ios - 尝试拖放对象时旋转 UIView iOS 错误

Question

我有一个用于拖放对象的 UIView 子类，它工作得很好，但在我应用此转换之后

    CGAffineTransform transform = CGAffineTransformMakeRotation(M_PI_2);
    self.transform = transform;

当去拖放时，对象开始无限螺旋 :-/

触摸开始

if (!moveObject){

    CGAffineTransform transform = CGAffineTransformMakeRotation(M_PI_2);
    self.transform = transform;

}else{

    // When a touch starts, get the current location in the view
    currentPoint = [[touches anyObject] locationInView:self];
}

触摸移动代码在这里

if (moveObject){

    //Current point is locationInView get in touchBegin
    // Get active location upon move
    CGPoint activePoint = [[touches anyObject] locationInView:self];

    // Determine new point based on where the touch is now located
    CGPoint newPoint = CGPointMake(self.center.x + (activePoint.x - currentPoint.x),
                                   self.center.y + (activePoint.y - currentPoint.y));
    // Set new center location
    self.center = newPoint;
}

我该如何解决这个问题？

附言moveObject 在别处声明，并正确设置为 YES/NO。

---

我不想同时移动和旋转对象，每次只做一件事。当我旋转 UIView 时，我想保持一个新的方向，我必须能够以新的方向移动对象。

已添加这是我的 xcode 项目示例。 https://www.dropbox.com/s/lza1n9kjnxa4zun/xcode.zip

Answer 1

我对此进行了测试，它的效果非常好:

- (void)viewDragged:(UIPanGestureRecognizer *)gesture
{

    CGPoint translation = [gesture translationInView:self.view];

    gesture.view.center = CGPointMake(gesture.view.center.x + translation.x, gesture.view.center.y + translation.y);


    [gesture setTranslation:CGPointZero inView:gesture.view];

}