最近想研究一下AVFoundation，所以產生了這篇博客，歡迎大家指正
參考大神博客鏈接
使用 AVFoundation 拍照好而錄制視頻的一般步驟
1、創建AVCaptureSession對象。AVCaptureSession：媒體捕捉會話，負責把捕獲的音視頻數據輸出到輸出設備中，一個AVCaptureSession可以有多個輸入輸出。
2、使用AVCaptureDevice的靜態方法獲得需要使用的設備。AVCaptureDevice：輸入設備，包括麥克風、攝像頭等，通過該對象可以設置物理設備的屬性，如相機聚焦、白平衡。
3、利用輸入設備AVCaptureDevice初始化AVCaptureDeviceInput對象。AVCaptureDeviceInput：設備輸入數據管理對象，可以根據AVCaptureDevice創建對應的AVCaptureDeviceInput對象，該對象會被添加到AVCaptureSeeeion中管理。
4、初始化輸出數據管理對象AVCaptureOutput，如果拍照就初始化AVCapturePhotoOutput對象，如果視頻錄制就初始化AVCaptureMovieFileOutput對象。AVCaptureOutput：用于接受各類的輸出數據，通常使用對應的子類，如AVCaptureAudioDataOutput、AVCapturePhotoOutput、AVCaptureVideoDataOutput、AVCaptureFileOutput。該對象也會被添加到AVCaptureSession管理。
5、將數據輸入對象AVCaptureDeviceInput和數據輸出對象AVCaptureOutput添加到AVCaptureSession管理。
6、創建視頻預覽圖層AVCaptureVideoPreviewLayer并指定媒體會話，添加圖層到顯示器中，挑用AVCaptureSession 的 startRuning 方法開始捕獲。AVCaptureVideoPreviewLayer：相機拍攝預覽圖層，是CALayer的子類，使用該對象可以實時查看拍照或視頻錄制效果，創建該對象需要指定對應的AVCaptureSession對象。
7、將捕獲的音頻或視頻數據輸出到指定文件。
其核心代碼如下
.h文件
#import <UIKit/UIKit.h>
@interface PhotoView : UIView
- (instancetype)initWithFrame:(CGRect)frame completeHandle:(void (^)(UIImage * photo))completeHandle;
- (void)start;
- (void)stop;
@end
.m文件
#import "PhotoView.h"
#import <AVFoundation/AVFoundation.h>
typedef void(^CompleteHandle)(UIImage * photo);
@interface PhotoView ()<AVCapturePhotoCaptureDelegate>
@property (nonatomic, strong) AVCaptureSession * captureSession;
/**AVCaptureDeviceInput*/
@property (nonatomic, strong)AVCaptureDeviceInput * deviceInput;
/**AVCaptureOutput*/
@property (nonatomic, strong)AVCapturePhotoOutput * photoOutput;
@property (nonatomic, strong)AVCaptureDevice * device;
@property (nonatomic, copy)CompleteHandle completeHandle;
@end
@implementation PhotoView
- (instancetype)initWithFrame:(CGRect)frame completeHandle:(void (^)(UIImage *))completeHandle{
if (self = [super initWithFrame:frame]) {
self.completeHandle = completeHandle;
[self configCamera];
[self setUserInterface];
}
return self;
}
- (void)setUserInterface
{
NSArray * leftBtnTitles = @[@"auto",@"open",@"close"];
CGFloat btnSize = 30.f;
CGFloat width = self.bounds.size.width;
CGFloat height = self.bounds.size.height;
CGFloat margin = 30.f;
for (int i = 0; i < leftBtnTitles.count; i ++) {
UIButton * button = [[UIButton alloc] initWithFrame:CGRectMake(10, (margin + btnSize) * i + margin , btnSize, btnSize)];
[button setImage:[UIImage imageNamed:leftBtnTitles[i]] forState:UIControlStateNormal];
[button addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
button.tag = 100 + i;
[self addSubview:button];
}
NSArray * rightBtnTitles = @[@"change"];
for (int i = 0; i < rightBtnTitles.count; i ++) {
UIButton * button = [[UIButton alloc] initWithFrame:CGRectMake(width - btnSize - 10, (margin + btnSize) * i + margin , btnSize, btnSize)];
[button setImage:[UIImage imageNamed:rightBtnTitles[i]] forState:UIControlStateNormal];
[button addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
button.tag = 200 + i;
[self addSubview:button];
}
UIButton *takeButton = [UIButton buttonWithType:UIButtonTypeCustom];
takeButton.frame = CGRectMake((width - 60) / 2, height - 70, 60, 60);
[takeButton setImage:[UIImage imageNamed:@"carema"] forState:UIControlStateNormal];
[takeButton addTarget:self action:@selector(takePhoto) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:takeButton];
}
- (void)configCamera
{
self.captureSession = [[AVCaptureSession alloc] init];
if ([self.captureSession canSetSessionPreset:AVCaptureSessionPreset1920x1080]) {
[self.captureSession setSessionPreset:AVCaptureSessionPreset1920x1080];
}
self.device = [self cameraDeviceWithPosition:AVCaptureDevicePositionBack];
[self deviceFouceModeForType:AVCaptureFocusModeContinuousAutoFocus];
self.deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];
self.photoOutput = [[AVCapturePhotoOutput alloc] init];
if ([self.captureSession canAddInput:self.deviceInput]) {
[self.captureSession addInput:self.deviceInput];
}
if ([self.captureSession canAddOutput:self.photoOutput]) {
[self.captureSession addOutput:self.photoOutput];
}
AVCaptureVideoPreviewLayer * previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession];
previewLayer.frame = CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height);
[self.layer addSublayer:previewLayer];
}
/**
* 獲取AVCaptureDevice
*/
- (AVCaptureDevice *)cameraDeviceWithPosition:(AVCaptureDevicePosition)position
{
AVCaptureDeviceDiscoverySession * dev_dis_session = [AVCaptureDeviceDiscoverySession discoverySessionWithDeviceTypes:@[AVCaptureDeviceTypeBuiltInWideAngleCamera] mediaType:AVMediaTypeVideo position:position];
if (dev_dis_session.devices.count > 0) {
return [dev_dis_session.devices firstObject];
}
return nil;
}
- (void)start
{
[self.captureSession startRunning];
}
- (void)stop
{
[self.captureSession stopRunning];
}
/**
* 拍照
*/
- (void)takePhoto
{
NSDictionary * output_set = @{AVVideoCodecKey:AVVideoCodecJPEG};
AVCapturePhotoSettings * photoset = [AVCapturePhotoSettings photoSettingsWithFormat:output_set];
[self.photoOutput capturePhotoWithSettings:photoset delegate:self ];
}
- (void)captureOutput:(AVCapturePhotoOutput *)captureOutput didFinishProcessingPhotoSampleBuffer:(nullable CMSampleBufferRef)photoSampleBuffer previewPhotoSampleBuffer:(nullable CMSampleBufferRef)previewPhotoSampleBuffer resolvedSettings:(AVCaptureResolvedPhotoSettings *)resolvedSettings bracketSettings:(nullable AVCaptureBracketedStillImageSettings *)bracketSettings error:(nullable NSError *)error {
if (!error) {
NSData *data = [AVCapturePhotoOutput JPEGPhotoDataRepresentationForJPEGSampleBuffer:photoSampleBuffer previewPhotoSampleBuffer:previewPhotoSampleBuffer];
UIImage *image = [UIImage imageWithData:data];
// 拍照后調用
UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
}
}
- (void)image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo {
if(!error){
self.completeHandle(image);//拍照之后傳照片給控制器
}
}
- (void)btnClick:(UIButton *)sender
{
if (sender.tag == 100) {
// 自動
[self deviceTorModeForType:AVCaptureTorchModeAuto]; // 閃光燈 - 自動
}
if (sender.tag == 101) {
[self deviceTorModeForType:AVCaptureTorchModeOn]; // 閃光燈 - 打開
}
if (sender.tag == 102) {
[self deviceTorModeForType:AVCaptureTorchModeOff]; // 閃光燈 - 關閉
}
if (sender.tag == 200) {
// 調換攝像頭
[self switchingCamera];
}
}
/**
* 切換攝像頭
*/
- (void)switchingCamera
{
AVCaptureDevicePosition currentPosition = self.deviceInput.device.position;
AVCaptureDevice * device;
if (currentPosition == AVCaptureDevicePositionBack) {
if ([self.captureSession canSetSessionPreset:AVCaptureSessionPreset1280x720]) {
[self.captureSession setSessionPreset:AVCaptureSessionPreset1280x720];
}
device = [self cameraDeviceWithPosition:AVCaptureDevicePositionFront];
}
if (currentPosition == AVCaptureDevicePositionFront) {
if ([self.captureSession canSetSessionPreset:AVCaptureSessionPreset1920x1080]) {
[self.captureSession setSessionPreset:AVCaptureSessionPreset1920x1080];
}
device = [self cameraDeviceWithPosition:AVCaptureDevicePositionBack];
}
AVCaptureDeviceInput * deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
[self.captureSession beginConfiguration];
[self.captureSession removeInput:self.deviceInput];
if ([self.captureSession canAddInput:deviceInput]) {
[self.captureSession addInput:deviceInput];
self.deviceInput = deviceInput;
self.device = device;
}
[self deviceFouceModeForType:AVCaptureFocusModeContinuousAutoFocus];
[self.captureSession commitConfiguration];
}
- (void)deviceTorModeForType:(AVCaptureTorchMode)type
{
if ([self.device hasTorch]) {
BOOL locked = [self.device lockForConfiguration:nil];
if (locked) {
self.device.torchMode = type;
[self.device unlockForConfiguration];
}
}
}
/**
* 聚焦
*/
- (void)deviceFouceModeForType:(AVCaptureFocusMode)type
{
if ([self.device isFocusModeSupported:type]) {
BOOL locked = [self.device lockForConfiguration:nil];
if (locked) {
// 開啟
self.device.focusMode = type;
[self.device unlockForConfiguration];
}
}
}
@end
控制器
#import "ViewController.h"
#import "PhotoView.h"
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self setUserInterface];
}
- (void)setUserInterface
{
PhotoView * view = [[PhotoView alloc] initWithFrame:self.view.bounds completeHandle:^(UIImage * photo){
NSLog(@"%@",photo);
}];
[self.view addSubview:view];
[view start];
}
demo 歡迎 star
