devicesWithMediaType已被棄用

Question

我有以下代碼：

NSArray * devices = [ AVCaptureDevice devicesWithMediaType: AVMediaTypeVideo ]; 

// 2. Iterate through the device array and if a device is a camera, check if it's the one we want: 
for (AVCaptureDevice * device in devices) 
{ 
    if (useFrontCamera && AVCaptureDevicePositionFront == [ device position ]) 
    { 
     // We asked for the front camera and got the front camera, now keep a pointer to it: 
     m_camera = device; 
    } 
    else if (!useFrontCamera && AVCaptureDevicePositionBack == [ device position ]) 
    { 
     // We asked for the back camera and here it is: 
     m_camera = device; 
    } 
} 

警告說，devicesWithMediaType已被廢棄，我應該使用AVCaptureDeviceDiscoverySession相反，我曾嘗試以下：

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

但數組設備只有我的背部相機而不是我的前置攝像頭，有幫助嗎？

Answer 1

從documentation

通行證AVCaptureDevicePositionUnspecified搜索設備 與位置無關。

因此，使用AVCaptureDevicePositionUnspecified來查找所有捕獲設備。

因此，代碼如下所示：

AVCaptureDeviceDiscoverySession *captureDeviceDiscoverySession = [AVCaptureDeviceDiscoverySession discoverySessionWithDeviceTypes:@[AVCaptureDeviceTypeBuiltInWideAngleCamera] 
             mediaType:AVMediaTypeVideo 
             position: AVCaptureDevicePositionUnspecified]; // here you pass AVCaptureDevicePositionUnspecified to find all capture devices 

NSArray *captureDevices = [captureDeviceDiscoverySession devices];