IOS 自定义手势方向
//自定义一个类继承于 UIPanGestureRecognizer
-(void)touchesBegan:(NSSet*)touches withEvent:(UIEvent *)event{
UITouch *touch=[touches anyObject];
startPoint=[touch locationInView:self.view];
_curPoint = startPoint;
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch=[touches anyObject];
endPoint=[touch locationInView:self.view];
self.curPoint =endPoint;
CGFloat moveAmtX = endPoint.x - startPoint.x;
CGFloat moveAmtY = endPoint.y - startPoint.y;
self.curMoveAmtX = moveAmtX;
self.curMoveAmtY = moveAmtY;
CGFloat moveAmtYAbs = fabs(moveAmtY);
//斜边
CGFloat moveHypotenuse = sqrt(moveAmtX*moveAmtX + moveAmtY*moveAmtY);
// 1.57 0.785
CGFloat rate = moveAmtYAbs*1.0/moveHypotenuse;
//通过调这个rate值来定义你想触发的手势方向的作用范围.
if(asin(rate) >=1.0){
[selfsetState:UIGestureRecognizerStateChanged];
}else{
return ;
}
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
startPoint=CGPointZero;
_curPoint = startPoint;
[selfsetState:UIGestureRecognizerStateEnded];
return ;
}