捏缩放相机 [英] Pinch to zoom camera

问题描述

我正在尝试缩放相机，但我遇到了两个问题。首先，它允许用户进行太多的放大，然后进行大量的放大，其次，当我拍摄照片时，它不会采用放大视图。这是我的捏合函数代码...

I'm trying to make a pinch to zoom camera but I'm encountering two problems. First is that it allows the user to zoom way too much in and way to much out, secondly when I take a picture it doesn't take it of the zoomed in view. Here is my code for the pinch function...

func pinch(pinch: UIPinchGestureRecognizer) {
    if let view = cameraView {
        view.transform = CGAffineTransformScale(view.transform,
            pinch.scale, pinch.scale)
            pinch.scale = 1
    }

}

告诉我你是否需要再看代码。谢谢！

Tell me if you need to see any more code. Thanks!

推荐答案

我遇到过相机实现的相同问题。要解决这个问题，你需要了解两件事。

I have experienced the same issues with the camera implementation. To solve this you need to know about two things.

• 最大和最小缩放必须在一个值内，否则会导致相机放大太多了。


• 与实际图像没有保存放大图像一样，这是许多在线解决方案无法涵盖的常见错误。这实际上是因为你只是改变视图的缩放而不是实际的 AVCaptureDevice 的缩放。

• The max and min zoom has to be within a value or else it results in the camera zooming in way too much.
• As with the actual image not saving the zoomed in image, it is a common bug a lot of solutions online do not cover. This is actually because you are only changing the view's zoom and not the actual AVCaptureDevice's zoom.

要改变你需要的两件事：

To change the two things you need something like this:

func pinch(pinch: UIPinchGestureRecognizer) {
   var device: AVCaptureDevice = self.videoDevice
   var vZoomFactor = ((gestureRecognizer as! UIPinchGestureRecognizer).scale)
   var error:NSError!
        do{
            try device.lockForConfiguration()
            defer {device.unlockForConfiguration()}
            if (vZoomFactor <= device.activeFormat.videoMaxZoomFactor){
                device.videoZoomFactor = vZoomFactor
            }else{
            NSLog("Unable to set videoZoom: (max %f, asked %f)", device.activeFormat.videoMaxZoomFactor, vZoomFactor);
            }
        }catch error as NSError{
             NSLog("Unable to set videoZoom: %@", error.localizedDescription);
        }catch _{

        }
}

正如您所看到的，我使用视频设备的类变量（ videoDevice ）来跟踪我用于可视组件的捕获设备。我将缩放限制在特定范围并更改设备上的缩放属性而不是视图本身！

As you can see I use a class variable for the video device (videoDevice) to keep track of the capture device I am using for visual component. I restrict the zoom to a particular range and change the zoom property on the device and not the view itself!

这篇关于捏缩放相机的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！