是否有办法确定UIScrollView是否可以在<条码>上<>zoom ToRect:上,可在<条码>上
或许这种事情会奏效? (从https://stackoverflow.com/a/2125472/845115)中略失)
- (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);
}
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