关于ios:iOS拍照定制之AVCapturePhotoOutput

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问题
领导安顿工作，写个拍照性能，界面跟零碎拍照有点出入

拍完照片，底部显示已拍照片，有个拍照下限 [在此不管]

点击已拍照片，能够预览、放大放大查看
思路
零碎拍照必定不行了，只能定制，没提是否拍照禁止声音的需要 [非偷拍，正经人]

原则上能简略就不简单，拍砖 AVCapturePhotoOutput
捋捋
首先，你须要一块临时以后场景的 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

最初，代理中取得照片

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) {
        // 应用该形式获取图片，可能图片会存在旋转问题，在应用的时候调整图片即可
        NSData *data = [photo fileDataRepresentation];
        UIImage *image = [UIImage imageWithData:data];
        
        // 对，就是下面的 image
    }
}