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Touch Input

Touch Input

Navigation applications support touch events like single taps, double-taps, panning, and pinch gestures. You can use the SDLTouchManager class to get touch events, or you can manage the touch events yourself by listening for the SDLDidReceiveTouchEventNotification notification.

Note

You must have a valid and approved appId from an OEM in order to receive touch events.

Using SDLTouchManager

SDLTouchManager has multiple callbacks that will ease the implementation of touch events. You can register for callbacks through the stream manager:

Objective-C
self.sdlManager.streamManager.touchManager.touchEventDelegate = self
Swift
sdlManager.streamManager.touchManager.touchEventDelegate = self
Note

The view passed from the following callbacks are dependent on using the built-in focusable item manager to send haptic rects. See supporting haptic input "Automatic Focusable Rects" for more information.

The following callbacks are provided:

Objective-C
- (void)touchManager:(SDLTouchManager *)manager didReceiveSingleTapForView:(nullable UIView *)view atPoint:(CGPoint)point;
- (void)touchManager:(SDLTouchManager *)manager didReceiveDoubleTapForView:(nullable UIView *)view atPoint:(CGPoint)point;
- (void)touchManager:(SDLTouchManager *)manager panningDidStartInView:(nullable UIView *)view atPoint:(CGPoint)point;
- (void)touchManager:(SDLTouchManager *)manager didReceivePanningFromPoint:(CGPoint)fromPoint toPoint:(CGPoint)toPoint;
- (void)touchManager:(SDLTouchManager *)manager panningDidEndInView:(nullable UIView *)view atPoint:(CGPoint)point;
- (void)touchManager:(SDLTouchManager *)manager panningCanceledAtPoint:(CGPoint)point;
- (void)touchManager:(SDLTouchManager *)manager pinchDidStartInView:(nullable UIView *)view atCenterPoint:(CGPoint)point;
- (void)touchManager:(SDLTouchManager *)manager didReceivePinchAtCenterPoint:(CGPoint)point withScale:(CGFloat)scale;
- (void)touchManager:(SDLTouchManager *)manager didReceivePinchInView:(nullable UIView *)view atCenterPoint:(CGPoint)point withScale:(CGFloat)scale;
- (void)touchManager:(SDLTouchManager *)manager pinchDidEndInView:(nullable UIView *)view atCenterPoint:(CGPoint)point;
- (void)touchManager:(SDLTouchManager *)manager pinchCanceledAtCenterPoint:(CGPoint)point;
Swift
func touchManager(_ manager: SDLTouchManager, didReceiveSingleTapFor view: UIView?, at point: CGPoint)
func touchManager(_ manager: SDLTouchManager, didReceiveDoubleTapFor view: UIView?, at point: CGPoint)
func touchManager(_ manager: SDLTouchManager, panningDidStartIn view: UIView?, at point: CGPoint)
func touchManager(_ manager: SDLTouchManager, didReceivePanningFrom fromPoint: CGPoint, to toPoint: CGPoint)
func touchManager(_ manager: SDLTouchManager, panningDidEndIn view: UIView?, at point: CGPoint)
func touchManager(_ manager: SDLTouchManager, panningCanceledAt point: CGPoint)
func touchManager(_ manager: SDLTouchManager, pinchDidStartIn view: UIView?, atCenter point: CGPoint)
func touchManager(_ manager: SDLTouchManager, didReceivePinchAtCenter point: CGPoint, withScale scale: CGFloat)
func touchManager(_ manager: SDLTouchManager, didReceivePinchIn view: UIView?, atCenter point: CGPoint, withScale scale: CGFloat)
func touchManager(_ manager: SDLTouchManager, pinchDidEndIn view: UIView?, atCenter point: CGPoint)
func touchManager(_ manager: SDLTouchManager, pinchCanceledAtCenter point: CGPoint)
Note

Points that are provided via these callbacks are in the head unit's coordinate space. This is likely to correspond to your own streaming coordinate space. You can retrieve the head unit dimensions from SDLStreamingMediaManager.screenSize.

Implementing onTouchEvent Yourself

If you want access to the raw touch data, you can subscribe to the touch event notifications. The notification will contain the following data:

Type
Touch Type What does this mean?
BEGIN Sent for the first touch event of a touch.
MOVE Sent if the touch moved.
END Sent when the touch is lifted.
CANCEL Sent when the touch is canceled (for example, if a dialog appeared over the touchable screen while the touch was in progress).
Event
Touch Event What does this mean?
touchEventId Unique ID of the touch. Increases for multiple touches (0, 1, 2, ...).
timeStamp Timestamp of the head unit time. Can be used to compare time passed between touches.
coord X and Y coordinates in the head unit coordinate system. (0, 0) is the top left.

Example

Note

Please note that if you are integrating an sdl_ios version less than v6.3, the following example code will not work. We recommend updating to the latest release version.

Objective-C
[self.sdlManager subscribeToRPC:SDLDidReceiveTouchEventNotification withObserver:self selector:@selector(touchEventAvailable:)];

- (void)touchEventAvailable:(SDLRPCNotificationNotification *)notification {
    if (![notification.notification isKindOfClass:SDLOnTouchEvent.class]) {
        // Handle error
        return;
    }
    SDLOnTouchEvent *touchEvent = (SDLOnTouchEvent *)notification.notification;
    <#Use the touch data#>
}
Swift
sdlManager.subscribe(to: .SDLDidReceiveTouchEvent, observer: self, selector: #selector(touchEventAvailable(_:)))

@objc private func touchEventAvailable(_ notification: SDLRPCNotificationNotification) {
    guard let touchEvent = notification.notification as? SDLOnTouchEvent else {
        // Handle error
        return
    }
     <#Use the touch data#>
}
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