2

我在 UIViewController 中有一个 UIScrollView。它启用了滚动和缩放。它包含一个 UIImageView ，当用户旋转设备时，这个想法是图像保持居中。问题是，当设备旋转时，它实际上出现在左边而不是中心，它应该停留在哪里。这是我正在使用的代码。当 UIScrollView 旋转时调用 Set frame：

-(void)setFrame:(CGRect)frame {

    float previousWidth = self.frame.size.width;
    float newWidth = frame.size.width;

    [super setFrame:frame];
    self.imageView.center = CGPointMake(self.bounds.size.width / 2, self.bounds.size.height / 2);

    [self setupScales];

    self.zoomScale = self.zoomScale * (newWidth / previousWidth);
}
4

3 回答 3

1

我在 uiscrollview 的子类中使用以下 layoutsubviews 方法：

- (void)layoutSubviews {
    [super layoutSubviews];

    if ([[self subviews] count] == 0) {
        return;
    }

    // center the image as it becomes smaller than the size of the screen
    CGSize boundsSize = self.bounds.size;
    CGRect frameToCenter = ((UIView*)[[self subviews] objectAtIndex:0]).frame;

    // center horizontally
    if (frameToCenter.size.width < boundsSize.width)
        frameToCenter.origin.x = (boundsSize.width - frameToCenter.size.width) / 2;
    else
        frameToCenter.origin.x = 0;

    // center vertically
    if (frameToCenter.size.height < boundsSize.height)
        frameToCenter.origin.y = ((boundsSize.height - frameToCenter.size.height) / 2);
    else
        frameToCenter.origin.y = 0;

    ((UIView*)[[self subviews] objectAtIndex:0]).frame = frameToCenter;
}
于 2012-05-08T18:52:35.297 回答
0

您可能还需要设置contentOffset滚动视图的属性

于 2012-05-08T18:30:15.217 回答
0

如果滚动视图随着方向变化而调整大小，试试这个

self.imageView.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleTopMargin;
于 2012-05-08T18:45:52.763 回答