帶有刻度的UIScrollView setContentOffset

Question

我如何滾動到x，y而不是1.0？

我以為我要做的就是將其乘以比例。 如果在zoomScale為1時滾動到100,100，是否在zoomScale為.50時將其轉換為50,50？

Answer 1

不確定setContentOffset，但是如果您這樣做，則無需轉換：

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
    return self.rootView;
}

- (void)zoomToPointInRootView:(CGPoint)center atScale:(float)scale {
    CGRect zoomRect;

    zoomRect.size.height = [scrollView frame].size.height / scale;
    zoomRect.size.width  = [scrollView frame].size.width  / scale;

    zoomRect.origin.x    = center.x - (zoomRect.size.width  / 2.0);
    zoomRect.origin.y    = center.y - (zoomRect.size.height / 2.0);

    [scrollView zoomToRect:zoomRect animated:NO];
}