MultitouchGestureRecognizer
MultitouchGestureRecognizer is a UIGestureRecognizer subclass providing a richer API for working with multiple touches.
Demo project available in the Multitouch directory.
Installation:
pod 'MultitouchGestureRecognizer', '~> 2.0'Usage:
let gestureRecognizer = MultitouchGestureRecognizer()
gestureRecognizer.delegate = self
view.addGestureRecognizer(gestureRecognizer)Features:
✓ Maximum touch count setting and stack/queue option:
// Only register the five touches received first:
gestureRecognizer.mode = .stack
gestureRecognizer.count = 5
// Only register the one touch received last:
gestureRecognizer.mode = .queue
gestureRecognizer.count = 1✓ Sustain setting for retaining touches at the end of a gesture (ideal for, say, implementing a piano keyboard with a sustain function)
gestureRecognizer.sustain = true✓ Delegate protocol methods for individual touches:
func multitouchGestureRecognizer(_ gestureRecognizer: MultitouchGestureRecognizer, touchDidBegin touch: UITouch) {
print("Touch started")
}
func multitouchGestureRecognizer(_ gestureRecognizer: MultitouchGestureRecognizer, touchDidMove touch: UITouch) {
print("Touch updated")
}
func multitouchGestureRecognizer(_ gestureRecognizer: MultitouchGestureRecognizer, touchDidCancel touch: UITouch) {
print("Touch cancelled")
}
func multitouchGestureRecognizer(_ gestureRecognizer: MultitouchGestureRecognizer, touchDidEnd touch: UITouch) {
print("Touch finished")
}✓ Keeps track of the gesture's state and touches:
if (gestureRecognizer.multitouchState == .live) {
print("Gesture recognizer is currently receiving touches:", gestureRecognizer.touches)
}✓ Centroid helper
print(multitouchGestureRecognizer.centroid) // Prints the average of all touchesTodo:
- Make GIF preview
- Publish to Carthage
- Publish to Cocoa controls