multi-touch | 易学教程

UIPinchGestureRecognizer position the pinched view between the two fingers

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问题 I successfully implemented a pinch a zoom of a view. However, the view doesn't position itself where I wished it to be. For the stackoverflowers with an iPad, I would like my view to be centered like on the iPad Photos.app : when you pinch&zoom on an album, the photos present themselves in a view that is expanding. This view is approximately centered with the top right hand corner on the first finger and the bottom left hand finger on the other finger. I mixed it with a pan recognizer, but

Multiple button presses for Android 2.x

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问题 I am relatively new to this still, and I have been developing a small app that would benefit greatly from a user being able to press 2 buttons at one time. What is the best method for achieving this? I dont think that an OnClickListener works like that, and I have seen examples for doing this with an OnTouch event. However, I do not know how to set up button presses with an OnTouch event. 回答1: You would have to handle touch events yourself. With the multi-pointers (aka multi-touch) API it's

Multi-touch gesture in Sprite Kit

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问题 I'm working in Swift with Sprite-Kit using XCode 6, and I have many different nodes but for the moment I only manage to detect one finger and move one node at the same time. I want to know how could I manage to detect multiple fingers in order to move multiple nodes at the same time. My actual code is : var location = CGFloat() // finger position var actualNode = -1 // node touched by the finger, -1 means no node touched override func touchesBegan(touches: NSSet, withEvent event: UIEvent) //

jQuery - draggable images on iPad / iPhone - how to integrate event.preventDefault();?

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问题 I use jQuery, jQuery UI and jQuery mobile to build a web application for iPhone / iPad. Now I create images and they should be draggable, so I did this: <!DOCTYPE html> <html> <head> <meta http-equiv=\"Content-type\" content=\"text/html; charset=utf-8\"> <title>Drag - Test</title> <link rel=\"stylesheet\" href=\"http://code.jquery.com/mobile/1.0a2/jquery.mobile-1.0a2.min.css\" /> <script src=\"http://code.jquery.com/jquery-1.4.4.min.js\"></script> <script src=\"http://code.jquery.com/mobile/1

Disable or prevent multitouch in Activity

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问题 I have several Views on an Activity which a user wants to touch quickly in succession and I capture these touches using a TouchListener and handling MotionEvent.ACTION_DOWN . However, if the user is using two hands, it\'s very likely that the next View will be \'Touch\'ed before the user pulls the previous finger up. In this scenario, a MotionEvent.ACTION_MOVE is fired for the first view rather than the desired MotionEvent.ACTION_DOWN for the second view. Is there any way to work around or

Observing pinch multi-touch gestures in a UITableView

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问题 I am looking to implement a pinch in/out on top of a UITableView, I have looked at several methods including this one: Similar question But while I can create a UIViewTouch object and overlay it onto my UITableView, scroll events are not being relayed to my UITableView, I can still select cells, and they respond properly by triggering a transition to a new ViewController object. But I can not scroll the UITableView despite passing the touchesBegan, touchesMoved, and touchesEnded events. 回答1:

enable/disable zoom in Android WebView

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问题 There are some methods in WebSettings related to zoom: WebSettings.setSupportZoom WebSettings.setBuiltInZoomControls I noticed they work differently on some devices. For example, on my Galaxy S pinch to zoom is enabled by default, but on LG P500 it is disabled (And now I don\'t know how to enable ONLY pinch to zoom, but hide zooming buttons). On P500 when I call setBuiltInZoomControls(true) I get both these variants working (multitouch and buttons). How to enable multitouch zoom and disable