iOS開發中對於網路攝影機的一些基本使用方法分享_IOS

在一些應用中，我們需要用到iOS裝置的網路攝影機進行拍照，視頻。並且從相簿中選取我們需要的圖片或者視頻。
關於iOS網路攝影機和相簿的應用，可以使用UIImagePickerController類來完成控制。

UIImagePickerController 這個類可以為大家提供照相的功能,以及圖片,視頻瀏覽的功能。

檢查硬體是否安裝有網路攝影機或者允許操作相簿

複製代碼 代碼如下:

#pragma mark - 網路攝影機和相簿相關的公用類

// 判斷裝置是否有網路攝影機
- (BOOL) isCameraAvailable{
return [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];
}

// 前面的網路攝影機是否可用
- (BOOL) isFrontCameraAvailable{
return [UIImagePickerControllerisCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront];
}

// 後面的網路攝影機是否可用
- (BOOL) isRearCameraAvailable{
return [UIImagePickerControllerisCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
}

調用網路攝影機

複製代碼 代碼如下:

- (BOOL) hasMultipleCameras {
NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
if (devices != nil && [devices count] > 1) return YES;
return NO;
}

- (AVCaptureDevice *)cameraWithPosition : (AVCaptureDevicePosition) position
{
NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
for (AVCaptureDevice *device in devices )
if ( device.position == position )
return device;

return nil ;
}

- (void) swapFrontAndBackCameras {
//check for available cameras!
if (![self hasMultipleCameras]) return;

//assumes session is running
NSArray *inputs = self.captureSession.inputs; //should only be one value!
for ( AVCaptureDeviceInput *captureDeviceInput in inputs ) {
AVCaptureDevice *device = captureDeviceInput.device ;
if ( [device hasMediaType:AVMediaTypeVideo ] ) {
AVCaptureDevicePosition position = device.position ;
AVCaptureDevice *newCamera = nil ;
AVCaptureDeviceInput *newInput = nil ;

if (position == AVCaptureDevicePositionFront)
newCamera = [self cameraWithPosition:AVCaptureDevicePositionBack];
else
newCamera = [self cameraWithPosition:AVCaptureDevicePositionFront];

[self initializeCaptureDevice:newCamera];
newInput = [AVCaptureDeviceInput deviceInputWithDevice:newCamera error:nil];

// beginConfiguration ensures that pending changes are not applied immediately
[self.captureSession beginConfiguration ];

[self.captureSession removeInput:captureDeviceInput]; //remove current
[self.captureSession addInput:newInput]; //add new

// Changes take effect once the outermost commitConfiguration is invoked.
[self.captureSession commitConfiguration];
break ;
}
}
}

上面的代碼是使用自拍和後置網路攝影機！