Question

我有一个用于拖放对象的UIView子类，它的工作完全正常但在我应用此转换之后

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

当进行拖放时，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];
}

触摸移动的代码在这里

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;
}

我如何解决这个问题？

P.S。 moveObject在别处声明，并且正确设置为YES / NO。

我不想同时移动和旋转物体，每次只能做一件事。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。

ADDED 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，它就像魅力一样：

- (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];

}

Answer 2

已编辑现在，当我们了解更多信息时......

如果您希望将某种切换器与moveObject进行两种不同的操作，则需要将所有代码移动到其他块中：

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];
    //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;
}

甚至更好，如果你想在每次触摸时将视图旋转90度，那么将转换代码更改为：

if (!moveObject){
    self.transform = CGAffineTransformRotate(self.transform, M_PI_2);
}
else {
    ….
}

您可以设置较小的值而不是M_PI_2，以便在用手指平移时实现慢速旋转=）

尝试拖放对象时旋转UIView iOS错误

2 个答案: