尝试这样的事情:
- (void)animateArrow
{
self.blueBackground.transform = CGAffineTransformIdentity;
[UIView animateWithDuration:5 animations:^{
ScaleViewAboutPointInBounds(self.blueBackground, arrowCenter, 30);
} completion:^(BOOL finished) {
}];
}
static void ScaleViewAboutPointInBounds(UIView *view, CGPoint point, CGFloat scaleAmount)
{
CGFloat xAnchor = view.layer.anchorPoint.x * CGRectGetWidth(view.bounds);
CGFloat yAnchor = view.layer.anchorPoint.y * CGRectGetHeight(view.bounds);
CGFloat xOffset = point.x - xAnchor;
CGFloat yOffset = point.y - yAnchor;
CGAffineTransform shift = CGAffineTransformMakeTranslation(-xOffset, -yOffset);
CGAffineTransform unshift = CGAffineTransformMakeTranslation(xOffset, yOffset);
CGAffineTransform scale = CGAffineTransformMakeScale(scaleAmount, scaleAmount);
view.transform = CGAffineTransformConcat(shift, CGAffineTransformConcat(scale, unshift));
}
它可能比您需要的更通用,您可以更简单地完成它,但这也应该有效。只需将 更改为point
看起来像箭头中心的东西。