iOS Objective C: How to be notified when the user taps on the spacebar?

Question

I have been working on this now for a few days and haven't had any luck. I have a text to speech app and I need to trigger a method in my code every time the user taps on the spacebar. So they will be typing and after every word they tap the spacebar and the app will do something. I found a few examples here that seem to be similar, but I haven't gotten them to work. I have implemented the code suggested, as you can see below, but I do not receive any response. Here is what I have tried.

-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{
    if([self.myTextView.text isEqualToString:@" "]) {
        /* do something  */
        NSLog(@"YES YES YES");
    }
    return YES;
}

I also tried setting up a notification center alert as follows:

[[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(textViewText:)
                                                 name:UITextViewTextDidChangeNotification
                                               object:self.myTextView];

- (void)textViewText:(NSNotification *)notification {        
    if([self.myTextView.text isEqualToString:@" "]) {
        /* do something  */
        NSLog(@"YES YES YES");
    }    
}

Neither of these trigger the NSLog. This is what I basically need to do:

if(the user taps the spacebar) {
   [self trigger the play method];
}

Any help will be greatly appreciated. If it makes a difference, my app is 100% free, has no ads and is used by a lot of people with ALS and other diseases and have lost their ability to speak.

score 2 · Accepted Answer · answered Jan 26 '17 at 07:05

2

In textView:shouldChangeTextInRange:replacementText: replace if([self.myTextView.text isEqualToString:@" "]) { with if([text isEqualToString:@" "]) {. The new text that the user just entered is text and self.myTextView.text is the text that was already there.

answered Jan 26 '17 at 07:05

Jon Rose

8,373
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I also tried this and unfortunately it doesn't generate a response. – d.altman Jan 26 '17 at 21:36
1

I figured it out. I had to set myTextView.delegate to self in viewDidLoad. That was my problem. Thank you again. – d.altman Jan 27 '17 at 07:25

score 2 · Answer 2 · answered Jan 26 '17 at 07:06

2

Try this

- (void)textViewText:(NSNotification *)notification {
    UITextField *obje = notification.object;
    if([obje.text isEqualToString:@" "]) {
        /* do something  */
        NSLog(@"YES YES YES");
    }
}

answered Jan 26 '17 at 07:06

karthikeyan

3,821
3
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I tried this but unfortunately it doesn't work. But thank you for the input. – d.altman Jan 26 '17 at 21:34
Okay,otherewise try perform selector on main thread. – karthikeyan Jan 27 '17 at 03:37

iOS Objective C: How to be notified when the user taps on the spacebar?

2 Answers2