ios - 已放大到全屏的动态居中 UIImagepicker 取景器
<p><p>我正在为 iPhone 5 制作全屏摄像头，并使用以下代码缩放 4:3 摄像头以填充整个屏幕，即 2:3 比例。左侧和右侧从屏幕上溢出。</p>
<p>我必须将 cameraView 向下移动 71 个点才能使其与屏幕居中。否则，底部会有一个黑条。我不太清楚为什么。因为我不知道为什么会发生这种情况，所以我无法弄清楚如何动态编码调整以适应 iPhone 6 和 6 Plus。</p>
<p>感谢任何帮助。</p>
<pre><code>// get the screen size
CGSize screenSize = [ bounds].size;
// establish the height to width ratio of the camera
float heightRatio = 4.0f / 3.0f;
// calculate the height of the camera based on the screen width
float cameraHeight = screenSize.width * heightRatio;
// calculate the ratio that the camera height needs to be scaled by
float ratio = screenSize.height / cameraHeight;
//This slots the preview exactly in the middle of the screen by moving it down 71 points (for iphone 5)
CGAffineTransform translate = CGAffineTransformMakeTranslation(0.0, 71.0);
self.camera.cameraViewTransform = translate;
CGAffineTransform scale = CGAffineTransformScale(translate, ratio, ratio);
self.camera.cameraViewTransform = scale;
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>这终于在我脑海中响起。因为我们知道相机的长度总是和屏幕宽度一样:</p>
<p>//按4:3比例获取相机高度</p>
<pre><code>int cameraViewHeight = SCREEN_WIDTH * 1.333;
int adjustedYPosition = (SCREEN_HEIGHT - cameraViewHeight) / 2;
CGAffineTransform translate = CGAffineTransformMakeTranslation(0, adjustedYPosition);
self.imagePicker.cameraViewTransform = translate;
</code></pre></p>
<p style="font-size: 20px;">关于ios - 已放大到全屏的动态居中 UIImagepicker 取景器，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/26727552/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/26727552/
</a>
</p>
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