ios – 使用Swift将相机焦点设置在Tap point上

发布时间：2020-12-15 01:47:56 所属栏目：百科来源：网络整理

导读：在swift中使用相机的API似乎有些不同,我很难将相机对准一个点.当用户点击屏幕时,我希望相机对焦于该点这是我的代码： func focusCamera(point:CGPoint) { var screenRect:CGRect = bounds var focusX = Float(point.x/screenRect.width) var focusY = Float

在swift中使用相机的API似乎有些不同,我很难将相机对准一个点.当用户点击屏幕时,我希望相机对焦于该点

这是我的代码：

func focusCamera(point:CGPoint)
    {
        var screenRect:CGRect = bounds
        var focusX = Float(point.x/screenRect.width)
        var focusY = Float(point.y/screenRect.height)

        _currentDevice.lockForConfiguration(nil)
        _currentDevice.setFocusModeLockedWithLensPosition(focusX)
        {
            time in
            self._currentDevice.unlockForConfiguration()
        }

        _currentDevice.setFocusModeLockedWithLensPosition(focusY)
        {
                time in
                self._currentDevice.unlockForConfiguration()
        }
    }

但它似乎没有用.

任何建议都非常欢迎！

解决方法

来自@ryantxr for Swift 3的更新答案：

override func touchesBegan(_ touches: Set<UITouch>,with event: UIEvent?) {
        let screenSize = videoView.bounds.size
        if let touchPoint = touches.first {
            let x = touchPoint.location(in: videoView).y / screenSize.height
            let y = 1.0 - touchPoint.location(in: videoView).x / screenSize.width
            let focusPoint = CGPoint(x: x,y: y)

            if let device = captureDevice {
                do {
                    try device.lockForConfiguration()

                    device.focusPointOfInterest = focusPoint
                    //device.focusMode = .continuousAutoFocus
                    device.focusMode = .autoFocus
                    //device.focusMode = .locked
                    device.exposurePointOfInterest = focusPoint
                    device.exposureMode = AVCaptureExposureMode.continuousAutoExposure
                    device.unlockForConfiguration()
                }
                catch {
                    // just ignore
                }
            }
        }
    }

（编辑：李大同）

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