ios - 旋转 180 后 UIImageView 反向移动的旋转移动缩放*

Question

这是我用于移动、缩放和旋转 UI 的代码ImageView都可以正常工作，但问题是当我们旋转ImageView它时它会旋转，但之后它会反向移动，就像我向右拖动但ImageView向左移动后我们无法获得当前中心点旋转，这样当我们拖动中心点时，旋转的ImageView不是原始的

这是继承的自定义类UIImageView

#pragma mark Manipulation
-(void)scale:(id)sender {
    if([(UIPinchGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan) 
{
        _lastScale = 1.0;
    }

    CGFloat scale = 1.0 - (_lastScale - [(UIPinchGestureRecognizer*)sender scale]);

    CGAffineTransform currentTransform = self.transform;
    CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale, scale);

    [self setTransform:newTransform];


    _lastScale = [(UIPinchGestureRecognizer*)sender scale];
    [self showOverlayWithFrame:self.frame];
}


-(void)rotate:(id)sender {

    if([(UIRotationGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) {

        _lastRotation = 0.0;

        return;
    }


    CGFloat rotation = 0.0 - (_lastRotation - [(UIRotationGestureRecognizer*)sender rotation]);

    CGAffineTransform currentTransform = self.transform;
    CGAffineTransform newTransform = CGAffineTransformRotate(currentTransform,rotation);

    [self setTransform:newTransform];
    _lastRotation = [(UIRotationGestureRecognizer*)sender rotation];

    [self showOverlayWithFrame:self.frame];





}


-(void)move:(id)sender {

    CGPoint translatedPoint = [(UIPanGestureRecognizer*)sender translationInView:self];

     if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan) {
         _firstX = [self center].x;
         _firstY = [self center].y;
    }

    translatedPoint = CGPointMake(_firstX+translatedPoint.x, _firstY+translatedPoint.y);

    [self setCenter:translatedPoint];


    [self showOverlayWithFrame:self.frame];

}

Answer 1

通过更改 -(void)move:(id)sender 中的这一行，我的任务就完成了

年长者

CGPoint translatedPoint = [(UIPanGestureRecognizer*)sender translationInView:self];

正确的

CGPoint translatedPoint = [(UIPanGestureRecognizer*)sender translationInView:[self superview]];

Answer 2

2个选项：

1. 使用CGAffineTransformTranslate与您一直使用的相同的方式Scale和Rotate。
2. 更好的是，重置仿射变换，移动图像视图，然后重新设置变换。

试试这个代码选项2：

CGAffineTransform t = self.transform;
self.transform = CGAffineTransformIdentity;
[self setCenter:translatedPoint];
self.transform = t;