swift - 如何快速锁定 AVfoundation 中的白平衡？

Question

我试图将我的 iPhone 后置摄像头的白平衡锁定到当前状态，但我在将 objective-c 代码转换为 swift 时遇到了麻烦。这是 objective-c 中的代码:

[device setWhiteBalanceMode:AVCaptureWhiteBalanceModeLocked];

我认为 swift 中的代码应该是这样的:

captureDevice.setWhiteBalanceMode(AVCaptureWhiteBalanceMode.Locked)

Xcode 告诉我:

'AVCaptureDevice' does not have a member named 'setWhiteBalanceMode'

Answer 1

        if captureDevice.lockForConfiguration(nil) {
            var gains: AVCaptureWhiteBalanceGains = AVCaptureWhiteBalanceGainsCurrent
            captureDevice.setWhiteBalanceModeLockedWithDeviceWhiteBalanceGains(gains, completionHandler:nil);
            captureDevice.unlockForConfiguration()
        }