Open Radar

 
Summary:
The API "setFocusModeLockedWithLensPosition" is called without first checking that AVCaptureFocusModeLocked is supported for that camera device (In AAPLCameraViewController.m)

Steps to Reproduce:
1. Attach an iOS 8 device (Tested with iPad Mini 2, iPhone 5s)
1. Run the sample code App ("AVCamManual")
2. Tap the "Camera" labeled button at the button once to switch to the Front-Facing-Camera
3. Select "Focus" at the Segment control at the top
4. Move the "Position" Slider control
5. Observe the crash

Expected Results:
Add a line  that checks whether 'AVCaptureFocusModeLocked' is supported before calling 'setFocusModeLockedWithLensPosition' in the sample code


Actual Results:
No check is performed, the Sample App crashes

Version:
AVCamManual https://developer.apple.com/library/ios/samplecode/AVCamManual/Introduction/Intro.html#//apple_ref/doc/uid/TP40014578

Notes:
Perhaps have the documentation above 'setFocusModeLockedWithLensPosition' in AVCaptureDevice.h updated to include the scenario in which this NSInvalidArgumentException is thrown

Configuration:
It will only occur if a Camera video device which does not support "Focus mode locked" is selected (The front-facing camera)