//捕獲設備，通常是前置攝像頭，后置攝像頭，麥克風（音頻輸入）
@property(nonatomic, strong) AVCaptureDevice *device;
//AVCaptureDeviceInput 代表輸入設備，他使用AVCaptureDevice 來初始化
@property(nonatomic, strong) AVCaptureDeviceInput *input;
//輸出圖片
@property(nonatomic ,strong) AVCaptureStillImageOutput *imageOutput;
//session：由他把輸入輸出結合在一起，并開始啟動捕獲設備（攝像頭）
@property(nonatomic, strong) AVCaptureSession *session;
//圖像預覽層，實時顯示捕獲的圖像
@property(nonatomic ,strong) AVCaptureVideoPreviewLayer *previewLayer;
- (void)cameraDistrict{
self.device = [self cameraWithPosition:AVCaptureDevicePositionBack];//后置攝像頭
self.input = [[AVCaptureDeviceInput alloc] initWithDevice:self.device error:nil];
self.imageOutput = [[AVCaptureStillImageOutput alloc] init];
self.session = [[AVCaptureSession alloc] init];
//? ? 拿到的圖像的大小可以自行設定
self.session.sessionPreset = AVCaptureSessionPreset640x480;
//輸入輸出設備結合
if ([self.session canAddInput:self.input]) {
[self.session addInput:self.input];
}
if ([self.session canAddOutput:self.imageOutput]) {
[self.session addOutput:self.imageOutput];
}
//預覽層的生成?
self.previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];
self.previewLayer.frame = CGRectMake(0, 0, screenWidth, screenHeight-94);
self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
[self.view.layer addSublayer:self.previewLayer];
//設備取景開始
[self.session startRunning];
if ([_device lockForConfiguration:nil]) {
//自動閃光燈，
if ([_device isFlashModeSupported:AVCaptureFlashModeAuto]) {
[_device setFlashMode:AVCaptureFlashModeAuto];
}
//自動白平衡
if ([_device isWhiteBalanceModeSupported:AVCaptureWhiteBalanceModeAutoWhiteBalance]) {
[_device setWhiteBalanceMode:AVCaptureWhiteBalanceModeAutoWhiteBalance];
}
[_device unlockForConfiguration];
}
}
//拍照按鈕點擊事件
- (void)photoBtnDidClick
{
AVCaptureConnection *conntion = [self.imageOutput connectionWithMediaType:AVMediaTypeVideo];
if (!conntion) {
NSLog(@"拍照失敗!");
return;
}
[self.imageOutput captureStillImageAsynchronouslyFromConnection:conntion completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
if (imageDataSampleBuffer == nil) {
return ;
}
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
//self.image = [UIImage imageWithData:imageData];
//停止抓取
[self.session stopRunning];
}
