缩放图像以适应iPhone旋转时的屏幕 [英] Scale image to fit screen on iPhone rotation

问题描述

我有一个包含UIImageView的UIScrollView，当iPhone旋转时我遇到一些麻烦来获得正确的行为。

I have a UIScrollView containing an UIImageView and I have some trouble to get the correct behavior when the iPhone rotates.

目标：我在尝试从纵向到横向时获取以下内容：

Goal: I am trying to obtain the following when going from portrait to landscape:

_________
|AAAAAAA|
|BBBBBBB|         _________________
|CCCCCCC|         |     AAAAAA     |
|DDDDDDD|    -->  |     CCCCCC     |
|EEEEEEE|         |     EEEEEE     |
|FFFFFFF|         |_____GGGGGG_____|
|GGGGGGG|
---------

这里是纵向视图中的整个图像在iPhone旋转时缩放以适合横向视图。它也是中心的。我也试图保持纵横比。用户交互也开启，用户应该可以使用整个屏幕来平移/缩放图像。

Here the entire image in the portrait view is scaled to fit in the landscape view when the iPhone rotates. It is also centered. I am also trying to preserve the aspect ratio. User interaction is also on, and the user should be able to use the entire screen to pan/zoom the image.

目前我有以下 scrollView上的autoresizingMask ：

 scrollView.autoresizingMask =(UIViewAutoresizingFlexibleWidth |
                               UIViewAutoresizingFlexibleHeight);       

但是这给出了以下

_________
|AAAAAAA|
|BBBBBBB|         _________________
|CCCCCCC|         |AAAAAA          |
|DDDDDDD|    -->  [BBBBBB          |
|EEEEEEE|         [CCCCCC          |
|FFFFFFF|         [DDDDDD__________|
|GGGGGGG|
---------

此设置可保留上限和偏移量左角。

This setting preserves scale and offset from upper left corner.

问题：
是否可以使用合适的 autoresizingMask ？如果没有，可能应该设置

Question: Is it possible to obtain this behaviour using suitable autoresizingMask? If not, one should probably set

 scrollView.autoresizingMask = UIViewAutoresizingNone;

并手动设置 zoomScale 和<$ c旋转时UIScrollView的$ c> contentOffset 。但是，应该在哪里完成？那个变化的动画怎么样？

and manually set zoomScale and contentOffset for the UIScrollView on rotation. But, where should that be done? What about animating that change?

解决方案：
通过稍微修改下面的答案我使用$ b $得到了上述行为b以下代码：

Solution: By very slightly modifying the answer below I got the above behaviour using the below code:

imageView.autoresizingMask = (UIViewAutoresizingFlexibleWidth |
                                     UIViewAutoresizingFlexibleHeight);

scrollView.autoresizingMask =(UIViewAutoresizingFlexibleWidth 
                                     | UIViewAutoresizingFlexibleHeight);

imageView.contentMode = UIViewContentModeScaleAspectFit;
scrollView.contentMode = UIViewContentModeCenter;

推荐答案

试试这个：

scrollView.autoresizingMask = (UIViewAutoresizingFlexibleWidth |
                           UIViewAutoresizingFlexibleHeight);    
imageView.autoresizingMask = (UIViewAutoresizingFlexibleWidth |
                           UIViewAutoresizingFlexibleHeight);

imageView.contentMode = UIViewContentModeAspectFit; // You could also try UIViewContentModeCenter

我不确定imageView是否会自动调整大小UIScrollView，因此如果自动调整不起作用，您可以尝试在旋转时自己设置框架以等于滚动视图的大小。

I'm not sure if the imageView will get automatically resized within a UIScrollView, so if the autoresizing doesn't work, you could try setting the frame yourself on rotate to equal the size of the scrollview.

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