目前,我有一个 vie Controller ,它以模态方式呈现一个包含相机的 View Controller 。但是,每当我转换时,预览层都有一个动画,因此它从左上角循环增长以填充屏幕的其余部分。我试过禁用 CALayer 隐式动画但没有成功。这是 View 出现时的代码。
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
previewLayer?.frame = self.view.frame
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
capturedImageView.center = self.view.center
captureSession = AVCaptureSession()
if usingFrontCamera == true {
captureSession?.sessionPreset = AVCaptureSession.Preset.hd1920x1080
}
else {
captureSession?.sessionPreset = AVCaptureSession.Preset.hd1280x720
}
captureDevice = AVCaptureDevice.default(for: AVMediaType.video)
do {
let input = try AVCaptureDeviceInput(device: captureDevice!)
if (captureSession?.canAddInput(input) != nil) {
captureSession?.addInput(input)
stillImageOutput = AVCapturePhotoOutput()
captureSession?.addOutput(stillImageOutput!)
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession!)
previewLayer?.videoGravity = AVLayerVideoGravity.resizeAspect
self.view.layer.addSublayer(previewLayer!)
captureSession?.startRunning()
}
} catch {
}
}
有没有办法删除这个不断增长的动画?这是问题的 gif:
最佳答案
当你改变图层框架时,有一个隐式动画。您可以使用 CATransaction
来禁用动画。
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
CATransaction.begin()
CATransaction.setDisableActions(true)
previewLayer?.frame = self.view.frame
CATransaction.commit()
}
关于swift - 禁用相机 View 增长动画,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/55643640/