UITextView delegate methods

Question

I am trying to get delegate methods to work with UITextView, but it's not working for some reason.

I have declared in my viewController.h that it is a UITextViewDelegate

I am trying to get the following code to work to erase the default code "TEXT" when I tap on the textView.

- (void)textViewDidBeginEditing:(UITextView *)textView {

    if (myTextView.text == @"TEXT") {
        [myTextView setText:@""];
    }

    NSLog(@"did begin editing");
}

I expected to the text to be cleared and to see the NSLog print when I tap on the textView and the keyboard appears. Nothing at all happens

---

Using a text view by the way because I need to scale the view based on its content size and seems that the textView has a contentSize property, whit label and textField do not.

UPDATE:

I should have used:

if ([myTextView.text isEqualToString:@"TEXT"]) {
    [myTextView setText:@""]; }

here is the project if you want to take a look.

Solution 1

this method is missing from your Test2ViewController.m file:

- (void)viewDidLoad {
    [myTextView setDelegate:self];
}

or you can connect the delegate in the Interface Builder as well, if you prefer that way better.

UPDATE #1:

add this method to you class for controlling the return key.

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
    if ([text isEqualToString:@"\n"]) {
        NSLog(@"Return pressed, do whatever you like here");
        return NO; // or true, whetever you's like
    }

    return YES;
}

Solution 2

Connect the delegate of the TextView in Interface Builder to the parent class. I like to use the connection in IB rather than code it. To me the less code to look at the better :). Also - don't compare strings that way. Use isEqualToString for string comparison:

if ([myTextView.text isEqualToString:@"TEXT"]) {
        [myTextView setText:@""];
}

Here is the fixed project:

Solution 3

I think I have a good solution in principle:

Set the UITextView's delegate to self and then make your own delegate - re-using the same name. This allows you to intercept the delegate without anything looking different from the outside

@interface TTGTextView : UITextView<UITextViewDelegate>// UIPlaceHolderTextView
@property(nonatomic, assign) id<UITextViewDelegate> delegate;
@synthesize delegate = realDelegate;

Then go ahead and intercept the methods. Note that you need to cover all of them, otherwise they won't react the "real" delegate

-(void)textViewDidBeginEditing:(UITextView *)textView
{
  if ([realDelegate respondsToSelector:@selector(textViewDidBeginEditing:)])
    [realDelegate textViewDidBeginEditing:textView];
  /*YOUR CODE HERE*/
}
-(void)textViewDidChange:(UITextView *)textView
{
  if ([realDelegate respondsToSelector:@selector(textViewDidChange:)])
    [realDelegate textViewDidChange:textView];
  /*YOUR CODE HERE*/
}
-(void)textViewDidChangeSelection:(UITextView *)textView
{
  if ([realDelegate respondsToSelector:@selector(textViewDidChangeSelection:)])
    [realDelegate textViewDidChangeSelection:textView];
  /*YOUR CODE HERE*/
}
-(void)textViewDidEndEditing:(UITextView *)textView
{
  if ([realDelegate respondsToSelector:@selector(textViewDidEndEditing:)])
    [realDelegate textViewDidEndEditing:textView];
  /*YOUR CODE HERE*/
}

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
  if ([realDelegate respondsToSelector:@selector(textView:shouldChangeTextInRange:replacementText:)])
    return [realDelegate textView:self shouldChangeTextInRange:range replacementText:text];
  return YES;
}
-(BOOL)textView:(UITextView *)textView shouldInteractWithURL:(NSURL *)URL inRange:(NSRange)characterRange
{
  if ([realDelegate respondsToSelector:@selector(textView:shouldInteractWithTextAttachment:inRange:)])
    return [realDelegate textView:self shouldInteractWithURL:URL inRange:characterRange];
  return YES;
}
- (BOOL)textView:(UITextView *)textView shouldInteractWithTextAttachment:(NSTextAttachment *)textAttachment inRange:(NSRange)range
{
  if ([realDelegate respondsToSelector:@selector(textView:shouldInteractWithTextAttachment:inRange:)])
    return [realDelegate textView:textView shouldInteractWithTextAttachment:textAttachment inRange:range];
  return YES;
}

Some of the methods fire correctly, others don't fire for me at all but immediately appear for the "real" delegate. But this is a starting point. I guess a more solid and general way would be to make some kind of multiplexer - make it a UITableViewDelegate which holds an array of delegates to fire to.

Solution 4

Your UITextview needs to be told where its delegate methods lies...

If you add it via interface builder then simply connect the delegates

or if via code

[yourTextViewOutlet setDelegate:self];

Solution 5

Deponds on your View. if you use TextField, you should be used UITextFieldDelegate in .header file as a delegate just like show below.

@interface ExamPageViewController : UIViewController <UITextFieldDelegate>

and than we can be used UITextFieldDelegate methods. You can see;

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    [self.questionAnswerTextField resignFirstResponder];
    return YES;
}

-(void)textFieldDidBeginEditing:(UITextField *)textField {

    if ([textField.text isEqualToString:@"Sorunun cevabını buraya yazınız!"]) {
        textField.text = @"";
    }
}


- (void)textFieldDidEndEditing:(UITextField *)textField {
    if ([textField.text isEqualToString:@""]) {
        textField.text = @"Sorunun cevabını buraya yazınız!";
    }
}

Otherwise you should be used UITextViewDelegate as a delegate like below code snippet.

@interface ExamPageViewController : UIViewController <UITextViewDelegate>

and than we can be used these delegate methods in .m file

- (BOOL)textViewShouldReturn:(UITextView *)textField {
    [self.questionAnswerTextField resignFirstResponder];
    return YES;
}

-(void)textViewDidBeginEditing:(UITextView *)textField {

    if ([textField.text isEqualToString:@"Sorunun cevabını buraya yazınız!"]) {
        textField.text = @"";
    }
}


- (void)textViewDidEndEditing:(UITextView *)textField {
    if ([textField.text isEqualToString:@""]) {
        textField.text = @"Sorunun cevabını buraya yazınız!";
    }
}

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Comments

[LJ Wilson]

Also, I updated my answer to correct your string comparison and changed the project. Download the updated project.

[Mr Ordinary]

Thanks that worked! One more question. Is it possible to have the return key make the textView resign first responder. There is no method as I can see.