On Jun 23, 2015, at 10:50 PM, Kyle Sluder wrote:
>> On Jun 23, 2015, at 7:31 PM, Alex Zavatone <z...@mac.com> wrote:
>
>>
>>
>> On Jun 23, 2015, at 9:27 PM, Kyle Sluder wrote:
>>
>>>> On Jun 23, 2015, at 6:10 PM, Alex Zavatone <z...@mac.com> wrote:
>>>>
>>>> Actually, the rotate event is the one that is being caught and sent.
>>>>
>>>> If it's a UIEvent and it's listed as a UIInternalEvent, within the
>>>> debugger, how do I check the type and subtype to see what type of event it
>>>> is so that I can return immediately if it is the wrong type?
>>>
>>> I don’t understand the question. Or rather, I understand the question, but
>>> I don’t understand why you are asking it.
>>
>> Because an exception is thrown in that case and I'd prefer to return before
>> my app quits.
>
> It’s your code that’s throwing the exception, right? Or are you saying that
> UIKit is throwing an exception if you ask for the .type of a UIEvent that it
> hands you, if that object just so happens to be an instance of a private
> subclass?
>
>>
>>> There are three public types of event: Touches, Motion, and RemoteControl.
>>> Are you saying that UIInternalEvents are re-using one of these constants,
>>> and therefore you need an alternative way to disambiguate them? That’s
>>> definitely a problem and you should file a Radar.
>>
>> I'm saying "I want to see which event it is and return if it is a motion
>> event".
>
> Assuming the exception is being thrown by your code, stop doing that and just
> check the event’s .type. If it isn’t equal to Motion, skip it.
>
It's not being thrown by my own code. It's a rotate event that's being sent by
the system.
I did that. I'm telling you that "it doesn't work".
The event's type doesn't match the enums. The event's type doesn't match any
enum that I know of. I'm asking "how can I check this?"
All I can get is a -1 of type and a 0 of subtype for any event that's sent
through this event catching class that I had no part in writing. I'm trying to
see what type of event this is so I can exit gracefully before the app blows up
on me in this special case.
>>
>>>
>>> If you just want to spelunk around the innards of a private UIEvent
>>> subclass, then no. We will not provide you information to do so.
>>>
>>> Barring that, just do if (event.type==UIEventTypeMotion) { } else if
>>> (event.type==UIEventTypeTouches) { } …
>>
>> Yeah, I tried that. The event.type is returning -1 and isn't matching any
>> of the 3 UIEventType enum values. It's not matching on any of them.
>
> There is no guarantee that the event type will be a member of the public
> enum. Your code needs to be prepared for this case. A future OS might add a
> new event type. You don’t want your existing, shipping apps to blow up when
> the user upgrades their OS.
>
> --Kyle Sluder
Um, but I'm asking "how can I prepare for this case?"
This is for a motion event. The OS is throwing the event. I'm not. My code
is not. It's being sent when I turn the device. There is no orientation code
in my viewController or nav controller. If I'm wrong and there is another thing
I should be checking for besides the UIEventType enums (sorry, not in front of
that computer at the moment), can you please give me a hint as to what I should
check against?
The app is already blowing up in one case with a UIEvent being sent to super
which is UIApplication. This causes a bad access exception that I'd like to
stop from bringing down my app. I have no code that's causing the event to be
sent, it's being done by the system and in this class that I didn't write that
catches all events, I'd like to determine which type of event this is and exit
before my app explodes and dies in a fire.
Do you have any suggestions how might I go about doing that?
For a UIEvent that is issued by the system as a result of rotating the iOS
device and is showing itself as a UIInternalEvent in the debugger, if checking
for (event.type==UIEventTypeMotion) { } else if
(event.type==UIEventTypeTouches) {} … fails, how can I determine the event type
so I can have my app not throw an exception?
The problem here is that the exception is being raised within an @try block and
it is not being caught by @catch. The exception is raised on [super
sendEvent:event]; only in the case of a device rotation.
It's this
@try {
[super sentEvent:event];
}
@catch (NSException *exception){
NSLog(@"Exception: %@",exception);
}
It never gets to @catch. The stack trace tells me it's a call out from purple
from a device rotation. This is why I'm trying what you suggested. As far as
I can tell, this is how you are supposed to check for an event's type.
How else might you suggest escape from the condition before the exception is
thrown if I can't check the event's type?
Thanks much.
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