IOS自定义相机

//捕获设备，通常是前置摄像头，后置摄像头，麦克风（音频输入）

@property(nonatomic, strong) AVCaptureDevice *device;

//AVCaptureDeviceInput 代表输入设备，他使用AVCaptureDevice 来初始化

@property(nonatomic, strong) AVCaptureDeviceInput *input;

//输出图片

@property(nonatomic ,strong) AVCaptureStillImageOutput *imageOutput;

//session：由他把输入输出结合在一起，并开始启动捕获设备（摄像头）

@property(nonatomic, strong) AVCaptureSession *session;

//图像预览层，实时显示捕获的图像

@property(nonatomic ,strong) AVCaptureVideoPreviewLayer *previewLayer;

- (void)cameraDistrict{

self.device = [self cameraWithPosition:AVCaptureDevicePositionBack];//后置摄像头

self.input = [[AVCaptureDeviceInput alloc] initWithDevice:self.device error:nil];

self.imageOutput = [[AVCaptureStillImageOutput alloc] init];

self.session = [[AVCaptureSession alloc] init];

//    拿到的图像的大小可以自行设定

self.session.sessionPreset = AVCaptureSessionPreset640x480;

//输入输出设备结合

if ([self.session canAddInput:self.input]) {

[self.session addInput:self.input];

}

if ([self.session canAddOutput:self.imageOutput]) {

[self.session addOutput:self.imageOutput];

}

//预览层的生成 

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];

//设备取景开始

[self.session startRunning];

if ([_device lockForConfiguration:nil]) {

//自动闪光灯，

if ([_device isFlashModeSupported:AVCaptureFlashModeAuto]) {

[_device setFlashMode:AVCaptureFlashModeAuto];

}

//自动白平衡

if ([_device isWhiteBalanceModeSupported:AVCaptureWhiteBalanceModeAutoWhiteBalance]) {

[_device setWhiteBalanceMode:AVCaptureWhiteBalanceModeAutoWhiteBalance];

}

[_device unlockForConfiguration];

}

}

//拍照按钮点击事件

- (void)photoBtnDidClick

{

AVCaptureConnection *conntion = [self.imageOutput connectionWithMediaType:AVMediaTypeVideo];

if (!conntion) {

NSLog(@"拍照失败!");

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];

}