[iPhone] UIScrollView responder chain problems
I have a view hierarchy something with a UIImageView as a subview of a UIScrollView as a subview of my view controller's view.
According to the documentation, the each object in the responder chain is supposed to pass a touch event to it's view controller (if it has one, and then onto it's superview). So, if I tap the uiimage, the touch event should eventually get passed up to the top level view controller where I can handle it.
Well, it's not working....the event never reaches the top level. Only touches on direct subviews of the top view are received by the controller.
Does this work for anyone else, with a similar hierarchy ? Are there any good techniques or tools for debugging the responder chain ?
Hello -
I faced a similar issue.
I used the following to force my UIView to report to its parent UIScrollView:
[self.nextResponder.nextResponder touchesBegan:touches withEvent:event];
I am not exactly sure why but I had to jump one "nextResponder" to go directly to the one above.
This is all quite obscure to me; but somehow it seems to work....
BTW, it is possible to check "who is who" using:
NSLog(@"%s",[self.nextResponder.description cStringWithEncoding:1]);
(self-made probably-quite-primitive trick...)
Hope that helps.
S
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New here, in fact new to the SDK but getting on well with it (plenty of previous coding experience to draw on). However, I've been hitting my head against a brick wall with UIScrollView and it making subviews, e.g. UIImageViews, no longer be touchable. When I move the image views outside the scroll view it's fine, so I know they're working and the touchesBegan:withEvent is processing as it should do.
Here's what I'm doing in the initWithFrame:
scroller = [[UIScrollView alloc] initWithFrame:CGRectMake(0,0,320,400)];
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And then the image views:
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buttonPlay.image = [UIImage imageNamed:@"blah.jpg"];
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Basically no touch events are being generated anywhere I click within the scroll view and I'm at a loss to work out why.
Not sure if it's related either but I can't get a UILabel to respond to a touch either, even though I've enabled userInteractionEnabled for it - even trying a simple project I can't get a UILabel to generate a touch event at all.
Any help on the above scroll view issue would be appreciated as it's driving me nuts!
CheersUIScrollView must not pass these events up the responder chain. I'm not sure if this is intended behavior, but it seems like it might be (if so the docs should be updated). I took my test code and verified:
1. scroller's nextResponder points the UIView of the ViewController.
2. That UIView has a nextResponder pointing to the ViewController
This is what you would expect from the docs on the UIResponder Chain. However, it relies on each UIView subclass to pass the event up the responder chain +if it isn't handled fully+. UIScrollView must be making the assumption that "the buck stops here". Hence your touchesBegan: in your viewController never gets the message.
Further, a little more testing with this at the end of viewDidLoad:
BOOL status1 = [scroller canResignFirstResponder];
BOOL status2 = [scroller resignFirstResponder];
BOOL status3 = [self.view becomeFirstResponder];
showed me:
status1 = NO
status2 = NO
status3 = NO
I'd say UIScrollView likes the power it wields . -
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Hello,
I'm quite new in iPhone developement and in Objective-C programming, and I am not very good (of course I'm French :)).
I'm sure my problem is simple, but I can't find a clear response in the doc and on the Web..
I have a custom view which implements the touchesBegan, touchesMoved, and touchesEnded methods in order to handle touch screen events. For a clear separation between View and Control (MVC pattern), I want to delegate these events to another class which inherits from the UIResponder class. How can I do that ?
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tengo el iphone 5 y mi problema es que mis mensajes de texto estan siendo compartidos con otro telefono que usa mi misma apple id ,necesito borrar mi cuenta y crear una cuenta nueva, como hago?
Tiene razon Zeruelrojo, apple es una mierda, tengo 208 pesos, queria gastarlos en aplicaciones, antiguamente usaba mi cuenta y compraba en 1 ipod touch 2g y sin problemas, adquiri 1 iphone 3g de 8gb, asocie mi cuenta con el dispositivo y hasta ahi no habia problemas, pero a la hora de comprar aplicaciones o accesorios dentro de las apps, me pide que responda preguntas que no recuerdo haber agregado en mi cuenta de apple, y dije ok no hay problema, debe haber 1 forma de resetearlas, y si la hay, pero a la hora que revise mi contacto de recuperacion veo que el correo ya esta dado de alta y no es el mismo de mi cuenta
veo que el correo es el siguiente
SOY DE MÉXICO, cuando carajos agregue un correo de españa? la terminacion en la imagen se muestra ".es"
ahora, tiene que haber 1 forma de resetear ese correo, andube buscando y no la hay al parecer, todo tiene que ser por soporte tecnico o de alguna manera, lo que le estan haciendo a los usuarios como nosotros, que hacemos TODO LEGAL
practicamente me estan negando el hacer uso de mi dinero y eso me enoja y me molesta, escribo esto en domingo 07/abril/2013
mañana hablare directamente con alguien de soporte tecnico....
si no me resuelven mi problema pueden olvidarse de que siga consumiendo tanto productos como dinero electronico.
les sugiero que hagan lo mismo, ya que esto para 1 demanda se que no haran nada.
podran ver que si nos unimos quizas en 1 futuro hagan algo al respecto.
Soy tecnico informatico y el servicio tecnico que ofrecen es una mierda, disculpen mi vocabulario pero eso es.....
esta mal estructurado y mal hecho su servicio de ayuda al cliente.
saludos desde querétaro méxico.
<Email Edited by Host> -
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This is my first Mac OS X Cocoa application. I am trying to create a menu item that will grab information from a document window, do something with that info, and then close the window.
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sheraz mumtazHey Ocean20! Hope you Aussies had a lovely day celebrating Anzac Day!
Does that mean you got to have a day off from work?
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Has anyone upgraded from a 3GS to a 4S and found the music level in a car via bluetooth much quieter, the same or louder and does this sound like a hardware problem.
thanks.Funny Apple told me to eat **** and call my car place.
HELP !!!
It’s not like we are working with Samsun here. They should have thought it out fixed all the bugs then went ahead. I am...... ******! My 3 week old Volkswagen Tiguan no longer plays my MUSIC nor my Audible. Its so not ok. This is a breach of contract. I am told by apple you don’t have to update but my carrier said just the opposite our phones will not work without the updates...
Apple get you crap together, I had such respect you. You have let a lot of apple fans down.
A very ****** ex Apple Fan
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