Question

我有一个包含视图的滚动视图。在视图中有3个imageViews（屏幕大小）。用户可以随时站在第二个imageview上。我想让用户缩放此图像视图。

如何正确实施缩放我的情况？

Answer 1

请参阅本教程，希望有所帮助：）

how-to-use-uiscrollview-to-scroll-and-zoom-content

Answer 2

您可以将滚动视图设置为最大和最小缩放比例，如下所示..

在第二张图片的第二页上，只需将您的滚动视图设置为maximumzoomscale属性...

    CGFloat minScale = MIN(yourScrollView.frame.size.width, yourScrollView.frame.size.height);

   yourScrollView.minimumZoomScale = minScale; 

    yourScrollView.maximumZoomScale = 1.0f; /// set here your zoom scale...
    yourScrollView.zoomScale = minScale;

<强>更新

// Get a zoom scale that's zoomed in slightly, capped at the maximum zoom scale specified by the scroll view
CGFloat newZoomScale = yourScrollView.zoomScale * 1.5f;
newZoomScale = MIN(newZoomScale, yourScrollView.maximumZoomScale);

// Figure out the rect we want to zoom to, then zoom to it
CGSize scrollViewSize = yourScrollView.bounds.size;

CGFloat w = scrollViewSize.width / newZoomScale;
CGFloat h = scrollViewSize.height / newZoomScale;
CGFloat x = yourScrollView.center.x - (w / 2.0f);
CGFloat y = yourScrollView.center.y - (h / 2.0f);

CGRect rectToZoomTo = CGRectMake(x, y, w, h);

[yourScrollView zoomToRect:rectToZoomTo animated:YES];

我希望这可以帮助你...

使用3个图像视图正确放大滚动视图

2 个答案: