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