Question

I’m using UIGestureRecognizer for the first time and I want my app to run on iOS 3.0 onwards.
Since Apple clearly states that the library is available in iOS 3.2 and later I used the following code:

// Make sure that Gesture recognition technology is supportted by the device SDK version
if ([UIGestureRecognizer instancesRespondToSelector:@selector(initWithTarget:action:)])
{
    [self initGestureRecognizers];
}

Surprisingly, when I run the App on the only target I have, that run SDK3.0, it works fine.

---

I replaced the condition to the following:

if ([[[UIDevice currentDevice] systemVersion] compare:@"3.2"] != NSOrderedAscending) 
{ 
    [self initGestureRecognizers]; 
}

I would love to get comments about it.

Thanks

Answer 1

That’s probably because UIGestureRecognizer was considered private before 3.2. Don’t be surprised if some things are buggy or don’t quite work as expected if you use UIGestureRecognizer under 3.0.