ios - Call function when SwipeGestureRecognizer swipe speed passes threshold -


i'm programming app, contains uiview uiswipegesturerecognizer

i want recognizer recognize how fast user dragging in recognizer's direction. when speed high enough (past specific threshold) custom action should occur. it's same in this post, need written in swift.

how translate swift or there better way it?

current code, xcode errors marked comments.

touches began:

override func touchesbegan(touches: set<nsobject>, withevent event: uievent) {           //avoid multi-touch gesture         if(touches.count > 1){             return;         }          if let touch:uitouch = touches.first as? uitouch{             let locator:cgpoint = touch.locationinview(self.view!)             start = locator             starttime = touch.timestamp         }

touches ended:

    override func touchesended(touches: set<nsobject>, withevent event: uievent) {      if let touch:uitouch = touches.first as? uitouch{         let locator:cgpoint = touch.locationinview(self.view!)          var dx:cgfloat = (locator.x - start!.x);         var dy:cgfloat = (locator.y - start!.y);         var magnitude:cgfloat = sqrt(dx*dx+dy*dy)          if (magnitude >= kmindistance) {             // determine time difference start of gesture             var dt:cgfloat = cgfloat(touch.timestamp - starttime!)             if (dt > kminduration) {                 // determine gesture speed in points/sec                 var speed:cgfloat = magnitude / dt;                  if (speed >= kminspeed && speed <= kmaxspeed) {                     // swipe detected                     swipedview()     }}}}} 

var start:cgpoint? var starttime:nstimeinterval?  var kmindistance:cgfloat   = 25.0 var kminduration:cgfloat   = 0.1 var kminspeed:cgfloat      = 100.0 var kmaxspeed:cgfloat      = 500.0  override func touchesbegan(touches: set<nsobject>, withevent event: uievent) {     //avoid multi-touch gesture     if(touches.count > 1){         return;     }      if let touch:uitouch = touches.first as? uitouch{         let location:cgpoint = touch.locationinview(self.view!)         start = location         starttime = touch.timestamp     } }  override func touchesended(touches: set<nsobject>, withevent event: uievent) {     if let touch:uitouch = touches.first as? uitouch{         let location:cgpoint = touch.locationinview(self.view!)          var dx:cgfloat = location.x - start!.x;         var dy:cgfloat = location.y - start!.y;         var magnitude:cgfloat = sqrt(dx*dx+dy*dy)          if (magnitude >= kmindistance) {             // determine time difference start of gesture             var dt:cgfloat = cgfloat(touch.timestamp - starttime!)             if (dt > kminduration) {                 // determine gesture speed in points/sec                 var speed:cgfloat = magnitude / dt;                 if (speed >= kminspeed && speed <= kmaxspeed) {                     // swipe detected                 }             }         }     } }

honesty need has not been tested needed code converted on go.

edit: tested , seems work swift 1.2
please read comments underneath question , read how ask next question. lucky time needed code :)


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