iphone - How to cancel uitouches? -

in app want have users tap on left side of screen increase speed , swipe on right side work joystick. however, if user keeps holding left side, joystick doesn't work right.

i using touchesbegan, touchesmoved, etc. there way cancel info first touch , have joystick separately?

i tried [self touchescancelled: touches withevent: event]; there other way?

the cocoa touch framework multi-touch aware. therefore don't have cancel first touch work second touch. enumerate touches , use 1 want joystick in touch delegate.

nsarray  *alltouches = [ touches allobjects ]; int      numtouches  = [ alltouches count ]; (int i=0; i<numtouches; i++) {     uitouch *thetouch = [ alltouches objectatindex:i ];     if (thetouch != leftsideholdtouch) {         // maybe it's joystick touch, handle here     } }