It's me again.
Thanks Roland for your advices.
Now, I have actually realized a way to handle touches and scrolling
methods at the same time.
Inside my UITextView subclass I wrote the touch regarding methods
implementation.
Then Inside the UIViewController subclass (wich has a instance of the
UITextView subclass as a member - myViewer - ) I adopt
UIScrollViewDelegate protocol.
and wrote something like tthis inside viewDidLoad inside the
controller's implementation:
self.myViewer.delegate = self
With this approach, I can handle both (touches and scrolling) but
there is a big problem.
Since I am writing touches regarding methods inside UITextView
subclass It is kind of difficult to implement what I am trying to do.
I mean, I would have to write the same code as the controller inside
the viewer in order to get them to work. (I don't think this is the
best way to do it)
(At this moment i am just working only with 1 instance of UITextViewer
subclass but I am planning to use actually 2, so my code would be 3
times longer??)
Everything would be easier if I could handle touches regarding methods
from the controller and not from the viewer. Is there any way to
"delegate" touches methods to the controller? Or maybe, an easy way to
access the controller from its member ?
On Sun, Nov 2, 2008 at 1:21 PM, Roland King <[EMAIL PROTECTED]> wrote:
> yes there seems to be some confusion here.
>
> 1) the delegate for a UITextView is a UITextViewDelegate, the
> UIScrollViewDelegate is irrelevant.
>
> 2) It may well be that UITextView itself is a delegate of a scroll view
> behind the scenes and your override of its delegate method
> scrollViewDidScroll: is getting called giving you access to the UIScrollView
> delegate events, but that's not documented (as far as I can tell) so you
> shouldn't rely on it. I can't see anywhere in the documentation that a
> UITextView exposes any underlying scroll events. Also, you're not calling
> the superclass implementation, which would probably break the UITextView
> anyway.
>
> 3) Your implementation header for EVTextViewController says it implements
> the delegate protocols, but you've actually implemented them on the
> EVLessonTextView. That's why you get a warning when you assign the
> EVLessonTextView to the delegate, it doesn't implement the correct protocol
> or rather it does, but the compiler doesn't know that. When you set it to
> 'self' (ie an EVTextViewController) you don't get a warning because you've
> declared that the EVTextViewController does implement the delegate
> protocols, but you don't get any calls because it doesn't actually implement
> the methods, your other class does. You either need this
>
> @interface EVLessonTextView <UITextViewDelegate>
> @end
>
> @implementation EVLessonTextView
> .. UITextViewDelegate Methods here ...
> @end
>
> and then assign textView.delegate = textView
>
> OR
>
> @interface EVTextViewController <UITextViewDelegate>
> @end
>
> @implementation EVTextViewController
> ... UITextViewDelegate Methods here ..
> @end
>
> with textView.delegate = self
>
>
> see how you've mixed up the two, declaration in one class, implementation in
> the other. The compiler warning was helping you.
>
> 4) repeating 2). I don't think the information you want is exposed by
> UITextView, ie I don't think it tells you where it's scrolled to, if it's
> scrolled at all. The underlying UIScrollView isn't exposed. I think if you
> want to reliably get that information you need to write your own subclass of
> UIScrollView to display text.
>
> Note:
>
> It does bother me a bit that both UIScrollView and UITextView (which
> inherits from it) both have a delegate property and it's of a different type
> in each class (id<UIScrollViewDelegate> vs id<UITextViewDelegate>), I
> thought if you subclassed something and tried to change the type of one of
> its properties, you got a compiler warning.
>
>
> On Nov 2, 2008, at 12:23 AM, Ignacio Enriquez wrote:
>
>> Hello everyone,
>>
>> I am quite new in implementing Delegates protocols and assignating
>> them. And I am having some kind of problems here.
>>
>> I am trying to get the exact position of a text (using offset method
>> of UITextView) when scrolled
>> for that reason I have decide to adopt UIScrollViewDelegate and
>> implemented , let's say -
>> (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
>>
>> And at the same time I have to be able to respond to touches. That's
>> is why I have decided to subclass UITextView , a class named
>> EVLessonTextView, and write touch methods like -
>> (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event inside
>> there.
>>
>> And a text view controller class that has some info like, the text to
>> be shown, the current text position and whether text viewer has been
>> touched or not.
>>
>> The problem is, my app does not respond as expected. I think is has
>> something to be with assignation of delegates.
>> This a short version of what I wrote. But I hope I can learn from this.
>>
>> Could you tell me what am I mistaking in?
>>
>> // text view
>> @interface EVLessonTextView : UITextView {
>> NSNumber * currentPosition;
>> }
>>
>> @end
>> @implementation EVLessonTextView
>> - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
>> {
>> NSLog(@"Ouch!!, text has been touched");
>> [super touchesBegan:touches withEvent:event];
>> }
>> - (void)scrollViewDidScroll:(UIScrollView *)scrollView{
>> NSLog(@"view didScroll!!, current position has been calculated");
>> }
>>
>> //text view controller
>> @interface EVTextViewController : UIViewController
>> <UITextViewDelegate, UIScrollViewDelegate> {
>> IBOutlet EVLessonTextView * textView;
>> NSNumber *currentTextPosition;
>> Boolean *textHasBeenTouched;
>> }
>>
>> - (void)viewDidLoad {
>> [super viewDidLoad];
>>
>> textView.delegate = textView; // GETS A WARNING here,
>> EVLessonTextView does not implement UITextViewDelegate protocol
>> textView.text = @"super ultra long scrollable text content";
>>
>> textView.editable = NO;
>>
>> }
>>
>>
>> in the part I get a warning, If write
>> textView.delegate = textView
>> then only scroll methods works fine, but I have a warning
>>
>> if I change it to
>> textView.delegate = self
>> then I got nothing, not warning, but not scrolling methods and not
>> even touches methods.
>>
>> What is wrong?
>> I am kind of stacked here.
>>
>> Thanks in advance for your help.
>>
>> Ignacio
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>
--
_____________________________________________
Guillermo Ignacio Enriquez Gutierrez
Shibaura Institute Of Technology
Faculty of Engineering
Department of Information Science & Engineering
Senior Student
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