iOS拍照定制之AVCapturePhotoOutput

Posted 2021-09-29 善斋书屋

• 问题

  领导安排任务，写个拍照功能，界面跟系统拍照有点出入

  拍完照片，底部显示已拍照片，有个拍照上限[在此不论]

  点击已拍照片，可以预览、放大缩小查看

• 思路

  系统拍照肯定不行了，只能定制，没提是否拍照禁止声音的需求[非偷拍，正经人]

  原则上能简单就不复杂，拍砖AVCapturePhotoOutput

• 捋捋

  首先，你需要一块暂时当前场景的layer，这里不提，参考上篇[ios写在定制相机之前]

  其次，定义session + photoOutput

  再次，定义拍照事件

  最后，代理中获得照片

• 上菜

  • session定义 input设置

    self.session = [[AVCaptureSession alloc] init];
    self.session.sessionPreset = AVCaptureSessionPresetPhoto;
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    self.dInput = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
    if ([self.session canAddInput:self.dInput]) {
        [self.session addInput:self.dInput];
    }

  • 拍照场景layer

    self.preView = [[AVPreView alloc] init];
    self.preView.backgroundColor = [UIColor colorWithHexs:0x3f3f3f];
    self.preView.session = self.session;
    [self.preView setVideoOrientation:AVCaptureVideoOrientationLandscapeRight];
    [self.view addSubview:self.preView];
    [self.preView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.view);
        make.top.equalTo(self.topView.mas_bottom);
        make.bottom.equalTo(self.collect.mas_top);
        make.right.equalTo(rightView.mas_left);
    }];

  • 设置photoOutput

    self.photoOutput = [[AVCapturePhotoOutput alloc] init];
    if ([self.session canAddOutput:self.photoOutput]) {
        [self.session addOutput:self.photoOutput];
    }
    [self.photoOutput.connections.lastObject setVideoOrientation:AVCaptureVideoOrientationLandscapeRight];

  • session start

    [self.session startRunning];

  • 拍照点击

    AVCapturePhotoSettings *set = [AVCapturePhotoSettings photoSettings];
    [self.photoOutput capturePhotoWithSettings:set delegate:self];

  • AVCapturePhotoCaptureDelegate

    #pragma mark - AVCapturePhotoCaptureDelegate
    -(void)captureOutput:(AVCapturePhotoOutput *)output didFinishProcessingPhoto:(AVCapturePhoto *)photo error:(NSError *)error  API_AVAILABLE(ios(11.0)) {
        if (!error) {
            // 使用该方式获取图片，可能图片会存在旋转问题，在使用的时候调整图片即可
            NSData *data = [photo fileDataRepresentation];
            UIImage *image = [UIImage imageWithData:data];
            
            // 对，就是上面的image
        }
    }
    

• Game Over.

  See me Tomorrow, haha