ios - 已放大到全屏的动态居中 UIImagepicker 取景器

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。

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。

感谢任何帮助。

// get the screen size
CGSize screenSize = [[UIScreen mainScreen] 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;

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Best Answer-推荐答案

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:

//按4:3比例获取相机高度

int cameraViewHeight = SCREEN_WIDTH * 1.333;

int adjustedYPosition = (SCREEN_HEIGHT - cameraViewHeight) / 2;

CGAffineTransform translate = CGAffineTransformMakeTranslation(0, adjustedYPosition);
self.imagePicker.cameraViewTransform = translate;

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： https://stackoverflow.com/questions/26727552/