Trying to detect then prompt for camera access permissions on ios but the code below.
The output from IsCameraAllowed() is “Camera Access Disabled” because the followign is coming back as false.
if ( native.canShowPopup( "requestAppPermission" ) ) then
local function isValueInTable( haystack, needle )
assert( type(haystack) == “table”, “isValueInTable() : First parameter must be a table.” )
assert( needle ~= nil, “isValueInTable() : Second parameter must be not be nil.” )
for key, value in pairs( haystack ) do
if ( value == needle ) then
return true
end
end
return false
end
– Helper function that lets us know that we can use media.capturePhoto().
local function canUseMediaCapturePhoto()
– Ensure that can use the camera.
local hasAccessToCamera, hasCamera = media.hasSource( media.Camera )
if ( not hasCamera ) then
print( “Device does not have a camera!” )
return false
elseif ( not hasAccessToCamera ) then
print( “Lacking camera permission!” )
return false
end
– Ensure that we have permission to use external storage. We do not need
– to check for camera permission explicitly, because media.hasSource does that
– for us (see hasAccessToCamera above).
local grantedPermissions = system.getInfo(“grantedAppPermissions”)
if ( grantedPermissions ) then
if ( not isValueInTable( grantedPermissions, “Storage” ) ) then
print( “Lacking storage permission!” )
return false
end
end
return true
end
– Called when the user has granted or denied the requested permissions.
local function cameraPermissionsListener( event )
– Print out granted/denied permissions.
print( “cameraPermissionsListener( " … json.prettify( event or {} ) … " )” )
– Check again for camera (and storage) access.
– Note that we use our helper function, canUseMediaCapturePhoto(), as the
– permissions listed in the event are ONLY for what has been just denied
– or granted.
if ( canUseMediaCapturePhoto() ) then
–print( “Calling media.capturePhoto() from permissions listener!” )
–media.capturePhoto( { listener = sessionComplete } )
isAROk = true
textCameraOnOff.text = “Camera On”
arCameraCanvas.fill = { type = “camera” }
arCameraCanvas:toBack()
arCameraCanvas.isVisible = true
else
– The user hasn’t given us the required permissions.
– Tell the user to enable it in Settings.
native.showAlert( “Camera Access Required”, “The Augmented Reality mode requires you grant access to the camera. Please go to Settings and grant this app access to the Camera.”, { “OK” } )
– Turn off the camera swicth
onOffSwitch:setState( { isOn=false, isAnimated=true } )
isAROk = false
textCameraOnOff.text = “Camera Off”
arCameraCanvas.isVisible = false
arCameraCanvas:toBack()
arCameraCanvas.fill = { type = “none” }
end
end
– Attempt to access the camera.
– We can’t assume that the user has given us permission to use the camera.
local function IsCameraAllowed( event )
– Get access to the Camera!
local hasAccessToCamera, hasCamera = media.hasSource( media.Camera )
if ( canUseMediaCapturePhoto() ) then
– If we have access to the camera, capture a photo.
–print( “Calling media.capturePhoto() from tap listener!” )
–media.capturePhoto( { listener = sessionComplete } )
–native.showAlert( “All GooD”, “Start the AR.”, { “OK” } )
isAROk = true
textCameraOnOff.text = “Camera On”
arCameraCanvas.fill = { type = “camera” }
arCameraCanvas:toBack()
arCameraCanvas.isVisible = true
elseif ( hasCamera ) then
– If we don’t have access to the camera, and a camera is actually available,
– request permission to use it, if we can.
if ( native.canShowPopup( “requestAppPermission” ) ) then
local permissionsToRequest = nil
local rationaleTitleMessage = “media.capturePhoto() needs permissions!”
local rationaleMessage = nil
if system.getInfo( “platformName” ) == “Android” then
– On Android, we also need the Storage permission to use media.capturePhoto().
permissionsToRequest = { “Camera”, “Storage” }
rationaleMessage = “The camera is required to enable the Augmented Reality view!”
else
permissionsToRequest = { “Camera” }
rationaleMessage = “The camera is required to enable the Augmented Reality view!”
end
– Make the actual request from the user.
native.showPopup( “requestAppPermission”, {
appPermission = permissionsToRequest,
urgency = “Normal”,
rationaleTitle = rationaleTitleMessage,
rationaleDescription = rationaleMessage,
listener = cameraPermissionsListener,
} )
else
– The device has a Camera, but we can’t ask for permission to use it.
– Tell the user to enable it in Settings.
native.showAlert( “Camera Access Disabled”, “A camera was found on this device, but we do not have permission to use. Please go to Settings then grant this app access to the Camera.”, { “OK” } )
– Turn off the camera swicth
onOffSwitch:setState( { isOn=false, isAnimated=true } )
isAROk = false
textCameraOnOff.text = “Camera Off”
arCameraCanvas.isVisible = false
arCameraCanvas:toBack()
arCameraCanvas.fill = { type = “none” }
end
else
– The sample requires that we actually have a camera.
native.showAlert( “Camera Not Found”, “A camera device cannot be found on this device. Augmented Reality mode will be disabled.”, { “OK” } )
– Turn off the camera swicth
onOffSwitch:setState( { isOn=false, isAnimated=true } )
isAROk = false
textCameraOnOff.text = “Camera Off”
arCameraCanvas.isVisible = false
arCameraCanvas:toBack()
arCameraCanvas.fill = { type = “none” }
end
return true
end