前置闪光灯亮度 iPhone
Front Flash Brightness iPhone
我已经在一个项目上工作了一段时间了,我想真正解决一件事,但我一直没弄明白。
在应用程序中拍摄前置照片时,我希望使用前置闪光灯让照片更亮。
我使用的是自定义 AVCaptureSession 摄像头,它是全屏的。这是使闪光发生的代码,只是图片一点也不亮。
//Here is the code for a front flash on the picture button press. It does flash, just doesn't help.
UIWindow* wnd = [UIApplication sharedApplication].keyWindow;
UIView *v = [[UIView alloc] initWithFrame: CGRectMake(0, 0, wnd.frame.size.width, wnd.frame.size.height)];
[wnd addSubview: v];
v.backgroundColor = [UIColor whiteColor];
[UIView beginAnimations: nil context: nil];
[UIView setAnimationDuration: 1.0];
v.alpha = 0.0f;
[UIView commitAnimations];
//imageView is just the actual view the the cameras image fills.
imageView.hidden = NO;
AVCaptureConnection *videoConnection = nil;
for (AVCaptureConnection *connection in stillImageOutput.connections) {
for(AVCaptureInputPort *port in [connection inputPorts]) {
if ([[port mediaType] isEqual:AVMediaTypeVideo]) {
videoConnection = connection;
break;
}
}if (videoConnection) {
break;
}
} [stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
if (imageDataSampleBuffer != NULL) {
imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
UIImage *thePicture = [UIImage imageWithData:imageData];
self.imageView.image = thePicture;
//After the picture is on the screen, I just make sure some buttons are supposed to be where they are supposed to be.
saveButtonOutlet.hidden = NO;
saveButtonOutlet.enabled = YES;
diaryEntryOutlet.hidden = YES;
diaryEntryOutlet.enabled = NO;
}
}];
}
抓图前需要设置白屏,等待抓图完成后再在completion block中去掉白屏。
您还应该在短暂延迟后发送捕获以确保屏幕变白 -
UIWindow* wnd = [UIApplication sharedApplication].keyWindow;
UIView *v = [[UIView alloc] initWithFrame: CGRectMake(0, 0, wnd.frame.size.width, wnd.frame.size.height)];
[wnd addSubview: v];
v.backgroundColor = [UIColor whiteColor];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
if (imageDataSampleBuffer != NULL) {
imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
UIImage *thePicture = [UIImage imageWithData:imageData];
dispatch_async(dispatch_get_main_queue(), ^{
self.imageView.image = thePicture;
[v removeFromSuperview];
});
}
//After the picture is on the screen, I just make sure some buttons are supposed to be where they are supposed to be.
saveButtonOutlet.hidden = NO;
saveButtonOutlet.enabled = YES;
diaryEntryOutlet.hidden = YES;
diaryEntryOutlet.enabled = NO;
}];
}];
我已经在一个项目上工作了一段时间了,我想真正解决一件事,但我一直没弄明白。
在应用程序中拍摄前置照片时,我希望使用前置闪光灯让照片更亮。
我使用的是自定义 AVCaptureSession 摄像头,它是全屏的。这是使闪光发生的代码,只是图片一点也不亮。
//Here is the code for a front flash on the picture button press. It does flash, just doesn't help.
UIWindow* wnd = [UIApplication sharedApplication].keyWindow;
UIView *v = [[UIView alloc] initWithFrame: CGRectMake(0, 0, wnd.frame.size.width, wnd.frame.size.height)];
[wnd addSubview: v];
v.backgroundColor = [UIColor whiteColor];
[UIView beginAnimations: nil context: nil];
[UIView setAnimationDuration: 1.0];
v.alpha = 0.0f;
[UIView commitAnimations];
//imageView is just the actual view the the cameras image fills.
imageView.hidden = NO;
AVCaptureConnection *videoConnection = nil;
for (AVCaptureConnection *connection in stillImageOutput.connections) {
for(AVCaptureInputPort *port in [connection inputPorts]) {
if ([[port mediaType] isEqual:AVMediaTypeVideo]) {
videoConnection = connection;
break;
}
}if (videoConnection) {
break;
}
} [stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
if (imageDataSampleBuffer != NULL) {
imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
UIImage *thePicture = [UIImage imageWithData:imageData];
self.imageView.image = thePicture;
//After the picture is on the screen, I just make sure some buttons are supposed to be where they are supposed to be.
saveButtonOutlet.hidden = NO;
saveButtonOutlet.enabled = YES;
diaryEntryOutlet.hidden = YES;
diaryEntryOutlet.enabled = NO;
}
}];
}
抓图前需要设置白屏,等待抓图完成后再在completion block中去掉白屏。
您还应该在短暂延迟后发送捕获以确保屏幕变白 -
UIWindow* wnd = [UIApplication sharedApplication].keyWindow;
UIView *v = [[UIView alloc] initWithFrame: CGRectMake(0, 0, wnd.frame.size.width, wnd.frame.size.height)];
[wnd addSubview: v];
v.backgroundColor = [UIColor whiteColor];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
if (imageDataSampleBuffer != NULL) {
imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
UIImage *thePicture = [UIImage imageWithData:imageData];
dispatch_async(dispatch_get_main_queue(), ^{
self.imageView.image = thePicture;
[v removeFromSuperview];
});
}
//After the picture is on the screen, I just make sure some buttons are supposed to be where they are supposed to be.
saveButtonOutlet.hidden = NO;
saveButtonOutlet.enabled = YES;
diaryEntryOutlet.hidden = YES;
diaryEntryOutlet.enabled = NO;
}];
}];