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iphoneobjective-cioscocoa-touch
Peter Warbo
Peter Warbo

Reputation: 11690

Objective-C – Options for handling touch events in Cocoa-Touch

So I believe there are numerous options for handling touch events when programming for the iDevices. A few of the options that I have come a cross are UITapGestureRecognizer and of course using UIButtons. Are there anymore options? What options are most suitable to use? Perhaps someone has a link to a guide or a tutorial that sums this up?

Cheers,

Peter

Upvotes: 0

Views: 972

Answers (3)

omz
omz

Reputation: 53551

1) Target-action: UIControl (UIButton is a subclass of that) provides some built-in touch handling by adding a target and action for certain types of touch events. Example:

[myButton addTarget:self 
             action:@selector(buttonTapped:) 
   forControlEvents:UIControlEventTouchUpInside];

2) Overriding the UIView methods touchesBegan:withEvent:, touchesMoved:withEvent:, touchesEnded:withEvent: and touchesCancelled:withEvent: – Provides very fine-grained control but can be difficult to use for complex multitouch handling.

3) Gesture recognizers (since iOS 3.2): Recognition of multitouch (or single touch) gestures that are usually comprised of multiple touch events. The built-in gesture recognizers provide support for recognizing taps, pinches, rotation gestures, swipes, panning and long presses. It's also possible to create custom gesture recognizers for more complex gestures.

All the gesture recognizer subclasses are customizable to a certain degree, e.g. you can specify a minimum number of taps and touches for a UITapGestureRecognizer.

Generally, gesture recognizers can both provide discrete events (like a tap) and continuous events (like a rotation that changes its angle over time).

Upvotes: 3

Simon
Simon

Reputation: 9021

I'd use the UIGestureRecognizers for specific gestures (pan, pinch etc) or the touch handling methods which are inherited from UIResponder class (in UIViewController for instance)....

– touchesBegan:withEvent:
– touchesMoved:withEvent: 
– touchesEnded:withEvent: 
– touchesCancelled:withEvent:

There are a LOT of resources on handling touches in Cocoa-touch. Just google it or even search here on this site for specifics.

Upvotes: 0

dtuckernet
dtuckernet

Reputation: 7895

The best resource by far is the WWDC 2011 Video on Multi-Touch (requires a developer account):

http://developer.apple.com/itunes/?destination=adc.apple.com.8270634034.08270634040.8367260921?i=1527940296

This goes over using both gesture recognizers as well as custom touch handling.

Upvotes: 0

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