这是我的头脑.
我正在从这个示例项目开始工作:https://github.com/jj0b/AROverlayExample
这非常有效.唯一的问题是它是一个肖像应用程序.因此,当我将设备旋转到横向时,视频仍会按需显示,但我的所有标签和UI现在都是横向显示的.
为了解决这个问题,我只在info.plist中设置了格局
问题是这样的:
这是我的代码:
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
self.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
assert( self.autoresizesSubviews );
CGPoint layerRectCenter = CGPointMake( CGRectGetMidX( frame ),
CGRectGetMidY( frame ) );
// Initialization code
self.captureSession = [[[AVCaptureSession alloc] init] autorelease];
// addVideoInput
{
AVCaptureDevice* videoDevice = [AVCaptureDevice defaultDeviceWithMediaType: AVMediaTypeVideo];
if (videoDevice)
{
NSError *error;
AVCaptureDeviceInput* videoIn = [AVCaptureDeviceInput deviceInputWithDevice: videoDevice error:&error];
if ( ! error )
{
if ( [self.captureSession canAddInput:videoIn] )
[self.captureSession addInput:videoIn];
else
NSLog(@"Couldn't add video input");
}
else
NSLog(@"Couldn't create video input");
}
else
NSLog(@"Couldn't create video capture device");
}
// addVideoPreviewLayer
{
self.previewLayer = [[[AVCaptureVideoPreviewLayer alloc] initWithSession: self.captureSession] autorelease];
self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
self.previewLayer.frame = CGRectMake(0, 0, 480, 300);
self.previewLayer.orientation = AVCaptureVideoOrientationLandscapeRight;
//self.previewLayer.frame = frame;
[self.layer addSublayer: self.previewLayer];
}
// run!
[self.captureSession startRunning];
}
return self;
}
我无法弄清楚为什么视频会侧向显示,尽管专门将图层框架设置为横向CGRectMake(0,0,480,300),但它反过来会出现.
最佳答案 一个非常简洁的解决方案是将视图直接添加到窗口.
最好的一点是在根视图控制器中:
// need to add the capture view to the window here: can't do it in viewDidLoad as the window is not ready at that point
- (void) viewDidAppear: (BOOL) animated
{
self.frontCamView = [[[FrontCamView alloc]
initWithFrame: [UIScreen mainScreen].bounds]
autorelease];
self.view.opaque = NO;
self.view.backgroundColor = [UIColor clearColor];
[self.view.window addSubview: self.frontCamView];
[self.view.window sendSubviewToBack: self.frontCamView];
}
然后执行摄像头视图本身:
@interface FrontCamView ( )
@property (retain) AVCaptureVideoPreviewLayer* previewLayer;
@property (retain) AVCaptureSession* captureSession;
@end
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@implementation FrontCamView
@synthesize captureSession;
@synthesize previewLayer;
// - - -
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
self.captureSession = [[[AVCaptureSession alloc] init] autorelease];
// addVideoInput
{
AVCaptureDevice* videoDevice = [AVCaptureDevice defaultDeviceWithMediaType: AVMediaTypeVideo];
if (videoDevice)
{
NSError *error;
AVCaptureDeviceInput* videoIn = [AVCaptureDeviceInput deviceInputWithDevice: videoDevice error:&error];
if ( ! error )
{
if ( [self.captureSession canAddInput:videoIn] )
[self.captureSession addInput:videoIn];
else
NSLog(@"Couldn't add video input");
}
else
NSLog(@"Couldn't create video input");
}
else
NSLog(@"Couldn't create video capture device");
}
// addVideoPreviewLayer
{
CGRect screenRect = [UIScreen mainScreen].bounds;
self.previewLayer = [[[AVCaptureVideoPreviewLayer alloc] initWithSession: self.captureSession] autorelease];
self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
self.previewLayer.frame = screenRect;
self.previewLayer.orientation = AVCaptureVideoOrientationPortrait;
[self.layer addSublayer: self.previewLayer];
}
// run!
[self.captureSession startRunning];
}
return self;
}
- (void) dealloc
{
[self.captureSession stopRunning];
[previewLayer release], previewLayer = nil;
[captureSession release], captureSession = nil;
[super dealloc];
}
@end