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我正在使用平移手势，在它移动后，我试图让它以触摸发生的角度移动。我想在平移发生时以及当用户抬起手指时得到触摸点。之后计算点的角度并使用它来移动。我不确定我在这里做错了什么。

 -(void) dragging:(UIPanGestureRecognizer *)p{
    UIView *v = p.view;
    CGPoint velocity;
    if(p.state == UIGestureRecognizerStateBegan){
        self.origC = v.center;
        self.pointIn = [p locationInView:[UIApplication sharedApplication].keyWindow];
        //NSLog(@"%f",self.pointIn.x);
        //pointInWindow = CGPointMake(pointIn.x, pointIn.y);
    }
    //NSLog(@"%f,%f orig %f, %f",pointInWindow.x, pointInWindow.y,self.origC.x,self.origC.y);
    //velocity = [p velocityInView:v.superview];
    //NSLog(@"x=%f",velocity.x);
    //NSLog(@"y=%f",velocity.y);
    [UIView animateWithDuration:1 delay:0 options:UIViewAnimationCurveEaseInOut animations:^{
        CGPoint delta = [p translationInView:v.superview];
        CGPoint c = self.origC;
        c.x += delta.x;
        c.y += delta.y;
        v.center = c;
    }completion:nil];
    if(p.state == UIGestureRecognizerStateEnded){
        CGPoint lastPoint = [p locationInView:[UIApplication sharedApplication].keyWindow];
        NSLog(@"orig %f , last %f",self.pointIn.x,lastPoint.x);
        self.lateC = v.center;
        CGFloat deltaX = self.pointIn.x - lastPoint.x;
        CGFloat deltaY = self.pointIn.y - lastPoint.y;
        double angle = atan(deltaX/deltaY) * 180/M_PI;
        if(angle < 0)
            angle += 360;
        //NSLog(@"%f",angle);
        self.addy = angle;
        self.addx = angle;
    }
}

这是在我的 ViewController 中：

-(void) animateBalls:(NSTimer*) time{
    for(Ball *balls in self.view.subviews){
        [UIView beginAnimations:nil context:nil];
        //[UIView setAnimationRepeatAutoreverses:NO];
        CGFloat x;
        CGFloat y;
        for(Ball *subBalls in self.view.subviews){
            if(balls != subBalls)
                if((CGRectIntersectsRect([balls frame], [subBalls frame]))){
                    [subBalls changeDirectionX];
                    [subBalls changeDirectionY];
                }

        }
        CGPoint point = balls.center;
        if(point.x + 25 > self.view.bounds.size.width)
            [balls changeDirectionX];
        if(point.x - 25 < 0)
            [balls changeDirectionX];
        if(point.y + 25 > self.view.bounds.size.height)
            [balls changeDirectionY];
        if(point.y - 25 < 0)
            [balls changeDirectionY];
        if(balls.directionX == 1){
            x = point.x + (2 * cos(balls.addx));
        }
        else{
            x = point.x - (2 * cos(balls.addx));
            //balls.addx;
        }
        if(balls.directionY == 1){
            y = point.y + (2 * sin(balls.addx));
        }
        else
            y = point.y - (2 * sin(balls.addx));
        //balls.addy;
        //CGFloat x = (CGFloat) random()/(CGFloat) RAND_MAX * self.view.bounds.size.width;
        //CGFloat y = (CGFloat) random()/(CGFloat) RAND_MAX * self.view.bounds.size.height;

        CGPoint squarePostion = CGPointMake(x, y);
        balls.center = squarePostion;

        [UIView commitAnimations];
        //[self.view setNeedsDisplay];
    }
}
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