Ios 如何使用前置摄像头进行变焦
在我的定制相机中,我实现了一个捏手势识别器。然后我为视频添加了一个可以缩放的功能。当我在后摄像头上时,摄像头会缩放,但当我切换到前摄像头时,不允许缩放。这是我的职责Ios 如何使用前置摄像头进行变焦,ios,swift,xcode,camera,uigesturerecognizer,Ios,Swift,Xcode,Camera,Uigesturerecognizer,在我的定制相机中,我实现了一个捏手势识别器。然后我为视频添加了一个可以缩放的功能。当我在后摄像头上时,摄像头会缩放,但当我切换到前摄像头时,不允许缩放。这是我的职责 var zoomFactor: CGFloat = 1.0 @objc func pinch(_ pinch: UIPinchGestureRecognizer) { print("123") guard let device = videoCaptureDevice else { return } func
var zoomFactor: CGFloat = 1.0
@objc func pinch(_ pinch: UIPinchGestureRecognizer) {
print("123")
guard let device = videoCaptureDevice else { return }
func minMaxZoom(_ factor: CGFloat) -> CGFloat { return min(max(factor, 1.0), device.activeFormat.videoMaxZoomFactor) }
func update(scale factor: CGFloat) {
do {
try device.lockForConfiguration()
defer { device.unlockForConfiguration() }
device.videoZoomFactor = factor
} catch {
debugPrint(error)
}
}
let newScaleFactor = minMaxZoom(pinch.scale * zoomFactor)
switch pinch.state {
case .began: fallthrough
case .changed: update(scale: newScaleFactor)
case .ended:
zoomFactor = minMaxZoom(newScaleFactor)
update(scale: zoomFactor)
default: break
}
}