ios - iPhone 相机访问权限？
<p><p>我想知道如何访问 iphone 相机并实时使用它:例如，只需在相机 View 上绘图。</p>
<p><strong>另一个相关问题:</strong></p>
<p>我可以像在 Mac 上的“Photo Booth”中那样一次显示 <strong>4 个相机 View </strong>吗？</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>您可以使用 AVFoundation 来做到这一点</p>
<pre><code>- (void)initCapture {
AVCaptureDeviceInput *captureInput = [AVCaptureDeviceInput
deviceInputWithDevice:
error:nil];
AVCaptureVideoDataOutput *captureOutput = [ init];
captureOutput.alwaysDiscardsLateVideoFrames = YES;
dispatch_queue_t queue;
queue = dispatch_queue_create("cameraQueue", NULL);
;
dispatch_release(queue);
NSString* key = (NSString*)kCVPixelBufferPixelFormatTypeKey;
NSNumber* value = ;
NSDictionary* videoSettings = ;
;
self.captureSession = [ init];
;
;
;
;
self.customLayer = ;
self.customLayer.frame =CGRectMake(5-25,25, 200,150);
self.customLayer.transform = CATransform3DRotate(CATransform3DIdentity, M_PI/2.0f, 0, 0, 1);
//self.customLayer.transform =CATransform3DMakeRotation(M_PI/2.0f, 0, 0, 1);
//;
//self.customLayer.frame =CGRectMake(0, 0, 200,150);
//self.customLayer.contentsGravity = kCAGravityResizeAspectFill;
;
//;
self.customLayer1 = ;
//self.customLayer.frame = self.view.bounds;
self.customLayer1.frame =CGRectMake(165-25, 25, 200, 150);
self.customLayer1.transform = CATransform3DRotate(CATransform3DIdentity, M_PI/2.0f, 0, 0, 1);
//self.customLayer1.contentsGravity = kCAGravityResizeAspectFill;
;
self.customLayer2 = ;
//self.customLayer.frame = self.view.bounds;
self.customLayer2.frame =CGRectMake(5-25, 210 +25, 200, 150);
self.customLayer2.transform = CATransform3DRotate(CATransform3DIdentity, M_PI/2.0f, 0, 0, 1);
//self.customLayer1.contentsGravity = kCAGravityResizeAspectFill;
;
self.customLayer3 = ;
//self.customLayer.frame = self.view.bounds;
self.customLayer3.frame =CGRectMake(165-25, 210 +25, 200, 150);
self.customLayer3.transform = CATransform3DRotate(CATransform3DIdentity, M_PI/2.0f, 0, 0, 1);
//self.customLayer1.contentsGravity = kCAGravityResizeAspectFill;
;
}
#pragma mark -
#pragma mark AVCaptureSession delegate
- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
fromConnection:(AVCaptureConnection *)connection
{
NSAutoreleasePool * pool = [ init];
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
/*Lock the image buffer*/
CVPixelBufferLockBaseAddress(imageBuffer,0);
/*Get information about the image*/
uint8_t *baseAddress = (uint8_t *)CVPixelBufferGetBaseAddress(imageBuffer);
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t height = CVPixelBufferGetHeight(imageBuffer);
/*Create a CGImageRef from the CVImageBufferRef*/
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef newContext = CGBitmapContextCreate(baseAddress, width, height, 8, bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
CGImageRef newImage2 = CGBitmapContextCreateImage(newContext);
/*We release some components*/
CGContextRelease(newContext);
CGColorSpaceRelease(colorSpace);
;
;
;
;
//UIImage *image= ;
/*We relase the CGImageRef*/
CGImageRelease(newImage2);
//;
/*We unlock theimage buffer*/
CVPixelBufferUnlockBaseAddress(imageBuffer,0);
;
}
</code></pre>
<p>效果很好..</p>
<p> <a href="http://crayoncoding.blogspot.com/2011/04/iphone-4-camera-views-at-once.html" rel="noreferrer noopener nofollow">http://crayoncoding.blogspot.com/2011/04/iphone-4-camera-views-at-once.html</a> </p>
<p>详细代码见以上链接</p></p>
<p style="font-size: 20px;">关于ios - iPhone 相机访问权限？，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/3558276/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/3558276/
</a>
</p>
页:
[1]