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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(chuàng)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(tài)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(chuàng)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(chuàng)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(chuàng)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

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AVFoundation 自定義相機

AVFoundation 自定義相機

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AVFoundation 自定義相機

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三个男躁一个女,国精产品一区一手机的秘密,麦子交换系列最经典十句话,欧美国产综合欧美视频