Question

我已将UIImageView添加到UIScrollView中。您可以点击滚动视图，并将另一个UIImageView添加到＆＃34; main＆＃34;的UIImageView。我使用此代码从触摸中获取坐标并将其转换为本地坐标：

- (void)tapped:(UITapGestureRecognizer *)gestureRecognizer {
    CGPoint position = [gestureRecognizer locationInView:_imagescrollview];
    CGPoint positioninimageview = [_imagescrollview convertPoint:position toView:_editimageview];
    newimageview.frame = CGRectMake(positioninimageview.x, positioninimageview.y,160.f,160.f);
    [self.editimageview addSubview:newimageview];
}

这有效！

我使用此代码来旋转和缩放UIImageView：

- (void)applyTransform {
    CGAffineTransform rotatetransform = CGAffineTransformMakeRotation(_rotation);
    CGAffineTransform scaletransform = CGAffineTransformMakeScale(_scale, _scale);
    newimageview.transform = CGAffineTransformConcat(rotatetransform,scaletransform);
}

这也有效！

我使用此代码移动UIImageView：

- (void)setEyePositionAndReposition:(CGPoint)eyeposition {
    CGAffineTransform t = newuiimageview.transform;
    newuiimageview.transform = CGAffineTransformIdentity;
    newuiimageview.frame = CGRectMake(eyeposition.x, eyeposition.y, _eyeimageview.frame.size.width, _eyeimageview.frame.size.height);
    newuiimageview.transform = t;
}

这只有在眼睛不旋转和/或缩放时才有效。如果旋转为90,180,270,360等度，并且刻度为1.f则没有问题。一旦比例增加并且我移动视图，触摸x，y和newimageview x，y就会关闭。缩放越大，差异越大。我尝试使用触摸点和变换（旋转和缩放）来计算CGPoint：

CGPoint newpoint = CGPointApplyAffineTransform(newimageposition, CGAffineTransformConcat(rotatetransform,scaletransform));

但这导致负x ...

不知怎的，我必须撤消旋转和缩放

Answer 1

通过设置center来定位视图，frame在变换下是不变的。请勿使用其HasLaunchedOnce。

旋转和缩放后移动UIImageView时奇怪的行为x，y坐标

1 个答案: