iOS 摄像头相关

1. 常见 iphone 型号分辨率。

Feature	iPhone 8 iPhone 8 Plus iPhone X	iPhone 7 iPhone 7 Plus	iPhone 6s iPhone 6s Plus	iPhone SE	iPhone 6 iPhone 6 Plus
Notable Video Resolutions and Frame Rates (back camera)	2160p30 (4K) 2160p60 (4K) 1080p30 1080p60	2160p30 (4K) 1080p30 1080p60	2160p30 (4K) 1080p30 1080p60	2160p30 (4K) 1080p30 1080p60	1080p30 1080p60
High Frame Rate (HFR) / Slow Motion Video Formats	1080p240 1080p120 720p240	1080p120 720p240	1080p120 720p240	1080p120 720p240	720p240

2. 摄像机质量设定 (bg57iv3.is2120)
AVCaptureSessionPresetLow
AVCaptureSessionPresetMedium
AVCaptureSessionPresetHigh

3. 分辨率（iOS）
AVCaptureSessionPreset352x288
AVCaptureSessionPreset640x480
AVCaptureSessionPreset1280x720
AVCaptureSessionPreset1920x1080

4. 朝向
AVCaptureVideoOrientationPortrait
AVCaptureVideoOrientationPortraitUpsideDown
AVCaptureVideoOrientationLandscapeLeft
AVCaptureVideoOrientationLandscapeRight

5. 一些设置
 

AVCaptureDevice *captureDevice = [DeviceInfoIosObjC captureDeviceForUniqueId:uniqueId];

if ([captureDevice isFocusModeSupported:AVCaptureFocusModeAutoFocus])
{
    NSError *error;
    if ([captureDevice lockForConfiguration:&error])
    {
        [captureDevice setFocusMode:AVCaptureFocusModeAutoFocus];
        //设置聚焦在设备坐标的中点
        if (captureDevice.focusPointOfInterestSupported)
        {
            captureDevice.focusPointOfInterest = CGPointMake(0.5, 0.5);
        }
    }
    [captureDevice unlockForConfiguration];
}

if ([captureDevice isWhiteBalanceModeSupported:AVCaptureWhiteBalanceModeContinuousAutoWhiteBalance])
{
    NSError *error;
    if ([captureDevice lockForConfiguration:&error])
    {
        [captureDevice setWhiteBalanceMode:AVCaptureWhiteBalanceModeContinuousAutoWhiteBalance];
    }
    [captureDevice unlockForConfiguration];
}

if ([captureDevice isExposureModeSupported:AVCaptureExposureModeContinuousAutoExposure])
{
    NSError *error;
    if ([captureDevice lockForConfiguration:&error])
    {
        [captureDevice setExposureMode:AVCaptureExposureModeContinuousAutoExposure];
    }
    [captureDevice unlockForConfiguration];
}