不推荐使用iOS设备WithMediaType

问题描述

我当前正在使用方法:

NSArray *captureDevices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];

获取设备列表，但XCode向我发出警告:

to get a list of devices but XCode is giving me a warning:

Use AVCaptureDeviceDiscoverySession instead

我查看了文档，但不知道如何访问设备数组

I have looked at the documentation but do not know how to access the devices array

AVCaptureDeviceDiscoverySession *session = [[AVCaptureDeviceDiscoverySession alloc]init];
???

推荐答案

创建 AVCaptureDeviceDiscoverySession 根据您的要求，然后调用devices方法获取与会话标准匹配的当前可用设备的Array

Create AVCaptureDeviceDiscoverySession for your requirement and then call devices method to get Array of currently available devices matching the session’s criteria

代码:

AVCaptureDeviceDiscoverySession *captureDeviceDiscoverySession = [AVCaptureDeviceDiscoverySession discoverySessionWithDeviceTypes:@[AVCaptureDeviceTypeBuiltInWideAngleCamera] 
                                      mediaType:AVMediaTypeVideo 
                                       position:AVCaptureDevicePositionBack];
NSArray *captureDevices = [captureDeviceDiscoverySession devices];

### Swift 4

###Swift 4

let discoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInWideAngleCamera], mediaType: .video, position: .back)

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