this when you see a method like this:
- (void)someMethod {
int x = 10;
}
What void means is that the someMethod does not return anything to you. It simply executes the code within the method. Now methods than return an object or some other data type look like this:
- (int)returnSomething {
int x = 10;
return x;
}
First thing you will notice is the return type is no longer void, it is an int. This means the method will return an integer type. In this case the code executes and you are returned the value of x.
This is just the start of the topic of return methods but hopefully it makes things a bit clearer for you.
First off you need to tell us What is not working we don't have your app and all your code. You need to explain what is working and what is not working exactly. It took longer then necessary to figure out that your question is why is textField:shouldChangeCharactersInRange: not working. Did you set a breakpoint in the function to see what it was doing. Was it not being called?
That said your bug is that textField:shouldChangeCharactersInRange: is using tags to identify text fields but the rest of the code is using pointers
// if it's the phone number textfield format it.
- if(textField.tag == 10 ) {
+ if(textField.tag == phoneFieldTextField ) {
Also you didn't include the code for makeTextField:placeholder: There could be issues in it too. Compare your code to the makeTextField:placeholder: in my sample.
I created a sample project on GitHub. To fix this. I also demos a better approach to creating input forms using table views.
https://github.com/GayleDDS/TestTableViewTextField.git
Look at both diffs to see what I did to YourTableViewController.m to make things work.
https://github.com/GayleDDS/TestTableViewTextField/commit/d65a288cb4da7e1e5b05790ea23d72d472564793
https://github.com/GayleDDS/TestTableViewTextField/commit/31ecaec8c9c01204643d72d6c3ca5a4c58982099
There is a bunch of other Issues here:
You need to call [super viewDidLoad]; in your viewDidLoad method
You need to correctly indent your code (could be a cut and paste issue)
You should be using the storyboard to create your views. See the better solution tab and BetterTableViewController implementation.
Must Watch - iOS Development Videos
WWDC 2011 - Session 309 - Introducing Interface Builder Storyboarding
https://developer.apple.com/videos/wwdc/2011/?id=309
Stanford iPhone Programing Class (Winter 2013)
Coding Together: Developing Apps for iPhone and iPad
https://itunes.apple.com/us/course/coding-together-developing/id593208016
Lecture 9. Scroll View and Table View
Lecture 16. Segues and Text Fields
Looks like you are not setting the delegate <UITextFieldDelegate> in the .h file, and not assigning your textfield's delegate property to self tf.delegate = self; in order to call - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
Try that and let me know how it goes
-Good Luck!
#koray was right: you need to setup the delegate for the class. Your class should be declared as implementing the protocol UITextFieldDelegate (in addition to UITableViewDataSource, I assume)
then in your makeTextField: (NSString*)text placeholder: (NSString*)placeholder method, you need to have something like:
-(UITextField*) makeTextField: (NSString*)text
placeholder: (NSString*)placeholder {
UITextField *tf = [[UITextField alloc] initWithFrame:CGRectMake(40, 0, 150, 40)];
tf.placeholder = placeholder;
// (...)
tf.delegate = self;
return tf ;
}
Then you need to setup the delegate methods correctly. In the following example, I have a nav bar, since the numbers pad doesn't have a return or a done button. I setup a button that will act as the done button (you may have another way of making the keyboard go, and switching between text fields will trigger the end of edition anyway):
- (void) textFieldDidBeginEditing:(UITextField *)textField {
UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:#selector(doneEditing:)];
self.navBar.topItem.rightBarButtonItem = doneBtn;
}
- (void) doneEditing:(id) sender {
if(phoneFieldTextField.isFirstResponder) {
[phoneFieldTextField resignFirstResponder];
}
// (...)
self.navBar.topItem.rightBarButtonItem = nil;
}
Then, the magic happens in the textDidEndEditing delegate method:
- (void)textFieldDidEndEditing:(UITextField *)textField {
if ( textField == phoneFieldTextField ) {
self.phone = [self formatPhoneNumber:textField.text deleteLastChar:YES] ; // convert
[phoneFieldTextField setText:self.phone]; // display
}
// (...)
}
I have a calculator in which i would like to put the decimal point according to the button press for the decimal point. I get the decimal point but if I enter another digit the decimal pint vanishes and is overwritten .
The code is mentioned below for the decimal press:-
-(IBAction)decimalPressed:(id)sender{
calculatorScreen.text = [calculatorScreen.text stringByAppendingString:#"."];
}
For the digit press it is :-
-(IBAction)buttonDigitPressed:(id)sender{
currentNumber = currentNumber*10 + (float)[sender tag];
calculatorScreen.text = [NSString stringWithFormat:#"%g",currentNumber];
}
How can i do something like 23 then "." then 45. The result would be 23.45
I've recently done a calculator app and could understand your problem. Another thing you want to take note about the point is that you do not want to have multiple point in your calculation, e.g. 10.345.1123.5. Simply put, you want it to be a legal float number as well.
With that said, you can use a IBAction (remember to link it to your storyboard or xib file)
-(IBAction)decimalPressed:(UIButton *)sender
{
NSRange range = [self.display.text rangeOfString:#"."];
if (range.location ==NSNotFound){
self.display.text = [ self.display.text stringByAppendingString:#"."];
}
self.userIsInTheMiddleOfEnteringANumber = YES;
}
While it might be possible we are doing on the same project, it could also be entirely different (you starting from scratch by yourself) so i will go through some of the codes
you could replace UIButton with the default id, but it is better to static replace it to make clear clarification for yourself, or anyone else who view your code.
NSRange as the name implies, mark the range, and the range will be ur display text of calculation (e.g. 1235.3568), and the range of string it is targeting in this case is "."
therefore, if NSNotfound (rangeOfString "." is not found in the text range) you will append the current display text with "." with the function stringByAppendingString:#".", there is no else, so no function will take place if "." is already found, which solve the problem of multiple point on the display.
userIsInTheMiddleOfEnteringANumber is a BOOL to solve the problem of having 0 in ur display (e.g. 06357), if you have a method to change it, then replace my method name with your own.
Try with below code:
-(IBAction)buttonDigitPressed:(id)sender
{
UIButton *pressedButton = (UIButton *)sender;
calculatorScreen.text = [calculatorScreen.text stringByAppendingFormat:#"%d",pressedButton.tag];
currentNumber = [calculatorScreen.text floatValue];
}
-(IBAction)ButtonDot
{
decimalChecker = 10;
calculatorScreen.text = [NSString stringWithFormat:#"$ %g.", currentSavings];
decimalChecker=1;
}
-(IBAction)buttonDigitPressed:(id)sender
{
if (decimalChecker ==1)
{
currentDecimal = currentDecimal*10 + (float)[sender tag];
calculatorScreen.text = [NSString stringWithFormat:#"$ %g.%g", currentSavings,currentDecimal];
}
else
{
currentSavings = currentSavings*10 + (float)[sender tag];
calculatorScreen.text = [NSString stringWithFormat:#"$ %g",currentSavings];
}
}
This is my solution:
ViewController.h
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController {
float result;
IBOutlet UILabel *TextInput;
int currentOperation;
float currentNumber;
BOOL userInTheMiddleOfEnteringDecimal;
}
- (IBAction)buttonDigitPressed:(id)sender;
- (IBAction)buttonOperationPressed:(id)sender;
- (IBAction)cancelInput;
- (IBAction)cancelOperation;
- (IBAction)dotPressed;
#end
ViewController.m
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (IBAction)buttonDigitPressed:(id)sender {
if(!userInTheMiddleOfEnteringDecimal)
{
currentNumber = currentNumber*10 + (float)[sender tag];
TextInput.text = [NSString stringWithFormat:#"%d",(int)currentNumber];
}
else{
TextInput.text= [TextInput.text stringByAppendingString:[NSString stringWithFormat:#"%d",[sender tag]]];
currentNumber = [TextInput.text floatValue];
}
}
- (IBAction)buttonOperationPressed:(id)sender {
if (currentOperation == 0) result = currentNumber;
else {
switch (currentOperation) {
case 1:
result = result + currentNumber;
break;
case 2:
result = result - currentNumber;
break;
case 3:
result = result * currentNumber;
break;
case 4:
result = result / currentNumber;
break;
case 5:
currentOperation = 0;
break;
default:
break;
}
}
currentNumber = 0;
TextInput.text = [NSString stringWithFormat:#"%.2f",result];
if ([sender tag] == 0) result = 0;
currentOperation = [sender tag];
userInTheMiddleOfEnteringDecimal = NO;
}
-(IBAction)cancelInput{
currentNumber = (int)(currentNumber/10);
TextInput.text = [NSString stringWithFormat:#"%.2f",currentNumber];;
}
-(IBAction)cancelOperation{
currentNumber = 0;
TextInput.text = #"0";
userInTheMiddleOfEnteringDecimal = NO;
}
- (IBAction)dotPressed{
if(!userInTheMiddleOfEnteringDecimal){
userInTheMiddleOfEnteringDecimal = YES;
TextInput.text= [TextInput.text stringByAppendingString:#"."];
}
}
#end
Hope this helps.. Another way of solution...
after pressing the "." all values after will be divided as following
the first number ur press after pressing "." will be divided by 10 the second by 100 and so on
so editing ur function it would be like this
-(IBAction)buttonDigitPressed:(id)sender{
currentNumber = currentNumber + (float)[sender tag] / 10.0;
calculatorScreen.text = [NSString stringWithFormat:#"%g",currentNumber];
}
i think in that solve your problem
http://www.datasprings.com/resources/articles-information/iphone-sdk-getting-started-example-code
There is sample code of calculator.
-(IBAction) change {
self.imageView.animationImages = myImages;
self.imageView.animationDuration = 2;
if(self.imageView.isAnimating == NO){
[self.imageView startAnimating];
NSLog(#"if bool = %d", self.imageView.isAnimating);
}
else {
self.imageView stopAnimating];
NSLog(#"else bool = %d", self.imageView.isAnimating);
}
}
hello, i'm studying iOS programming.
but i have a question.
i have a button and when i click the button, then this method will be called.
first i click the button, then this code will start the if statement. that's what i want.
i click the button again, i think that will execute the else statement.
but it always execute the if statement only.
why is that?
i really don't know why is that. please help me
I think setting the properties like animationImages or animationDuration will stop the animation, so that by clicking, you every time stop and then just after (re)start it in the if part. Try setting these two properties outside the action method you wrote, and just let the if/else sequence.
-(IBAction) change {
// set these two anywhere else
//self.imageView.animationImages = myImages;
//self.imageView.animationDuration = 2;
if(self.imageView.isAnimating == NO){
[self.imageView startAnimating];
NSLog(#"if bool = %d", self.imageView.isAnimating);
}
else {
self.imageView stopAnimating];
NSLog(#"else bool = %d", self.imageView.isAnimating);
}
}
I've been staring at this issue for the past week. Countless cups of Joe, cats stepping on my keyboard, and girlfriend wanting me to get off of the laptop later - I still can't figure this out. Hoping I'm doing something very stupid (100% chance) that I'm over looking.
I have some code which appends a decimal to the number pad. Most of the code was taken from here (http://brygruver.squarespace.com/blog/2009/10/1/creating-a-custom-number-pad.html?lastPage=true&postSubmitted=true) and I'm using his code but modified it a bit to only append the decimal and image of the decimal to the last two fields of my total five fields.
Here is my code which is showing the decimal image and appending it to the input:
- (void)textFieldDidBeginEditing:(UITextField *)textField {
// We need to access the dot Button declared in the Delegate.
helloAppDelegate *appDelegate = (helloAppDelegate *)[[UIApplication sharedApplication] delegate];
// Only if we are editing within the Number Pad Text Field do we want the dot.
if (textField == txtUserName4) {
// Show the Dot.
appDelegate.dot.hidden = NO;
}
else if (textField == txtUserName5) {
// Show the Dot.
appDelegate.dot.hidden = NO;
}
else {
// Otherwise, Hide the Dot.
appDelegate.dot.hidden = YES;
}
}
- (void)addDecimal:(NSNotification *)notification {
// Apend the Decimal to the TextField.
if (txtUserName4.editing) {
txtUserName4.text = [txtUserName4.text stringByAppendingString:#"."];
}
else if (txtUserName5.editing) {
txtUserName5.text = [txtUserName5.text stringByAppendingString:#"."];
}
here is a video of what's happening (http://screencast.com/t/OTNhODRiYjAt). The decimal isn't showing unless I bring up the alert error, and then it shows correctly for both the fields.
SO, I turned off the field validation and - shocking - the decimal shows on the last two fields (http://screencast.com/t/ZmQyOTc1MT). So it must not be the code showing the decimals but the validation I have.
here is the validation I have. I'm thinking I'm dropping the ball with the text field being nil or being first responder?
- (void)textFieldDidEndEditing:(UITextField *)textField
{
if (textField == txtUserName)
{
NSString *userNameOne = txtUserName.text;
double numOne = [userNameOne doubleValue];
if(numOne < 30 || numOne > 80)
{
//show alert
//release alert
//if there is alert then clear out the field and make that the FR
[txtUserName becomeFirstResponder];
txtUserName.text = nil;
}
else
{
[txtUserName2 becomeFirstResponder];
}
}
else if (textField == txtUserName2)
{
NSString *userNameThree = txtUserName2.text;
float numTwo = [userNameThree doubleValue];
if (numTwo < 20 || numTwo > 32)
{
//show alert
//release alert
//if there is alert then clear out the field and make that the FR
[txtUserName2 becomeFirstResponder];
txtUserName2.text = nil;
}
else
{
[txtUserName3 becomeFirstResponder];
}
}
else if (textField == txtUserName3)
{
NSString *userNameThree = txtUserName3.text;
float numThree = [userNameThree doubleValue];
if (numThree < 475 || numThree > 650)
{
//show alert
//release alert
//if there is alert then clear out the field and make that the FR
[txtUserName3 becomeFirstResponder];
txtUserName3.text = nil;
}
else
{
[txtUserName4 becomeFirstResponder];
}
}
else if (textField == txtUserName4)
{
NSString *userNameFour = txtUserName4.text;
double numFour = [userNameFour doubleValue];
if (numFour < 0.5 || numFour > 3.00)
{
//show alert
//release alert
//if there is alert then clear out the field and make that the FR
[txtUserName4 becomeFirstResponder];
txtUserName4.text = nil;
}
else
{
[txtUserName5 becomeFirstResponder];
}
}
else if (textField == txtUserName5)
{
NSString *userNameFive = txtUserName5.text;
double numFive = [userNameFive doubleValue];
if (numFive > 0.80)
{
//show alert
//release alert
//if there is alert then clear out the field and make that the FR
[txtUserName5 becomeFirstResponder];
txtUserName5.text = nil;
}
else
{
[txtUserName5 resignFirstResponder];
}
}
}
I'm really stumped but at least figured out it's something with my validation mixing things up...
EDIT:
I found out if I comment out the else that makes the next field the first responder, then everything works as it should.
With that said, does removing the else really hurt anything in my validation? This entire validation was made with the idea of using the 'done' and 'next' buttons back when I was using the basic keyboard. Now, I'm seeing that my entire validation code is lacking a bit :)
Most likely when you call -becomeFirstResponder, the keyboard is getting redrawn, which likely is pushing the keyboard view above your magical "dot" view that is supposed to be floating on top. You probably need to call -bringSubviewToFront: with your "dot" view whenever you switch first responder.
I've been researching this for a few days now, and would appreciate a little help. Is there any way to generate a multi-line UITextField like Apple use in the SMS application? The useful thing about this control is that it has the 'sunk' appearance that makes it clear that it is a text entry box, but at the same time, it expands on each new-line character.
Failing that, if I'm forced to use a UITextView, can anyone advise how best to dismiss the keyboard ? Both the 'Done' and the 'Go' buttons just appear to generate newline characters ('\n'). This seems wrong to me - surely at least one of these should generate a different character, so that I can still allow for newline characters, but also dismiss my keyboard on a specific key press.
Am I missing something simple here ?
Thanks in advance :)
Maybe you can build upon a class I wrote? It's the same as tttexteditor, without the ugly glitches: http://www.hanspinckaers.com/multi-line-uitextview-similar-to-sms
An old question, but after several hours I've figured out how to make it the same perfectly as in Instagram (it has the best algorithm among all BTW)
Initialize with this:
// Input
_inputBackgroundView = [[UIImageView alloc] initWithFrame:CGRectMake(0.0f, size.height - _InputBarHeight, size.width, _InputBarHeight)];
_inputBackgroundView.autoresizingMask = UIViewAutoresizingNone;
_inputBackgroundView.contentMode = UIViewContentModeScaleToFill;
_inputBackgroundView.userInteractionEnabled = YES;
[self addSubview:_inputBackgroundView];
[_inputBackgroundView release];
[_inputBackgroundView setImage:[[UIImage imageNamed:#"Footer_BG.png"] stretchableImageWithLeftCapWidth:80 topCapHeight:25]];
// Text field
_textField = [[UITextView alloc] initWithFrame:CGRectMake(70.0f, 0, 185, 0)];
_textField.backgroundColor = [UIColor clearColor];
_textField.delegate = self;
_textField.contentInset = UIEdgeInsetsMake(-4, -2, -4, 0);
_textField.showsVerticalScrollIndicator = NO;
_textField.showsHorizontalScrollIndicator = NO;
_textField.font = [UIFont systemFontOfSize:15.0f];
[_inputBackgroundView addSubview:_textField];
[_textField release];
[self adjustTextInputHeightForText:#""];
Fill UITextView delegate methods:
- (void) textViewDidBeginEditing:(UITextView*)textView {
[self adjustTextInputHeightForText:_textField.text];
}
- (void) textViewDidEndEditing:(UITextView*)textView {
[self adjustTextInputHeightForText:_textField.text];
}
- (BOOL) textView:(UITextView*)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString*)text {
if ([text isEqualToString:#"\n"])
{
[self performSelector:#selector(inputComplete:) withObject:nil afterDelay:.1];
return NO;
}
else if (text.length > 0)
{
[self adjustTextInputHeightForText:[NSString stringWithFormat:#"%#%#", _textField.text, text]];
}
return YES;
}
- (void) textViewDidChange:(UITextView*)textView {
[self adjustTextInputHeightForText:_textField.text];
}
And the trick is...
- (void) adjustTextInputHeightForText:(NSString*)text {
int h1 = [text sizeWithFont:_textField.font].height;
int h2 = [text sizeWithFont:_textField.font constrainedToSize:CGSizeMake(_textField.frame.size.width - 16, 170.0f) lineBreakMode:UILineBreakModeWordWrap].height;
[UIView animateWithDuration:.1f animations:^
{
if (h2 == h1)
{
_inputBackgroundView.frame = CGRectMake(0.0f, self.frame.size.height - _InputBarHeight, self.frame.size.width, _InputBarHeight);
}
else
{
CGSize size = CGSizeMake(_textField.frame.size.width, h2 + 24);
_inputBackgroundView.frame = CGRectMake(0.0f, self.frame.size.height - size.height, self.frame.size.width, size.height);
}
CGRect r = _textField.frame;
r.origin.y = 12;
r.size.height = _inputBackgroundView.frame.size.height - 18;
_textField.frame = r;
} completion:^(BOOL finished)
{
//
}];
}
Facebook has released an open-source package called Three20 that has a multi-line text field. You can use this pretty easily for an expanding text field.
As for the "Done" button, you can set your view controller as a UITextFieldDelegate. Then use this method:
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
// Do whatever you want for your done button
return YES;
}
In the case of Three20, use this method of TTTextEditorDelegate:
- (BOOL)textFieldShouldReturn:(TTTextEditor *)textField {
// Do whatever you want for your done button
return YES;
}
Well, I had a similar problem, and what I ended up using is actually create a disabled UITextField as the background and a UITextView above it to get the input... It sucks that iPhone API cannot have this by default. Also note that this does not auto-expand, but you can do this if you want by handling the textViewDidChange:
As for handling the return key, try implementing the following method from the UITextViewDelegate:
- (void)textViewDidChange:(UITextView *)inTextView {
NSString *text = inTextView.text;
if ([text length] > 0 && [text characterAtIndex:[text length] -1] == '\n') {
inTextView.text = [text substringToIndex:[text length] -1]; // remove last return from text view
[inTextView resignFirstResponder]; // hide keyboard
}
}
(void)textEditorDidBeginEditing:(TTTextEditor *)textEditor {
And
(void)textEditorDidEndEditing:(TTTextEditor *)textEditor {
might be what you're looking for. Enjoy!