可以UIScrollView zoomToRect吗？

Question

有没有办法确定UIScrollView在zoomToRect:和maximumZoomScale内是否可以minimumZoomScale？如果所需的zoomScale太小，请返回NO？

Answer 1

也许这种事情可能有用吗？ （想法从https://stackoverflow.com/a/2125472/845115略有被盗）

- (BOOL)scrollView:(UIScrollView*)scrollView canZoomToRect:(CGRect)zoomToRect {
    CGPoint contentOffsetBefore = scrollView.contentOffset;
    CGFloat zoomBefore = scrollView.zoomScale;
    [scrollView zoomToRect:zoomToRect animated:NO];
    CGFloat zoomAfter = scrollView.zoomScale;

    [scrollView setZoomScale:zoomBefore animated:NO];
    [scrollView setContentOffset:contentOffsetBefore animated:NO];

    return (zoomBefore == zoomAfter);
}