iOS 10.2 - 激活 Retina 闪光灯而不是带有手电筒的背面 LED

Question

有没有一种方法可以让设备在设置 setTorchModeOnWithLevel 时激活 Retina 闪光灯（iPhone6s/7 的正面闪光灯）而不是背面的 True-Tone LED闪光灯？

以下标准代码似乎只能激活后部 LED：

AVCaptureDevice.defaultDevice(withDeviceType: AVCaptureDeviceType.builtInDualCamera,
     mediaType: AVMediaTypeVideo, position: .front)
try device.lockForConfiguration();
let torchOn = !device.isTorchActive;
try device.setTorchModeOnWithLevel(1.0);
device.unlockForConfiguration();

iOS 中是否存在 API 以便可以访问 Retina Flash？

Answer 1

AFAIK iOS 不要有任何 API 特定于 Retina Flash。 （截至日期 iOS 10.2）

来自 Apple 开发者 thread

Retina Flash iPhone 6s and 6s Plus contain a custom display chip that allows the retina display to briefly flash 3 times brighter than its usual maximum illuminance. No new API was added to support this feature. Since iOS 4, AVCaptureDevice has supported the -hasFlash, -isFlashModeSupported: and -flashMode properties. The iPhone 6s and 6s Plus front-facing cameras are the first front-facing iOS cameras to respond YES to the -hasFlash property. By setting the front-facing camera's flashMode to AVCaptureFlashModeOn or AVCaptureFlashModeAuto, the retina flash fires when a still image is captured (see AVCaptureStillImageOutput’s captureStillImageAsynchronouslyFromConnection:completionHandler:), just as the True Tone flash fires for rear-facing camera stills.

因此，要使您的代码正常工作，请检查 -hasFlash，然后将 Flash 模式设置为自动或开启。

iOS 10.2 - 激活 Retina 闪光灯而不是带有手电筒的背面 LED

iOS 10.2 - Activate Retina Flash instead of Back LED with Torch

avfoundation

ios

retina

swift