拖动+旋转使用UIPanGestureRecognizer触摸下车轨道

我正在使用UIPanGestureRecognizer进行拖动和旋转计算。 旋转angular度是正确的，拖动位置几乎是正确的。 问题是，当你走在箱子的中心需要根据angular度进行调整，我不知道如何。

我已经包含了旋转过程中180度旋转的图像，但手指在哪里。 我只是不知道如何调整，使块适当地留在你的手指。 inheritance人一个video只是为了澄清，因为这是奇怪的行为。 http://tinypic.com/r/mhx6a1/5

编辑：这是一个真实的世界video应该发生什么。 问题是，在iPadvideo中，您的手指正在移动，在真实世界的任何地方，您的手指会粘在物品移动的特定位置。 math需要的是调整你的触摸位置的angular度与实际中心的差异。 我只是无法弄清楚math。 http://tinypic.com/r/4vptnk/5

非常感谢！

- (void)handlePan:(UIPanGestureRecognizer *)gesture { if (gesture.state == UIGestureRecognizerStateBegan) { // set original center so we know where to put it back if we have to. originalCenter = dragView.center; } else if (gesture.state == UIGestureRecognizerStateChanged) { [dragView setCenter:CGPointMake( originalCenter.x + [gesture translationInView:self.view].x , originalCenter.y + [gesture translationInView:self.view].y )]; CGPoint p1 = button.center; CGPoint p2 = dragView.center; float adjacent = p2.x-p1.x; float opposite = p2.y-p1.y; float angle = atan2f(adjacent, opposite); [dragView setTransform:CGAffineTransformMakeRotation(angle*-1)]; } } 

Answer 1

我终于解决了这个问题，并完美地工作。 坚持我是吗？

这里是解决scheme的代码和一些注释来解释变化。

 - (void)handlePan:(UIPanGestureRecognizer *)gesture { if (gesture.state == UIGestureRecognizerStateBegan) { // Get the location of the touch in the view we're dragging. CGPoint location = [gesture locationInView:dragView]; // Now to fix the rotation we set a new anchor point to where our finger touched. Remember AnchorPoints are 0.0 - 1.0 so we need to convert from points to that by dividing [dragView.layer setAnchorPoint:CGPointMake(location.x/dragView.frame.size.width, location.y/dragView.frame.size.height)]; } else if (gesture.state == UIGestureRecognizerStateChanged) { // Calculate Our New Angle CGPoint p1 = button.center; CGPoint p2 = dragView.center; float adjacent = p2.x-p1.x; float opposite = p2.y-p1.y; float angle = atan2f(adjacent, opposite); // Get the location of our touch, this time in the context of the superview. CGPoint location = [gesture locationInView:self.view]; // Set the center to that exact point, We don't need complicated original point translations anymore because we have changed the anchor point. [dragView setCenter:CGPointMake(location.x, location.y)]; // Rotate our view by the calculated angle around our new anchor point. [dragView setTransform:CGAffineTransformMakeRotation(angle*-1)]; } } 

希望我的月份+奋斗和解决scheme可以帮助未来的其他人。 快乐编码:)

Answer 2

基于触摸事件https://github.com/kirbyt/KTOneFingerRotationGestureRecognizer

帮助我解决类似的问题