在iPhone应用程序中检测摄像头的存在？
我正在写一个iOS应用程序，我需要能够检测到设备是否有摄像头。 以前，我会检查设备是不是iPhone，因为只有iPhone有一个摄像头 – 但随着iPod Touch 4的推出，这不再是一个可行的select。 该应用程序没有相机的function，但相机的存在增加了function。
那么，任何人都可以给我提供代码，返回是否有摄像头？
您可以在UIImagePickerController中使用+isSourceTypeAvailable:方法：
if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera]) // Has camera
是的，有一个API可以做到这一点：
BOOL isCamera = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];
如果您正在使用AV Foundation类而不是UIImagePickerController，则可以执行以下操作：
BOOL hasCamera = ([[AVCaptureDevice devices] count] > 0);
如果您使用的是UIImagePickerController，则可能不值得，因为您必须将AVFoundation.framework添加到您的项目中。
迅速：
if UIImagePickerController.isSourceTypeAvailable(.Camera){ //Your code goes here //For example you can print available media types: print(UIImagePickerController.availableMediaTypesForSourceType(.Camera)) }
SWIFT 3
正如Juan Boero所写的那样：
if UIImagePickerController.isSourceTypeAvailable(.camera){ }
但我会添加另一个检查，看看用户是否允许访问相机，如苹果build议在他们的PhotoPicker示例（ PhotoPicker示例Objective-C ）：
*请注意你必须导入AVFoundation
let authStatus = AVCaptureDevice.authorizationStatus(forMediaType: AVMediaTypeVideo) if authStatus == AVAuthorizationStatus.denied { // Denied access to camera // Explain that we need camera access and how to change it. let dialog = UIAlertController(title: "Unable to access the Camera", message: "To enable access, go to Settings > Privacy > Camera and turn on Camera access for this app.", preferredStyle: UIAlertControllerStyle.alert) let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil) dialog.addAction(okAction) self.present(dialog, animated:true, completion:nil) } else if authStatus == AVAuthorizationStatus.notDetermined { // The user has not yet been presented with the option to grant access to the camera hardware. // Ask for it. AVCaptureDevice.requestAccess(forMediaType: AVMediaTypeVideo, completionHandler: { (grantd) in // If access was denied, we do not set the setup error message since access was just denied. if grantd { // Allowed access to camera, go ahead and present the UIImagePickerController. self.showImagePickerForSourceType(sourceType: UIImagePickerControllerSourceType.camera) } }) } else { // Allowed access to camera, go ahead and present the UIImagePickerController. self.showImagePickerForSourceType(sourceType: UIImagePickerControllerSourceType.camera) } func showImagePickerForSourceType(sourceType: UIImagePickerControllerSourceType) { let myPickerController = UIImagePickerController() myPickerController.delegate = self; myPickerController.sourceType = sourceType self.present(myPickerController, animated: true, completion: nil) }
如果您需要知道设备是否具有前置或后置摄像头，请使用以下命令：
isCameraAvailable = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront];
检查相机是可用的（Swift）
if(!UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera))
