我有3张图片。我逐个加载到相机叠加图像。然后我需要拍摄快照。但是，当我点击按钮时，它会拍摄特定图像的快照。当我将imageName.png放入captureStillImageWithOverlay时，它仅拍摄该图像的快照，当叠加中存在时，它不会拍摄其他图像
按钮点击代码：
- (void)ButtonPressed {
[[self captureManager] captureStillImageWithOverlay:[UIImage imageNamed:@"img2.png"]];
}
加载图片：
-(void)loadNextPage:(int)index
{
int countFlag=0;
for(int i=index*4;i<(index+1)*4;i++)
{
UIButton *imageView=[[UIButton alloc]initWithFrame:CGRectMake((320*index)+countFlag*80+ 2, 5, 75, 75)];
imageView.tag=i+1;
[imageView addTarget:self action:@selector(imageViewClicked:) forControlEvents:UIControlEventTouchUpInside];
[imageView.layer setBorderColor:[UIColor lightGrayColor].CGColor];
[imageView.layer setBorderWidth:1.0f];
switch ((i+1)%5) {
case 0:
[imageView setImage:[UIImage imageNamed:@"img1.png"] forState:UIControlStateNormal];
break;
case 1:
[imageView setImage:[UIImage imageNamed:@"img2.png"] forState:UIControlStateNormal];
break;
case 2:
[imageView setImage:[UIImage imageNamed:@"img3.png"] forState:UIControlStateNormal];
break;
}
[myScrollView addSubview:imageView];
[imageView release];
countFlag++;
}
}
捕获叠加图像：
- (void)captureStillImageWithOverlay:(UIImage*)overlay
{
AVCaptureConnection *videoConnection = nil;
for (AVCaptureConnection *connection in [[self stillImageOutput] connections]) {
for (AVCaptureInputPort *port in [connection inputPorts]) {
if ([[port mediaType] isEqual:AVMediaTypeVideo]) {
videoConnection = connection;
break;
}
}
if (videoConnection) {
break;
}
}
NSLog(@"about to request a capture from: %@", [self stillImageOutput]);
[[self stillImageOutput] captureStillImageAsynchronouslyFromConnection:videoConnection
completionHandler:^(CMSampleBufferRef imageSampleBuffer, NSError *error) {
CFDictionaryRef exifAttachments = CMGetAttachment(imageSampleBuffer, kCGImagePropertyExifDictionary, NULL);
if (exifAttachments) {
NSLog(@"attachements: %@", exifAttachments);
} else {
NSLog(@"no attachments");
}
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
UIImage *image = [[UIImage alloc] initWithData:imageData];
CGSize imageSize = [image size];
CGSize overlaySize = [overlay size];
UIGraphicsBeginImageContext(imageSize);
[image drawInRect:CGRectMake(0, 0, imageSize.width, imageSize.height)];
CGFloat xScaleFactor = imageSize.width / 320;
CGFloat yScaleFactor = imageSize.height / 480;
[overlay drawInRect:CGRectMake(30 * xScaleFactor, 100 * yScaleFactor, overlaySize.width * xScaleFactor, overlaySize.height * yScaleFactor)]; // rect used in AROverlayViewController was (30,100,260,200)
UIImage *combinedImage = UIGraphicsGetImageFromCurrentImageContext();
[self setStillImage:combinedImage];
UIGraphicsEndImageContext();
[image release];
[[NSNotificationCenter defaultCenter] postNotificationName:kImageCapturedSuccessfully object:nil];
}];
}
答案 0 :(得分：2)
叠加层仅用于在相机选取器中显示。
您还需要在保存到磁盘的最终UIImage（JPEG或TIFF或其他）中组合这些图像。
Other people have had (and have solved) this same problem as you
编辑，这是可以帮助你的一些代码：
- (void)captureStillImageWithOverlay:(NSArray *) arrayOfImageFiles
{
AVCaptureConnection *videoConnection = nil;
for (AVCaptureConnection *connection in [[self stillImageOutput] connections]) {
for (AVCaptureInputPort *port in [connection inputPorts]) {
if ([[port mediaType] isEqual:AVMediaTypeVideo]) {
videoConnection = connection;
break;
}
}
if (videoConnection) {
break;
}
}
NSLog(@"about to request a capture from: %@", [self stillImageOutput]);
[[self stillImageOutput] captureStillImageAsynchronouslyFromConnection:videoConnection
completionHandler:^(CMSampleBufferRef imageSampleBuffer, NSError *error) {
CFDictionaryRef exifAttachments = CMGetAttachment(imageSampleBuffer, kCGImagePropertyExifDictionary, NULL);
if (exifAttachments) {
NSLog(@"attachements: %@", exifAttachments);
} else {
NSLog(@"no attachments");
}
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
UIImage *image = [[UIImage alloc] initWithData:imageData];
CGSize imageSize = [image size];
UIGraphicsBeginImageContext(imageSize);
[image drawInRect:CGRectMake(0, 0, imageSize.width, imageSize.height)];
CGFloat xScaleFactor = imageSize.width / 320;
CGFloat yScaleFactor = imageSize.height / 480;
for(NSString * imageFileName in arrayOfImageFiles)
{
// images named @"img1" or @"img1.png" should work
UIImage * overlay = [UIImage imageNamed: imageFileName];
if(overlay)
{
CGSize overlaySize = [overlay size];
[overlay drawInRect:CGRectMake(30 * xScaleFactor, 100 * yScaleFactor, overlaySize.width * xScaleFactor, overlaySize.height * yScaleFactor)]; // rect used in AROverlayViewController was (30,100,260,200)
} else {
NSLog( @"could not find an image named %@", imageFileName);
}
}
UIImage *combinedImage = UIGraphicsGetImageFromCurrentImageContext();
[self setStillImage:combinedImage];
UIGraphicsEndImageContext();
[image release];
[[NSNotificationCenter defaultCenter] postNotificationName:kImageCapturedSuccessfully object:nil];
}];
}