UIScrollView放大圖片

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView

{

    return imageView;

}

- (void)scrollViewDidZoom:(UIScrollView *)scrollView

{

    //獲取當前縮放圖片

    //    UIImageView *tempImage = [[scrollView subviews] objectAtIndex:0];

    

    //重置位置

    CGFloat offsetX = (scrollView.bounds.size.width > scrollView.contentSize.width)?

    (scrollView.bounds.size.width - scrollView.contentSize.width) * 0.5 : 0.0;

    CGFloat offsetY = (scrollView.bounds.size.height > scrollView.contentSize.height)?

    (scrollView.bounds.size.height - scrollView.contentSize.height) * 0.5 : 0.0;

    imageView.center = CGPointMake(scrollView.contentSize.width * 0.5 + offsetX,

                                        scrollView.contentSize.height * 0.5 + offsetY);

}