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如何用AVFoundation框架实现相机拍照和录制视频
本篇文章为大家展示了如何用AVFoundation框架实现相机拍照和录制视频，代码简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
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这里是Demo
首先声明以下对象：
#import "CustomeCameraViewController.h" #import#import @interface CustomeCameraViewController () { // AVCaptureSession对象来执行输入设备和输出设备之间的数据传递 AVCaptureSession *iSession; //当前设备 AVCaptureDevice *iDevice; //输入设备 AVCaptureDeviceInput *iDeviceInput; //照片输出流 AVCaptureStillImageOutput *iStillImageOutput; //预览图层 AVCaptureVideoPreviewLayer *iPreviewLayer; }
初始化各对象:
-(void)viewDidLoad {
[super viewDidLoad];
//点击屏幕对焦
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(focusTap:)];
[self.view addGestureRecognizer:tap];
iSession = [[AVCaptureSession alloc]init];
NSArray *deviceArray = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
for (AVCaptureDevice *device in deviceArray) {
//AVCaptureDevicePositionBack 后置摄像头
//AVCaptureDevicePositionFront 前置摄像头
if (device.position == AVCaptureDevicePositionBack) {
iDevice = device;
}
}
iSession.sessionPreset = [self getSessionPresetForDevice:iDevice];
iDeviceInput = [[AVCaptureDeviceInput alloc]initWithDevice:iDevice error:nil];
////输出设置。AVVideoCodecJPEG 输出jpeg格式图片
iStillImageOutput = [[AVCaptureStillImageOutput alloc]init];
NSDictionary *outputDic = [NSDictionary dictionaryWithObjectsAndKeys:AVVideoCodecJPEG,AVVideoCodecKey, nil nil];
[iStillImageOutput setOutputSettings:outputDic];
//更改这个设备设置的时候必须先锁定设备，修改完后再解锁，否则崩溃
[iDevice lockForConfiguration:nil];
if ([iDevice isFlashModeSupported:AVCaptureFlashModeOff]) {
[iDevice setFlashMode:AVCaptureFlashModeOff];
}
if ([iDevice isFocusModeSupported:AVCaptureFocusModeAutoFocus]) {
[iDevice setFocusMode:AVCaptureFocusModeAutoFocus];
}
if ([iDevice isWhiteBalanceModeSupported:AVCaptureWhiteBalanceModeAutoWhiteBalance]) {
[iDevice setWhiteBalanceMode:AVCaptureWhiteBalanceModeAutoWhiteBalance];
}
[iDevice unlockForConfiguration];
if ([iSession canAddInput:iDeviceInput]) {
[iSession addInput:iDeviceInput];
}
if ([iSession canAddOutput:iStillImageOutput]) {
[iSession addOutput:iStillImageOutput];
}
if ([iSession canAddOutput:iVideoOutput]) {
[iSession addOutput:iVideoOutput];
}
//初始化预览图层
iPreviewLayer = [[AVCaptureVideoPreviewLayer alloc]initWithSession:iSession];
[iPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
iPreviewLayer.frame = CGRectMake(0, 60, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height-160);
[self.iCameraView.layer addSublayer:iPreviewLayer];
[iSession startRunning];
}点击按钮拍照：
//拍照
-(void)takePictures{
AVCaptureConnection *connection = [iStillImageOutput connectionWithMediaType:AVMediaTypeVideo];
if (!connection) {
NSLog(@"失败");
return;
}
//设置焦距
[connection setVideoScaleAndCropFactor:1];
[iStillImageOutput captureStillImageAsynchronouslyFromConnection:connection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
if (imageDataSampleBuffer==NULL) {
NSLog(@"NUll");
return ;
}
NSData *data = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
UIImage *image = [UIImage imageWithData:data];
}];
}image即为拍照所得图片.
设置session的AVCaptureSessionPreset属性
-(NSString *)getSessionPresetForDevice:(AVCaptureDevice *)device{
if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPreset3840x2160]) {
return AVCaptureSessionPreset3840x2160;
} else if([device supportsAVCaptureSessionPreset:AVCaptureSessionPreset1920x1080]){
return AVCaptureSessionPreset1920x1080;
} else if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPreset1280x720]){
return AVCaptureSessionPreset1280x720;
} else if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPreset640x480]){
return AVCaptureSessionPreset640x480;
} else if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPreset352x288]){
return AVCaptureSessionPreset352x288;
} else if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPresetHigh]){
return AVCaptureSessionPresetHigh;
} else if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPresetMedium]){
return AVCaptureSessionPresetMedium;
} else{
return AVCaptureSessionPresetLow;
}
}设置闪光灯:
- (IBAction)iFlashBtn:(id)sender {
[iDevice lockForConfiguration:nil];
if (iDevice.flashMode == AVCaptureFlashModeOff) {
if ([iDevice isFlashModeSupported:AVCaptureFlashModeOn]) {
[iDevice setFlashMode:AVCaptureFlashModeOn];
[self.iFlashBtn setBackgroundImage:[UIImage imageNamed:@"flashBtn"] forState:UIControlStateNormal];
}
} else if (iDevice.flashMode == AVCaptureFlashModeOn){
if ([iDevice isFlashModeSupported:AVCaptureFlashModeOff]) {
[iDevice setFlashMode:AVCaptureFlashModeOff];
[self.iFlashBtn setBackgroundImage:[UIImage imageNamed:@"flashOffBtn"] forState:UIControlStateNormal];
}
}
[iDevice unlockForConfiguration];
}切换前置摄像头与后置摄像头:
- (IBAction)iChangeBtn:(id)sender {
NSArray *array = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
AVCaptureDevice *newDevice = nil;
AVCaptureDeviceInput *newDeviceInput = nil;
CATransition *animation = [CATransition animation];
animation.duration = 0.5f;
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
animation.type = @"oglFlip";
if (iDevice.position == AVCaptureDevicePositionBack) {
animation.subtype = kCATransitionFromLeft;
for (AVCaptureDevice *device in array) {
if (device.position == AVCaptureDevicePositionFront) {
newDevice = device;
}
}
} else if (iDevice.position == AVCaptureDevicePositionFront){
animation.subtype = kCATransitionFromRight;
for (AVCaptureDevice *device in array) {
if (device.position == AVCaptureDevicePositionBack) {
newDevice = device;
}
}
}
newDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:newDevice error:nil];
[iPreviewLayer addAnimation:animation forKey:nil];
if (newDeviceInput!=nil) {
[iSession beginConfiguration];
[iSession removeInput:iDeviceInput];
iSession.sessionPreset = [self getSessionPresetForDevice:newDevice];
if ([iSession canAddInput:newDeviceInput]) {
[iSession addInput:newDeviceInput];
iDeviceInput = newDeviceInput;
iDevice = newDevice;
} else {
[iSession addInput:iDeviceInput];
}
[iSession commitConfiguration];
}
}点击屏幕对焦：
//点击屏幕对焦
-(void)focusTap:(UIGestureRecognizer *)tap{
CGPoint tapPoint = [tap locationInView:self.view];
float Y = tapPoint.y;
if (Y<60 || Y>([UIScreen mainScreen].bounds.size.height-100)) {
return;
}
[iDevice lockForConfiguration:nil];
if ([iDevice isFocusModeSupported:AVCaptureFocusModeAutoFocus]) {
[iDevice setFocusPointOfInterest:CGPointMake(tapPoint.x/self.view.frame.origin.x, tapPoint.y/self.view.frame.origin.y)];
[iDevice setFocusMode:AVCaptureFocusModeAutoFocus];
}
[iDevice unlockForConfiguration];
self.iFocusImgView.center = tapPoint;
self.iFocusImgView.hidden = NO;
[UIView animateWithDuration:0.3 animations:^{
self.iFocusImgView.transform = CGAffineTransformMakeScale(1.25, 1.25);
}completion:^(BOOL finished) {
[UIView animateWithDuration:0.5 animations:^{
self.iFocusImgView.transform = CGAffineTransformIdentity;
} completion:^(BOOL finished) {
self.iFocusImgView.hidden = YES;
}];
}];
}
关于视频录制可以在Demo中查看。
上述内容就是如何用AVFoundation框架实现相机拍照和录制视频，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注创新互联行业资讯频道。
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